Journal articles: 'Diamond laser'

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Oleynichuk E. A., Danilov P. A., Lednev V. N., Sdvizhenskii P. A., Kuznetsov M. S., Tarelkin S. A., Bondarenko M. G., and Khmelnitsky R. A. "Laser-induced luminescence of boron-doped synthetic diamond at various laser pulse durations." Optics and Spectroscopy 130, no. 4 (2022): 381. http://dx.doi.org/10.21883/eos.2022.04.53721.47-21.

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Excitation of type IIb synthetic diamond by ultrashort laser pulses in the visible range causes broadband luminescence in the UV visible range; the observed luminescence band can be attributed to the A band characteristic of diamonds. The photoluminescence spectra were obtained at different laser pulse durations (0.3-6.2 ps) depending on the pulse energy. A nonlinear dependence of the luminescence yield on the intensity of ultrashort pulses is established. Keywords: broadband luminescence, boron doped diamond, two-photon luminescence, A-band.

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Li, Zeng Qiang, Qi Wu, and Jun Wang. "Ultrashort Pulsed Laser Micromachining of Polycrystalline Diamond." Advanced Materials Research 497 (April 2012): 220–24. http://dx.doi.org/10.4028/www.scientific.net/amr.497.220.

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A femtosecond pulsed Nd:YAG laser was used to micromachine polycrystalline diamonds (PCD) and study the ablated microstructure characteristics under different irradiation parameters. With high laser intensity and low traverse speed, a micro cone with very smooth surface and clear edge can be obtained. There was almost no recast layer around the cone and no phase transition on the ablated surfaces was found. By contrast, the use of low laser intensity and high traverse speed could ablate only the grain boundaries without any damage to the diamond grits. These results suggest a need for further research in femtosecond laser micromachining of PCD for potential applications in fabricating new types of micro grinding wheels or diamond pencils.

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Wu, Qi, and Jun Wang. "Development in Laser Polishing of Polycrystalline Diamond Tools." Advanced Materials Research 135 (October 2010): 1–6. http://dx.doi.org/10.4028/www.scientific.net/amr.135.1.

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Laser polishing is a surface finishing technology for polycrystalline diamond (PCD) tools by removing uneven diamond particles from the diamond film through graphitization, melting and sublimation. While various types of lasers are used for the polishing of PCD tools, pulsed excimer and Nd: YAG lasers are among the most commonly used ones. The current development in laser polishing of PCD tools is reviewed. The reported experimental and modelling studies to improve the process performance are discussed. It reveals that there is a severe dearth of understanding of the process and the associated models for the efficient and effective use of the technology. The direction of future research in laser polishing is finally discussed.

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Khomich, Andrey A., Vitali Kononenko, Oleg Kudryavtsev, Evgeny Zavedeev, and Alexander V. Khomich. "Raman Study of the Diamond to Graphite Transition Induced by the Single Femtosecond Laser Pulse on the (111) Face." Nanomaterials 13, no. 1 (December 29, 2022): 162. http://dx.doi.org/10.3390/nano13010162.

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The use of the ultrafast pulse is the current trend in laser processing many materials, including diamonds. Recently, the orientation of the irradiated crystal face was shown to play a crucial role in the diamond to graphite transition process. Here, we develop this approach and explore the nanostructure of the sp2 phase, and the structural perfection of the graphite produced. The single pulse of the third harmonic of a Ti:sapphire laser (100 fs, 266 nm) was used to study the process of producing highly oriented graphite (HOG) layers on the (111) surface of a diamond monocrystal. The laser fluence dependence on ablated crater depth was analyzed, and three different regimes of laser-induced diamond graphitization are discussed, namely: nonablative graphitization, customary ablative graphitization, and bulk graphitization. The structure of the graphitized material was investigated by confocal Raman spectroscopy. A clear correlation was found between laser ablation regimes and sp2 phase structure. The main types of structural defects that disrupt the HOG formation both at low and high laser fluencies were determined by Raman spectroscopy. The patterns revealed give optimal laser fluence for the production of perfect graphite spots on the diamond surface.

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Minbaeva, B. D., and K. Khaidarov. "PHASE COMPOSITION AND STRUCTURE OF CARBONADO DIAMOND POLYCRYSTALS AFTER LASER TREATMENT." Herald of KSUCTA n a N Isanov, no. 2-2-2022 (April 30, 2022): 740–44. http://dx.doi.org/10.35803/1694-5298.2022.2.740-744.

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Synthetic polycrystalline diamonds are mainly composed of inclusions of graphite and a catalyst metal (Me). The presence of these inclusions and their amount significantly affects many of the physical and mechanical properties of diamonds and, ultimately, the performance of diamonds in a tool. Therefore, the study of the quantitative phase composition of synthetic diamonds (SD) is very important. The paper considers the change in the period of the crystal lattice of SD polycrystals and nickel (Ni) impurities after exposure to laser radiation with a wavelength of 1.06 μm. The time of laser irradiation varied from 3 to 60 sec. To determine the crystal lattice period of SA polycrystals, powders with a grain size of 315/250, 200/160, and 100/80 μm were used. A decrease in the crystal lattice period of the studied diamonds was found. We assume that this is due to the diffusion process of ordering of the diamond lattice, when the metal-enriched sections of the diamond-metal-catalyst system are locally heated. The results obtained will make it possible to understand the physical mechanism for increasing the strength of the studied crystals after exposure to laser beams under certain conditions.

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Spierings, Adriaan Bernardus, Christian Leinenbach, Christoph Kenel, and Konrad Wegener. "Processing of metal-diamond-composites using selective laser melting." Rapid Prototyping Journal 21, no. 2 (March 16, 2015): 130–36. http://dx.doi.org/10.1108/rpj-11-2014-0156.

