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Journal articles on the topic 'Slotted lasers'

Author: Grafiati

Published: 18 May 2024

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1

Fordyce, J. A. M., D. A. Diaz-Thomas, L. O'Faolain, A. N. Baranov, T. Piwonski, and L. Cerutti. "Single-mode interband cascade laser with a slotted waveguide." Applied Physics Letters 121, no. 21 (November 21, 2022): 211102. http://dx.doi.org/10.1063/5.0120460.

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The design of a single-mode interband cascade laser (ICL) using a slotted waveguide is presented. This technique was explored as an inexpensive alternative to distributed feedback lasers since standard photolithography can be used in fabrication and complex techniques, such as e-beam lithography, re-growth steps, and/or metal gratings, can be avoided. The design of slotted waveguides must be carefully simulated before fabrication to ensure the efficacy of the photolithography masks with each ICL growth. Limitations and the behavior of key design parameters are discussed. Single-mode emission was achieved for certain temperature and injected current conditions, validating the operation of an Sb based slotted laser. The slotted ICLs were emitting from a single longitudinal mode at 3.5 μm and 2 mW of power per facet output at 20 °C with threshold currents around 80 mA.

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2

Guo, Wei-Hua, Qiaoyin Lu, Marta Nawrocka, Azat Abdullaev, James O'Callaghan, Michael Lynch, Vincent Weldon, and John F. Donegan. "Integrable Slotted Single-Mode Lasers." IEEE Photonics Technology Letters 24, no. 8 (April 2012): 634–36. http://dx.doi.org/10.1109/lpt.2012.2184745.

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3

Wallace, M. J., Gaurav Jain, Robert Mckenna, Frank Bello, and J. F. Donegan. "Tuning behaviour of slotted vernier widely tunable lasers." Optics Express 27, no. 12 (June 4, 2019): 17122. http://dx.doi.org/10.1364/oe.27.017122.

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4

Wallace, M. J., R. O’Reilly Meehan, R. Enright, F. Bello, D. McCloskey, B. Barabadi, E. N. Wang, and J. F. Donegan. "Athermal operation of multi-section slotted tunable lasers." Optics Express 25, no. 13 (June 15, 2017): 14414. http://dx.doi.org/10.1364/oe.25.014414.

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5

Abdullaev, Azat, Qiaoyin Lu, Wei-Hua Guo, Marta Nawrocka, Frank Bello, James O'Callaghan, and John F. Donegan. "Linewidth Characterization of Integrable Slotted Single-Mode Lasers." IEEE Photonics Technology Letters 26, no. 22 (November 15, 2014): 2225–28. http://dx.doi.org/10.1109/lpt.2014.2350772.

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6

Jánossy, M., P. Mezei, P. Horváth, and L. Csillag. "Pulsed noble gas mixture slotted hollow cathode lasers." Optics Communications 68, no. 1 (September 1988): 58–62. http://dx.doi.org/10.1016/0030-4018(88)90014-4.

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7

Perrott, Alison, Ludovic Caro, Mohamad Dernaika, and Frank Peters. "A Comparison between off and On-Chip Injection Locking in a Photonic Integrated Circuit." Photonics 6, no. 4 (October 1, 2019): 103. http://dx.doi.org/10.3390/photonics6040103.

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The mutual and injection locking characteristics of two integrated lasers are compared, both on and off-chip. In this study, two integrated single facet slotted Fabry–Pérot lasers are utilised to develop the measurement technique used to examine the different operational regimes arising from optically locking a semiconductor diode laser. The technique employed used an optical spectrum analyser (OSA), an electrical spectrum analyser (ESA) and a high speed oscilloscope (HSO). The wavelengths of the lasers are measured on the OSA and the selected optical mode for locking is identified. The region of injection locking and various other regions of dynamical behaviour between the lasers are observed on the ESA. The time trace information of the system is obtained from the HSO and performing the FFT (Fast Fourier Transform) of the time traces returns the power spectra. Using these tools, the similarities and differences between off-chip injection locking with an isolator, and on-chip mutual locking are examined.

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8

Shan, Siyue. "The Versatile Applications of Distributed Bragg Reflector (DBR) Lasers: Sensing, Communication, And Beyond." Highlights in Science, Engineering and Technology 81 (January 26, 2024): 444–48. http://dx.doi.org/10.54097/tf7y5v82.