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Purpose – The purpose of this paper is a feasibility study that was performed to investigate the basic processability of a diamond-containing metal matrix. Powder-bed-based additive manufacturing processes such as selective laser melting (SLM) offer a huge degree of freedom, both in terms of part design and material options. In that respect, mixtures of different powders can offer new ways for the manufacture of materials with tailored properties for special applications such as metal-based cutting or grinding tools with incorporated hard phases. Design/methodology/approach – A two-step approach was used to first investigate the basic SLM-processability of a Cu-Sn-Ti-Zr alloy, which is usually used for the active brazing of ceramics and superhard materials. After the identification of a suitable processing window, the processing parameters were then applied to a mixture of this matrix material with 10-20 volume per cent artificial, Ni-coated mono-crystalline diamonds. Findings – Even though the processing parameters were not yet optimized, stable specimens out of the matrix material could be produced. Also, diamond-containing mixtures with the matrix material resulted in stable specimens, where the diamonds survived the layer-wise build process with the successive heat input, as almost no graphitization was observed. The diamond particles are fully embedded in the Cu-Sn-Ti-Zr matrix material. The outer part of the diamonds partly dissolves in the matrix during the SLM process, forming small TiC particles and most likely a thin TiC layer around the diamond particles. Originality/value – The feasibility study approved the SLM processing capabilities of a metal-diamond composite. Although some cracking phenomena sill occur, this seems to be an interesting and promising way to create new abrasive tools with added value in terms of internal and local lubrication supply, tooling temperature control and improved tooling durability.

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Davanloo, F., E. M. Juengerman, D. R. Jander, T. J. Lee, and C. B. Collins. "Laser plasma diamond." Journal of Materials Research 5, no. 11 (November 1990): 2398–404. http://dx.doi.org/10.1557/jmr.1990.2398.

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Diamond-like films containing no hydrogen can be deposited from laser plasmas that are highly ionized. Growth rates of 0.5 μm/h over 100 cm2 areas have been realized on untreated substrates of a variety of materials including Si, Ge, ZnS, glass, and plastics. Measurements of optical properties and mass densities support the identification of this laser plasma diamond as a conglomerate of very fine grains of diamond polytypes in a matrix of other carbon forms.

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Lubbe, A. J. "Die optimisering van die snyproses van diamante met behulp van ’n YAG - laser." Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie 12, no. 4 (July 9, 1993): 83–88. http://dx.doi.org/10.4102/satnt.v12i4.569.

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A laser cannot, as generally assumed by the layman, cut right through a diamond with a single cut. A couple of hundred cuts may be necessary to "chip carve" through a diamond. There are several parameters, for example cutting speed, focus point, overlapping of cuts, etc., that influence the cutting process. With a view to optimizing the cutting process, laser cuts in diamonds were studied in a systematic way with the aid of an electron microscope. The method, technique and the results of the research are discussed in this article.

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Akesh Kumar, G., N. Prabavathy, and Laxmidhar Biswal. "Raman Photoluminescence - An Efficient way to distinguish Natural diamonds and Lab Grown diamonds." IOP Conference Series: Materials Science and Engineering 1225, no. 1 (February 1, 2022): 012023. http://dx.doi.org/10.1088/1757-899x/1225/1/012023.

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Abstract The advancements in Science and Technology introduced Lab grown diamonds (LGDs) that meet with diverse applications. The LGD’s possess similar electrical, optical and mechanical characteristics compared to natural diamonds mined from earth. There is a possibility of LGDs infiltration in the Natural diamond pipeline in the jewellery industry. Hence, it becomes crucial to detect LGDs. The present article illustrates the importance of Raman Photoluminescence over absorption spectroscopy and Fluorescence/Phosphorescence imaging for identification of diamond nature. In the current work, a single Laser source of 532 nm was used to obtain the distinct molecular information of Natural diamonds and Lab Grown diamonds.

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Kononenko, Vitali V., Maxim S. Komlenok, Pavel A. Chizhov, Vladimir V. Bukin, Vladislava V. Bulgakova, Andrey A. Khomich, Andrey P. Bolshakov, Vitaly I. Konov, and Sergey V. Garnov. "Efficiency of Photoconductive Terahertz Generation in Nitrogen-Doped Diamonds." Photonics 9, no. 1 (December 29, 2021): 18. http://dx.doi.org/10.3390/photonics9010018.

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The efficiency of the generation of terahertz radiation from nitrogen-doped (∼0.1–100 ppm) diamonds was investigated. The synthetic polycrystalline and monocrystalline diamond substrates were pumped by a 400 nm femtosecond laser and tested for the photoconductive emitter operation. The dependency of the emitted THz power on the intensity of the optical excitation was measured. The nitrogen concentrations of the diamonds involved were measured from the optical absorbance, which was found to crucially depend on the synthesis technique. The observed correlation between the doping level and the level of the performance of diamond-based antennas demonstrates the prospects of doped diamond as a material for highly efficient large-aperture photoconductive antennas.

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Pant, Anupum, Chaman Gupta, Katharina Senkalla, Greg Felsted, Xiaojing Xia, Tobias Spohn, Scott T. Dunham, Fedor Jelezko, and Peter J. Pauzauskie. "Reduced photothermal heating in diamonds enriched with H3 point defects." Journal of Applied Physics 131, no. 23 (June 21, 2022): 234401. http://dx.doi.org/10.1063/5.0090661.

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Solid-state laser refrigeration of semiconductors remains an outstanding experimental challenge. In this work, we show that, following excitation with a laser wavelength of 532 nm, bulk diamond crystals doped with H3 centers both emit efficient up-conversion (anti-Stokes) photoluminescence and also show significantly reduced photothermal heating relative to crystals doped with nitrogen–vacancy (NV) centers. The H3 center in diamond is a highly photostable defect that avoids bleaching at high laser irradiances of 10–70 MW/cm[Formula: see text] and has been shown to exhibit laser action, tunable over the visible band of 500–600 nm. The observed reduction of photothermal heating arises due to a decrease in the concentration of absorbing point defects, including NV-centers. These results encourage future exploration of techniques for H3 enrichment in diamonds under high-pressure, high-temperature conditions for the simultaneous anti-Stokes fluorescence cooling and radiation balanced lasing in semiconductor materials. Reducing photothermal heating in diamond through the formation of H3 centers also opens up new possibilities in quantum sensing via optically detected magnetic resonance spectroscopy at ambient conditions.

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Cui, Jianlei, Xuyang Fang, Xiangyang Dong, Xuesong Mei, Kaida Xu, Zhengjie Fan, Zheng Sun, and Wenjun Wang. "Fabrication of PCD Skiving Cutter by UV Nanosecond Laser." Materials 14, no. 14 (July 19, 2021): 4027. http://dx.doi.org/10.3390/ma14144027.

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Polycrystalline diamond (PCD) skiving cutter has dominated research in recent years. However, the traditional methods of fabrication have failed to cut the diamond with high quality. We propose the two-step laser machining process combining roughing machining with orthogonal irradiation and finishing machining with tangential irradiation. In addition, the processing effect and mechanism of different lasers on the diamond were investigated by a finite element analysis. It’s proved that the ultraviolet nanosecond laser is an excellent machining method for the processing of diamond. Furthermore, the effect of the processing parameters on the contour accuracy (Rt) was studied. The result indicates that the Rt value decreases first and then increases as the increase of the line interval, scanning speed and defocusing amount (no matter positive or negative defocus). Further, Raman spectroscopy was applied to characterize the diamond surface under different cutting methods and the flank face of the tool after processing. Finally, a high-quality PCD skiving cutter was obtained with an Rt of 5.6 µm and no phase transition damage.

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Yavuz, Nurperi, Mustafa Mert Bayer, Hüseyin Ozan Ҫirkinoğlu, Ali Serpengüzel, Thien Le Phu, Argyro Giakoumaki, Vibhav Bharadwaj, Roberta Ramponi, and Shane M. Eaton. "Laser-Inscribed Diamond Waveguide Resonantly Coupled to Diamond Microsphere." Molecules 25, no. 11 (June 10, 2020): 2698. http://dx.doi.org/10.3390/molecules25112698.

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An all-diamond photonic circuit was implemented by integrating a diamond microsphere with a femtosecond-laser-written bulk diamond waveguide. The near surface waveguide was fabricated by exploiting the Type II fabrication method to achieve stress-induced waveguiding. Transverse electrically and transverse magnetically polarized light from a tunable laser operating in the near-infrared region was injected into the diamond waveguide, which when coupled to the diamond microsphere showed whispering-gallery modes with a spacing of 0.33 nm and high-quality factors of 105. By carefully engineering these high-quality factor resonances, and further exploiting the properties of existing nitrogen-vacancy centers in diamond microspheres and diamond waveguides in such configurations, it should be possible to realize filtering, sensing and nonlinear optical applications in integrated diamond photonics.

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Podsiadło, Marcin, Lucyna Jaworska, and Piotr Klimczyk. "Direct brazing of diamond to the tool body – brazing binders and methods." Mechanik 92, no. 8-9 (September 9, 2019): 520–23. http://dx.doi.org/10.17814/mechanik.2019.8-9.63.

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The article presents the problem of direct brazing of diamond to the tool body. The greatest threats to the brazing joint were discussed: stress and poor wettability. Methods for producing polycrystalline diamond blanks by various methods were presented. The metal alloys (solders) with a silver, nickel and copper matrix that is used for brazing diamonds were described. The most commonly used brazing methods (resistance, induction, laser and infrared) were discussed.

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Wei, Chao, Yuping Ma, Yuan Han, Yao Zhang, Liu Yang, and Xuehui Chen. "Study on Femtosecond Laser Processing Characteristics of Nano-Crystalline CVD Diamond Coating." Applied Sciences 9, no. 20 (October 12, 2019): 4273. http://dx.doi.org/10.3390/app9204273.

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Ultra-short pulse laser interaction with diamond materials has attracted extensive interest in micro- and nano-machining, especially for the fabrication of micro tools, because of the straightforward method and high precision. Thanks to the development of chemical vapor deposition (CVD) technology, high-quality CVD diamonds are employed in more varieties of tools as performance-enhancing coatings. The purpose of the experiments reported here was to explore the machinability of CVD diamond coating under the irradiation of femtosecond (fs) pulsed laser. The factor-control approach was adopted to investigate the influence of scanning speed, single pulse energy and repetition rate on the surface quality and carbon phase transition of CVD diamond coating. The material removal rate and surface roughness were evaluated. The interaction mechanism of scanning speed, single pulse energy, and repetition rate were discussed, and the fs laser ablation threshold of CVD diamond coating was calculated. It was demonstrated that two ablation mechanisms (weak and intensive) were in existence as evidenced by the distinct surface morphologies induced under different processing conditions. A strong dependence on the variation of scanning speed and pulse energy is identified in the examination of surface roughness and removal rate. Lorentzian–Gaussian deconvolution of Raman spectra illustrates that fs laser irradiation yields a strong modification effect on the coating and release the compressive stress in it. Furthermore, a newly defined parameter referring to the fs laser energies applied to unit volume was introduced to depict the degree of ablation and the Taguchi method was used to figure out the significance of different parameters. The ablation threshold of CVD diamond coating at the effective pulses of 90 is calculated to be 0.138 J/cm2.