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Distributed Bragg Reflector (DBR) lasers have emerged as versatile and indispensable tools across various domains. Their advantages, including high signal-to-noise ratios, narrow linewidths, and support for distributed sensing, enable them to excel in diverse applications. DBR lasers have revolutionized optical fiber communication, medical diagnostics, and chaos-based key distribution. They provide precise control over wavelengths, making them valuable in fields such as dermatology, ophthalmology, and photodynamic therapy. Additionally, they play a critical role in flow cytometry, spectroscopy, and dental procedures. In the realm of sensing, DBR lasers have proven their efficacy in detecting parameters like temperature, pressure, current, magnetic fields, and ultrasound. Innovative techniques, such as FPGA-based demodulation and slotted DBR optical fiber lasers, have further enhanced their capabilities. As technology advances, the potential of DBR lasers in sensing and detection applications continues to grow. Their ability to deliver real-time, accurate data across various parameters positions them as essential tools for addressing complex scientific, medical, and industrial challenges. The future promises exciting developments in DBR laser technology, further expanding their role in solving multifaceted problems.

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9

Roy, Aritra, Saroj K. Patra, and Tomasz Piwonski. "Tunable Semiconductor Slotted Lasers for Near-Infrared Optical Coherence Tomography." IEEE Photonics Technology Letters 33, no. 16 (August 15, 2021): 896–99. http://dx.doi.org/10.1109/lpt.2021.3098418.

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10

Qiaoyin Lu, Wei-Hua Guo, Diarmuid Byrne, and John F. Donegan. "Design of Slotted Single-Mode Lasers Suitable for Photonic Integration." IEEE Photonics Technology Letters 22, no. 11 (June 2010): 787–89. http://dx.doi.org/10.1109/lpt.2010.2045888.

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11

Lu, Qiaoyin, Azat Abdullaev, Marta Nawrocka, Wei-Hua Guo, James O'Callaghan, and John F. Donegan. "Slotted Single Mode Lasers Integrated With a Semiconductor Optical Amplifier." IEEE Photonics Technology Letters 25, no. 6 (March 2013): 564–67. http://dx.doi.org/10.1109/lpt.2013.2245645.

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12

Mickus, Dovydas, Robert Mckenna, Caolan Murphy, and John F. Donegan. "Wide range thermal and athermal operation of slotted surface grating lasers." Optics Express 29, no. 11 (May 17, 2021): 16893. http://dx.doi.org/10.1364/oe.422978.

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13

Kavanagh, N., D. Goulding, and F. C. Garcia Gunning. "Stable injection locking with slotted Fabry–Perot lasers at 2 μm." Journal of Physics: Photonics 1, no. 1 (December 7, 2018): 015005. http://dx.doi.org/10.1088/2515-7647/aae7d9.

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14

Smyth, F., E. Connolly, B. Roycroft, B. Corbett, P. Lambkin, and L. P. Barry. "Fast Wavelength Switching Lasers Using Two-Section Slotted Fabry–PÉrot Structures." IEEE Photonics Technology Letters 18, no. 20 (October 2006): 2105–7. http://dx.doi.org/10.1109/lpt.2006.882319.

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15

Bouchene, Mohammed Mehdi, Rachid Hamdi, and Qin Zou. "Theorical analysis of a monolithic all-active three-section semiconductor laser." Photonics Letters of Poland 9, no. 4 (December 31, 2017): 131. http://dx.doi.org/10.4302/plp.v9i4.785.

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We propose a novel semiconductor laser structure. It is composed of three cascaded active sections: a Fabry-Pérot laser section sandwiched between two gain-coupled distributed feedback (DFB) laser sections. We have modeled this multi-section structure. The simulation results show that compared with index- and gain-coupled DFB lasers, a significant reduction in the longitudinal spatial-hole burning can be obtained with the proposed device, and that this leads to a stable single longitudinal mode operation at relatively high optical power with a SMSR exceeding 56dB. Full Text: PDF ReferencesL.A. Coldren, "Monolithic tunable diode lasers", IEEE J. Select. Topics Quant. Electron. 6, 988 (2000) CrossRef O. Kjebon, R. Schatz, S. Lourdudoss, S. Nilsson, B. Stalnacke, L. Backbom, "30 GHz direct modulation bandwidth in detuned loaded InGaAsP DBR lasers at 1.55 [micro sign]m wavelength", Electron. Lett. 33(6), 488 (1997). CrossRef N. Kim, J. Shin, E. Sim, C.W. Lee, D.-S. Yee, M.Y. Jeon, Y. Jang, K.H. Park, "Monolithic dual-mode distributed feedback semiconductor laser for tunable continuous-wave terahertz generation", Opt. Expr. 17(16), 13851 (2009). CrossRef M.J. Wallace, R. ORreilly Meehan, R.R Enright, F. Bello, D. Mccloskey, B. Barabadi, E.N. Wang, J.F. Donegan, "Athermal operation of multi-section slotted tunable lasers", Opt. Expr. 25(13), 14426 (2017). CrossRef J.E. Carroll, J.E.A. Whiteaway, R.G.S. Plumb, "Distributed Feedback Semiconductor Lasers", Distributed feedback semiconductor lasers (IEE and SPIE, 1998). CrossRef H. Ghafour-Shiraz, Distributed Feedback Laser Diodes and Optical Tunable Filters (Wiley, 2003). CrossRef D.D. Marcenac, Ph.D dissertation (University of Cambridge, 1993). DirectLink L.M. Zhang, J.E. Carroll, C. Tsang, "Dynamic response of the gain-coupled DFB laser", IEEE J. Quant. Electr. 29, 1722 (1993). CrossRef W. Li, W.-P. Huang, X. Li, J. Hong, "Multiwavelength gain-coupled DFB laser cascade: design modeling and simulation", IEEE J. Quant. Electro. 36(10), 1110 (2000). CrossRef B.M. Mehdi, H. Rachid, in Proc. 3rd Intern. Conf. on Embedded Systems in Telecomm. and Instrument., Annaba, Algeria (2016). DirectLinkC. Henry, "Theory of the linewidth of semiconductor lasers", IEEE J.Quant. Electr. QE-18, 259 (1982). CrossRef K. Takaki, T. Kise, K. Maruyama, N. Yamanaka, M. Funabashi, A. Kasukawa, "Reduced linewidth re-broadening by suppressing longitudinal spatial hole burning in high-power 1.55-/spl mu/m continuous-wave distributed-feedback (CW-DFB) laser diodes", IEEE J. Quant. Electr. 39, 1060 (2003) CrossRef