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Coccia, Giulio, Argyro N. Giakoumaki, Vibhav Bharadwaj, Ottavia Jedrkiewicz, Roberta Ramponi, and Shane M. Eaton. "Femtosecond laser writing of integrated photonic circuits in diamond." EPJ Web of Conferences 255 (2021): 12006. http://dx.doi.org/10.1051/epjconf/202125512006.

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Integrated photonic circuits pave the way for next generation technologies for quantum information and sensing applications. Femtosecond laser writing has emerged as a valuable technique for fabricating such devices when combined with diamond’s properties and its nitrogen vacancy color center. Such color centers are fundamental for sensing applications, being possible to excite them and read them out optically through the fabrication of optical waveguides in the bulk of diamond. We show how to integrate these building blocks in diamond, to develop proof-of-concept devices with unprecedented electric and magnetic field sensitivities.

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Deng, Qi Lin, An Ning Xie, K. K. Sun, G. C. Zhou, and Jian Li Song. "Researches on Dressing Diamond Grinding Wheels on Line by a Diamond Pen Aided with Laser Beam Preheating Based on Optical Fiber Delivering." Key Engineering Materials 304-305 (February 2006): 109–12. http://dx.doi.org/10.4028/www.scientific.net/kem.304-305.109.

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The dressing on line of diamond grinding wheels used in NC optical curve grinding machines are very difficult. A method has been researched in this paper that is dressing the diamond grinding wheels by a diamond pen aided with laser beam preheating . Its principle has been stated. The temperature mathematics model of laser beam preheating diamond grinding wheels has been set up. The temperature field of resin substrate diamond grinding wheels has been calculated. Through the analyses on the results of the temperature field, it has been known that the distance between laser beam preheating central and the diamond pen dressing point be very small. A new method that is delived laser beam by optical fiber in dressing on line of diamond grinding wheels by a diamond pen aided with laser beam preheating has be proposed. Uasing this new method, a high precision and high efficiency in dressing diamond grinding wheels on line can be fulfiled.

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Zuiker, Christopher D., Dieter M. Gruen, and Alan R. Krauss. "Laser-Reflectance Interferometry Measurements of Diamond-Film Growth." MRS Bulletin 20, no. 5 (May 1995): 29–31. http://dx.doi.org/10.1557/s0883769400044869.

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The remarkable properties of diamond, including its hardness, chemical inertness, high thermal conductivity, low coefficient of friction, optical transparency, and semiconducting properties, have led to considerable research in the area of diamond thin-film deposition. Diamond films have been characterized ex situ by a large number of diagnostic techniques including Raman spectroscopy, x-ray diffraction, SEM, and TEM. In situ diagnostics, which can provide information in real time as the film is growing, are less common.Laser-reflectance interferometry (LRI) has been used to monitor the growth of diamond films in situ. The technique involves measuring the intensity of a laser beam reflected from the substrate surface on which the film is growing. The reflected beam is the sum of beams reflected by the gas-diamond interface and the diamond-silicon interface. Oscillations in the reflectivity are observed as the film grows because of interference between the reflected beams. Each oscillation indicates an increase in film thickness of λ/2n, where λ is the laser wavelength and n is the index of refraction of the film. If the index of refraction of the film is known, the thickness and growth rate can be determined in situ. For LRI measurements with 632.8-nm-wavelength HeNe lasers, the index of refraction of diamond films has been found to be within 10% of the bulk diamond value of 2.4. Each oscillation therefore indicates an increase in film thickness of 0.13 μm.The reflectivity measured by LRI is also affected by scattering because of surface roughness.

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Tsai, Hung Yin, Chia Jen Ting, Kei Lin Kuo, and Chang Pin Chou. "Feasibility Study on UV YAG Laser Patterning on Diamond Film." Key Engineering Materials 364-366 (December 2007): 613–17. http://dx.doi.org/10.4028/www.scientific.net/kem.364-366.613.

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The laser ablation technique is one option for micro-machining and patterning of diamond film. A UV YAG laser with higher energy density can remove or destroy the diamond film more efficiently than the excimer laser. That is, the UV YAG laser not only provides faster etching rate on the diamond film, but also requires less processing and maintenance cost. In the current study, synthetic diamond films with grain size of 30 μm were deposited on silicon substrate by microwave plasma enhanced chemical vapor deposition (MPCVD) in the CH4/H2 mixture atmosphere. A pulsed UV YAG laser (λ = 355 nm, 10 kHz) was employed to machine and remove the diamond film. The diamond film surface was analyzed by SEM and Raman spectroscopy after the laser machining. The beam size of YAG laser was adjusted to between 0.1 mm and 1.5 mm by the trepan mechanism to approach the following defined scanning width. In order to shape a 4-inch diamond wafer into a microstructure, the scanning width of the UV YAG laser was defined to 0.1 mm, 0.75 mm and to 1.5 mm in several loops. The results show that the laser-polishing effect can be applied to the pretreatment of mechanical polishing of diamond wafer in the condition of 0.75 mm scanning width in 3 loops. From Raman spectrum, it could prove the mechanism of carbon burning reaction during the laser processing and the residual carbon existing in the laser-patterned area. The surface of diamond film is strongly affected by the laser processing and a better result from the parameter of 0.75 mm scanning width in 3 loops is shown in the current study.

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Tian, Fei, Hong Yang, Yong Guang Zhao, and Hong Mei Cao. "Size Effect on the Transformation from Graphite to Nanodiamonds." Materials Science Forum 787 (April 2014): 412–18. http://dx.doi.org/10.4028/www.scientific.net/msf.787.412.

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The synthesis of nanodiamonds by pulsed-laser ablation in liquid (PLAL) is an attractive research field in developing well-dispersed fluorescent nanodiamonds for bioimaging and life science. However, nanodiamonds are quite different from their widely pursued carbon allotropes both in synthesis conditions and physical properties. It is a great challenge to synthesize metastable phase nanodiamonds that prefer high temperature and high pressure. Despite the progress in the synthesis of nanodiamond by pulsed-laser ablation of graphite target using different laser power densities under room conditions, the transformation from graphite to nanodiamonds are not yet well explained. In order to have a better understanding to the formation of metastable nanodiamonds upon PLAL, the formation of nanodiamond has been elucidated from both the aspects of thermodynamics and kinetics. Due to low laser intensity and long wavelength, synthesis of nanodiamonds is the result of high cooling velocity of high-pressure and high-temperature carbon vapor condensation formed under laser vaporization of graphite particles. When diamond nuclei grow into the right size, they cannot increase and the graphite nucleation begins to form and grow on the diamond at given conditions due to long pulse width for ms-pulsed laser. In fact, the diamond particles enwrapped several layers of graphite have obtained. Moreover, the reasons related 3~6nm diamonds prepared by this new process and having narrow size distribution are also discussed.

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Fork, Richard, Wesley Walker, Rustin Laycock, Jason Green, and Spencer Cole. "Integrated diamond sapphire laser." Optics Express 11, no. 20 (October 6, 2003): 2532. http://dx.doi.org/10.1364/oe.11.002532.

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Reilly, Sean, Vasili G. Savitski, Hangyu Liu, Erdan Gu, Martin D. Dawson, and Alan J. Kemp. "Monolithic diamond Raman laser." Optics Letters 40, no. 6 (March 5, 2015): 930. http://dx.doi.org/10.1364/ol.40.000930.

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Xiong, Fulin, Y. Y. Wang, V. Leppert, and R. P. H. Chang. "Pulsed laser deposition of amorphous diamond-like carbon films with ArF (193 nm) excimer laser." Journal of Materials Research 8, no. 9 (September 1993): 2265–72. http://dx.doi.org/10.1557/jmr.1993.2265.

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We have deposited hydrogen-free diamond-like amorphous carbon films by ArF (193 nm) pulsed laser ablation of graphite. The deposition process is performed with a laser power density of only 5 × 108 W/cm2 at room temperature without any auxiliary energy source incorporation. The resulting films possess remarkable physical, optical, and mechanical properties that are close to those of diamond and distinct from the graphite target used. The films have a mechanical hardness up to 38 GPa, an optical energy band gap of 2.6 eV, and excellent thermal stability. Analysis of electron energy loss spectroscopy reveals the domination of diamond-type tetrahedral bonding structure in the films with the sp3 bond fraction over 95%. Compared with other reported results of pulsed-laser-deposited diamond-like carbon films, our experimental results confirm that the laser wavelength or photon energy plays a crucial role in controlling the properties of the pulsed-laser-deposited diamond-like carbon films.

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Cai, Song, Wenhao Liu, Jinchao Song, Kai Deng, and Yinghong Tang. "Research and Progress on Truing and Sharpening Process of Diamond Abrasive Grinding Tools." Applied Sciences 12, no. 9 (May 6, 2022): 4683. http://dx.doi.org/10.3390/app12094683.

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With respect to the truing and sharpening of diamond abrasive grinding tools, traditional machining methods are briefly described, and new dressing methods, such as the laser dressing method, are described in detail. It is pointed out that laser dressing of diamond abrasive tools is a green processing method with high efficiency and no environmental pollution. Numerical simulation research on pulse laser dressing of a bronze diamond abrasive grinding wheel was carried out, and a cumulative heat transfer model of laser dressing energy was developed. The temperature evolution law of the bronze bond and diamond abrasive grains dressed by pulsed fiber laser was determined by numerical analysis of the model. An experiment on the laser dressing grinding wheel was carried out; it was found that when the laser power density was 2.52 × 108 W/cm2~3.36 × 108 W/cm2, the bronze bond materials could be properly removed, and the diamond abrasive grains could be better sharpened. The laser dressing method can achieve the combination of diamond abrasive grinding tool sharpening and truing. The experiment not only demonstrated the correctness and feasibility of the theoretical model but also provided process optimization for research into pulse laser dressing of diamond abrasive grinding tools.

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Ageev, V. P., V. Yu Armeyev, N. I. Chapliev, A. V. Kuzmichov, S. M. Pimenov, and V. G. Ralchenko. "LASER PROCESSING OF DIAMOND AND DIAMOND-LIKE FILMS." Materials and Manufacturing Processes 8, no. 1 (January 1993): 1–8. http://dx.doi.org/10.1080/10426919308934810.

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Liu, Xiaoxu, Osamu Konda, Hiroko Furuhashi, Kohei Natsume, Satoru Maegawa, and Fumihiro Itoigawa. "Development of High-Performance Polycrystalline CVD Diamond-Coated Cutting Tools Using Femtosecond Lasers." International Journal of Automation Technology 15, no. 4 (July 5, 2021): 413–21. http://dx.doi.org/10.20965/ijat.2021.p0413.

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Pulse laser grinding (PLG), an edge-shaping process, was developed previously to implement high-performance cutting tools. In this study, two femtosecond (fs) lasers with wavelengths of 1045 nm and 257 nm were used to conduct PLG on chemical vapor deposited (CVD) diamond-coated tool edges, as the fs laser is reported to have less thermal impact and the potential to improve the material crystallinity. We investigated the effects of the laser parameters on the tool edge formation and microstructural changes. The results show that although the infrared fs laser could – compared to the conventional nanosecond (ns)-laser PLG – naturally suppress surface thermal damage, the roughness of the processed surface remained relatively high with an Rz of 0.21 μm. However, under the optimal laser parameters proposed in this paper, an ultraviolet fs-laser PLG was used to obtain a much smoother edge, reducing Rz to approximately 0.08 μm. Moreover, scanning electron microscopy images indicated that the longitudinal machining marks on the ns-laser-processed surface were significantly reduced, with virtually no attached debris on the surface. Furthermore, from the Raman spectra, a significant increase in the diamond peak intensity was observed, indicating that the crystallinity of the CVD diamond (CVDD) was improved following ultraviolet-fs-laser PLG. These results demonstrate that edge shaping and structural modification of polycrystalline CVDDs can be integrated into ultraviolet-fs-laser PLG.

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Rabiey, Mohammad, C. Dold, R. Transchel, and K. Wegener. "Influence of Picosecond Laser Touch Dressing of Electroplated Diamond Wheels on the Dressing of SiC Vitrified Bond Wheel." Advanced Materials Research 325 (August 2011): 189–94. http://dx.doi.org/10.4028/www.scientific.net/amr.325.189.

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Touch dressing of electroplated diamond wheels is a challenging technique used for precision form grinding. This paper presents an investigation to explore the capabilities of modern laser technology for touch dressing. A pulsed picosecond laser (ps-laser) beam (Yb:YAG) is used to cut diamond grains within a definite grain protrusion without noticeable thermal damage neither on the nickel bond material nor the diamond itself. A systematic study on laser irradiation parameters on cutting quality is presented. Series of experiments by dressing of SiC wheels using an ultrashort pulsed laser source as well as conventional touch dressed diamond wheel are carried out and both methods are compared. Significant advantages of the novel laser method are presented.

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Олейничук, Е. А., П. А. Данилов, В. Н. Леднев, П. А. Сдвиженский, М. С. Кузнецов, С. А. Тарелкин, М. Г. Бондаренко, and Р. А. Хмельницкий. "Лазерно-индуцированная люминесценция синтетического алмаза, легированного бором, при различной длительности лазерного импульса." Оптика и спектроскопия 130, no. 4 (2022): 477. http://dx.doi.org/10.21883/os.2022.04.52258.47-21.

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Excitation of type IIb synthetic diamond by ultrashort laser pulses in the visible range causes broadband luminescence in the UV visible range; the observed luminescence band can be attributed to the A band characteristic of diamonds. The photoluminescence spectra were obtained at different laser pulse durations (0.3–6.2 ps) depending on the pulse energy. A nonlinear dependence of the luminescence yield on the intensity of ultrashort pulses is established.

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29

Jiang, Tong, Si Gao, Zhennan Tian, Hanzhuang Zhang, and Ligang Niu. "Fabrication of diamond ultra-fine structures by femtosecond laser." Chinese Optics Letters 18, no. 10 (2020): 101402. http://dx.doi.org/10.3788/col202018.101402.

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30

Celii, F. G., H. H. Nelson, and P. E. Pehrsson. "The effects of UV laser irradiation on the filament-assisted deposition of diamond." Journal of Materials Research 5, no. 11 (November 1990): 2337–44. http://dx.doi.org/10.1557/jmr.1990.2337.

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The effects of 193 and 308 nm excimer laser radiation on the filament-assisted chemical vapor deposition (CVD) of diamond were investigated, in attempts to reproduce and quantify the reported mechanism of laser-enhanced diamond deposition. The deposited materials were analyzed using optical microscopy, SEM, scanning Auger microprobe, and micro-Raman scattering. With fluence levels of >50 mJ · cm−2, UV laser irradiation was found to suppress rather than enhance the quantity of diamond deposition. The size, morphology, and Raman spectra of crystallites in the irradiated regions were nearly identical to those in adjacent unirradiated regions of the same sample. An additional laser-induced effect was a region of enhanced etching on the Si substrate, which appeared as a “shadowing” of the diamond crystallites. The results are interpreted in terms of a laser-induced depletion of diamond nucleation sites, and suggest a new method for patterning of CVD films.

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31

Wang, Haijiang, Wei Zhang, Yingbo Peng, Mingyang Zhang, Shuyu Liu, and Yong Liu. "Microstructures and Wear Resistance of FeCoCrNi-Mo High Entropy Alloy/Diamond Composite Coatings by High Speed Laser Cladding." Coatings 10, no. 3 (March 24, 2020): 300. http://dx.doi.org/10.3390/coatings10030300.

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FeCoCrNi-Mo high entropy alloy/diamond composite coatings were successfully prepared by high speed laser cladding. A high scanning speed was adopted (>30 mm/s), and the effects of laser power, scanning speed, and diamond content on the microstructure and wear resistance of the composite coating were studied. The processing parameters of laser cladding had significant influence on the dilution ratio, graphitization of diamond, and wear resistance of the composite coatings. When the laser cladding parameters were 3000 W of laser power and the high scanning speed of 50 mm/s, the composite coating exhibited a uniform microstructure, the lowest dilution ratio, and the best wear resistance. The wear resistance of the composite coating was enhanced with the addition of diamond, but microcracks also increased. When the amount of diamond was 15 wt.%, the best combination of microstructures and wear resistance was obtained.

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32

Wu, X. J., Feng Xu, Dun Wen Zuo, Wen Zhuang Lu, and M. Wang. "Parameters Optimization of Laser Processing CVD Diamond Film Based on FEM Simulation." Key Engineering Materials 426-427 (January 2010): 26–29. http://dx.doi.org/10.4028/www.scientific.net/kem.426-427.26.

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Chemical vapor deposited (CVD) diamond film has a series of outstanding properties. However, it can not be easily machined by conventional technologies available currently for its high hardness and stability. Laser processing diamond film method can be an efficient way to process diamond film because of its high energy density. The mechanisms of laser processing diamond film are thermal oxidation, graphitization and evaporative ablation of graphite. Temperature distribution is of great importance to understand these complex phenomena taking place during the process because different temperatures lead to different physical and chemical changes of diamond. In this paper, the finite element method (FEM) software ANSYS is applied to calculate the temperature distribution. The relation between etching depth and laser machining parameters (laser power and scanning speed) is presented. The proper parameter ranges of laser power and scanning speed for a certain etching depth is also investigated with this method.

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33

Wu, Lijuan, Gang Zhang, Bo Li, Weilin Wang, Xuanjie Huang, Zhijun Chen, Gang Dong, Qunli Zhang, and Jianhua Yao. "Study on Microstructure and Tribological Performance of Diamond/Cu Composite Coating via Supersonic Laser Deposition." Coatings 10, no. 3 (March 17, 2020): 276. http://dx.doi.org/10.3390/coatings10030276.

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The supersonic laser deposition (SLD) of diamond/Cu composite powder is studied over a range of laser power. The deposition efficiency, coating microstructure, cohesive/adhesive bonding, phase composition, micro-hardness, and tribological property of the diamond/Cu composite coating are investigated. The results indicate that, as laser power is increased, deposition efficiency initially increases and then declines. The diamond particles distribute uniformly in the composite coating. Due to the increase of velocity ratio and total energy by laser irradiation, the cohesive/adhesive bonding of the composite coating is improved. The composite coating can preserve the phase composition of the origin powders due to the relatively low heat input during the SLD process. Slight oxidation of the Cu powder can be detected in the coatings prepared with high laser power, which has adverse effects on material deposition. The SLD-diamond/Cu composite coating has superior wear-resistance because of low friction coefficient, high micro-hardness, and uniformly distributed diamond particles.

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34

Chen, Hui, Zhenxu Bai, Xuezong Yang, Jie Ding, Yaoyao Qi, Bingzheng Yan, Yulei Wang, Zhiwei Lu, and Richard P. Mildren. "Enhanced stimulated Brillouin scattering utilizing Raman conversion in diamond." Applied Physics Letters 120, no. 18 (May 2, 2022): 181103. http://dx.doi.org/10.1063/5.0087092.

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Cascaded Brillouin lasers based on guided-wave structures are applied across a range of important fields such as optical communications, microwave photonics, and sensing. However, restricted by the volume and available transmission range of the gain medium, the power output and wavelength diversity of guided-wave Brillouin devices are somewhat limited. In this work, we report the design and development of a cascaded Brillouin laser based utilizing a free-space optical layout with a diamond crystal as the Brillouin gain medium. A quasi-continuous-wave, 1 μm laser was used as the pump laser, and Raman wavelength conversion is used as an intermediate process to facilitate stimulated Brillouin scattering with a low threshold. When the output transmission of the diamond cavity is 0.37% and the incident pump power is 220 W, cascading of the Brillouin–Stokes field to the eighth Stokes and the seventh anti-Stokes orders was observed. By adjusting the cavity length, the order of the cascaded Brillouin laser output is controlled. A comprehensive analysis of the Brillouin generation process and the cascade of Stokes orders is undertaken for different incident pump powers and cavity lengths. This work is expected to enable practical applications of high-power Brillouin lasers and Brillouin frequency combs.

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35

Bai, Zhenxu, Zhanpeng Zhang, Kun Wang, Jia Gao, Zhendong Zhang, Xuezong Yang, Yulei Wang, Zhiwei Lu, and Richard P. Mildren. "Comprehensive Thermal Analysis of Diamond in a High-Power Raman Cavity Based on FVM-FEM Coupled Method." Nanomaterials 11, no. 6 (June 15, 2021): 1572. http://dx.doi.org/10.3390/nano11061572.

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Despite their extremely high thermal conductivity and low thermal expansion coefficients, thermal effects in diamond are still observed in high-power diamond Raman lasers, which proposes a challenge to their power scaling. Here, the dynamics of temperature gradient and stress distribution in the diamond are numerically simulated under different pump conditions. With a pump radius of 100 μm and an absorption power of up to 200 W (corresponding to the output power in kilowatt level), the establishment period of thermal steady-state in a millimeter diamond is only 50 μs, with the overall thermal-induced deformation of the diamond being less than 2.5 μm. The relationship between the deformation of diamond and the stability of the Raman cavity is also studied. These results provide a method to better optimize the diamond Raman laser performance at output powers up to kilowatt-level.

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36

Komlenok, Maxim, Vladimir Pashinin, Vadim Sedov, and Vitaly Konov. "Femtosecond and nanosecond laser polishing of rough polycrystalline diamond." Laser Physics 32, no. 8 (June 15, 2022): 084003. http://dx.doi.org/10.1088/1555-6611/ac732c.

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Abstract The laser polishing of rough (roughness of 5 μm) diamond plate using femtosecond and nanosecond pulses was realized for the first time. The effect of the angle of incidence, the number of passes, scanning speed, and laser fluence on the surface roughness was investigated and the optimal conditions were found. The initial roughness of the diamond plate was reduced by 5 times from 5 to 1 μm for both femtosecond and nanosecond laser sources. The results indicate the prospects of laser polishing of rough polycrystalline diamond samples.

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37

Sun, Yuxiang, Muye Li, Richard Paul Mildren, Zhenxu Bai, Hongchao Zhang, Jian Lu, Yan Feng, and Xuezong Yang. "High-power continuous-wave single-frequency diamond Raman laser at 1178 nm." Applied Physics Letters 121, no. 14 (October 3, 2022): 141104. http://dx.doi.org/10.1063/5.0107200.

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We demonstrate a continuous-wave single-frequency diamond Raman laser operating at 1178 nm by using a linear resonator that is stabilized using an intracavity [Formula: see text] element. Optimization of the single-frequency power was realized by tuning the phase matching in the [Formula: see text] element away from the second-harmonic peak to suppress neighboring modes via sum frequency generation but avoid large losses to the intracavity primary Stokes mode. A maximum single-longitudinal-mode power of 20 W at 1178 nm with an instrument-limited linewidth of 67 MHz was obtained using a 12 GHz multi-longitudinal-mode Yb-doped fiber pump laser at 1018 nm with power of 82 W. This work provides an interesting route for producing single-frequency high-power lasers near 1.2 μm utilizing diamond Raman conversion combined with broadband, high-power, low-cost YDF lasers.

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38

Strek, W., M. Oleszko, O. Wiewiórski, R. Tomala, A. Konovalova, O. Ignatenko, and M. Chaika. "Laser induced white emission of diamond." Journal of Chemical Physics 157, no. 13 (October 7, 2022): 134708. http://dx.doi.org/10.1063/5.0116642.

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Laser-induced white emission of diamond was investigated under irradiation with a focused beam of an infrared laser diode. It is a surface-related coherent emission, characterized by an excitation threshold and an exponential dependence on pumping laser power. The mechanism of white emission is discussed in terms of multiphoton ionization of carbon atoms in an irradiated spot. The excitation power dependence of white emission intensity has demonstrated hysteresis loop behavior. This phenomenon could be useful in new broadband laser sources and optical information storage.

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39

Alabdulkarim, Mohamad E., Wendy D. Maxwell, Vibhor Thapliyal, and James L. Maxwell. "A Comprehensive Review of High-Pressure Laser-Induced Materials Processing, Part I: Laser-Heated Diamond Anvil Cells." Journal of Manufacturing and Materials Processing 6, no. 5 (September 29, 2022): 111. http://dx.doi.org/10.3390/jmmp6050111.

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Laser-heated diamond anvil cell (LH-DAC) experimentation has emerged as a leading technique for materials processing at extreme pressures and temperatures. LH-DAC systems are often employed to better characterise the structure and properties of materials in applications ranging from condensed matter physics to geophysical research to planetary science. This article reviews LH-DAC and related laser-based characterisation, as the first part of a series within the broader context of all high-pressure laser-induced material processing. In part I of this review, a synopsis of laser-heated diamond anvil cell experimental methods, developmental history, fundamental physicochemical processes, and emerging research trends are provided. Important examples of minerals/materials modified during LH-DAC investigations (since their inception) are also tabulated, including key phase transformations, material syntheses, laser parameters, and process conditions—as a reference for the reader and as a guide for directing future research efforts. Note that laser-dynamic-compression within diamond anvil cells (LDC-DAC experimentation) and laser-induced reactive chemical synthesis within diamond anvil cells (LRS-DAC experimentation) are treated separately, as Parts II and III of this review.

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40

Chlouba, Tomas, Roy Shiloh, Pontus Forsberg, Mathias Hamberg, Mikael Karlsson, Martin Kozák, and Peter Hommelhoff. "Diamond-based dielectric laser acceleration." Optics Express 30, no. 1 (December 22, 2021): 505. http://dx.doi.org/10.1364/oe.442752.

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41

Yang, Xuezong, Ondrej Kitzler, David J. Spence, Zhenxu Bai, Yan Feng, and Richard P. Mildren. "Diamond sodium guide star laser." Optics Letters 45, no. 7 (March 20, 2020): 1898. http://dx.doi.org/10.1364/ol.387879.

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42

Granados, Eduardo, David J. Spence, and Richard P. Mildren. "Deep ultraviolet diamond Raman laser." Optics Express 19, no. 11 (May 19, 2011): 10857. http://dx.doi.org/10.1364/oe.19.010857.

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43

Mildren, R. P., and A. Sabella. "Highly efficient diamond Raman laser." Optics Letters 34, no. 18 (September 10, 2009): 2811. http://dx.doi.org/10.1364/ol.34.002811.

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44

Lubeigt, Walter, Gerald M. Bonner, Jennifer E. Hastie, Martin D. Dawson, David Burns, and Alan J. Kemp. "Continuous-wave diamond Raman laser." Optics Letters 35, no. 17 (August 27, 2010): 2994. http://dx.doi.org/10.1364/ol.35.002994.

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45

Narayan, J., and X. Chen. "Laser patterning of diamond films." Journal of Applied Physics 71, no. 8 (April 15, 1992): 3795–801. http://dx.doi.org/10.1063/1.350892.

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46

Li, Yuqi, Zhenxu Bai, Hui Chen, Duo Jin, Xuezong Yang, Yaoyao Qi, Jie Ding, Yulei Wang, and Zhiwei Lu. "Eye-safe diamond Raman laser." Results in Physics 16 (March 2020): 102853. http://dx.doi.org/10.1016/j.rinp.2019.102853.

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47

O'Brien, L. C., R. L. Kubicek, and J. J. O'Brien. "Laser Raman Spectroscopy of Diamond." Journal of Chemical Education 71, no. 9 (September 1994): 759. http://dx.doi.org/10.1021/ed071p759.

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48

Bolshakov, A. P., V. I. Konov, A. M. Prokhorov, S. A. Uglov, and F. Dausinger. "Laser plasma CVD diamond reactor." Diamond and Related Materials 10, no. 9-10 (September 2001): 1559–64. http://dx.doi.org/10.1016/s0925-9635(01)00408-3.

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49

Ascarelli, P., E. Cappelli, S. Orlando, and F. Pinzari. "Laser treatment of diamond films." Applied Surface Science 127-129 (May 1998): 837–42. http://dx.doi.org/10.1016/s0169-4332(97)00752-6.

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50

Pimenov, S. M., V. V. Kononenko, V. G. Ralchenko, V. I. Konov, S. Gloor, W. Lüthy, H. P. Weber, and A. V. Khomich. "Laser polishing of diamond plates." Applied Physics A: Materials Science & Processing 69, no. 1 (July 1, 1999): 81–88. http://dx.doi.org/10.1007/s003390050975.

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Journal articles on the topic 'Diamond laser'

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