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16

Alexander, J. K., P. E. Morrissey, H. Yang, M. Yang, P. J. Marraccini, B. Corbett, and F. H. Peters. "Monolithically integrated low linewidth comb source using gain switched slotted Fabry-Perot lasers." Optics Express 24, no. 8 (April 5, 2016): 7960. http://dx.doi.org/10.1364/oe.24.007960.

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17

Gao, Zhuo, Jun Wang, Cong Xiong, Yuanyuan Liu, Suping Liu, and Xiaoyu Ma. "Improved spectral characteristics of 980 nm broad area slotted Fabry—Perot diode lasers." Journal of Semiconductors 33, no. 1 (January 2012): 014007. http://dx.doi.org/10.1088/1674-4926/33/1/014007.

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18

Shortiss, Kevin, Maryam Shayesteh, William Cotter, Alison Perrott, Mohamad Dernaika, and Frank Peters. "Mode Suppression in Injection Locked Multi-Mode and Single-Mode Lasers for Optical Demultiplexing." Photonics 6, no. 1 (March 8, 2019): 27. http://dx.doi.org/10.3390/photonics6010027.

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Optical injection locking has been demonstrated as an effective filter for optical communications. These optical filters have advantages over conventional passive filters, as they can be used on active material, allowing them to be monolithically integrated onto an optical circuit. We present an experimental and theoretical study of the optical suppression in injection locked Fabry–Pérot and slotted Fabry–Pérot lasers. We consider both single frequency and optical comb injection. Our model is then used to demonstrate that improving the Q factor of devices increases the suppression obtained when injecting optical combs. We show that increasing the Q factor while fixing the device pump rate relative to threshold causes the locking range of these demultiplexers to asymptotically approach a constant value.

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19

Mickus, Dovydas, Robert McKenna, Caolan Murphy, and John Donegan. "Multi-channel wide range athermal operation of slotted surface grating lasers for athermal DWDM." Optics Continuum 1, no. 2 (February 8, 2022): 345. http://dx.doi.org/10.1364/optcon.438281.

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20

Li, Mengke, Lijun Yuan, Hongyan Yu, Qiang Kan, Shiyan Li, Junping Mi, and Jiaoqing Pan. "Design and fabrication of 1.55 μm broad area slotted single-mode Fabry–Perot lasers." Journal of Semiconductors 37, no. 3 (March 2016): 034007. http://dx.doi.org/10.1088/1674-4926/37/3/034007.

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21

Morrissey, P. E., W. Cotter, D. Goulding, B. Kelleher, S. Osborne, H. Yang, J. O’Callaghan, B. Roycroft, B. Corbett, and F. H. Peters. "On-chip optical phase locking of single growth monolithically integrated slotted fabry perot lasers." Optics Express 21, no. 14 (July 12, 2013): 17315. http://dx.doi.org/10.1364/oe.21.017315.

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22

Lu, Q. Y., W. H. Guo, R. Phelan, D. Byrne, J. F. Donegan, P. Lambkin, and B. Corbett. "Analysis of Slot Characteristics in Slotted Single-Mode Semiconductor Lasers Using the 2-D Scattering Matrix Method." IEEE Photonics Technology Letters 18, no. 24 (December 2006): 2605–7. http://dx.doi.org/10.1109/lpt.2006.887328.

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23

Jialin Zhao, Kai Shi, Yonglin Yu, and L. P. Barry. "Theoretical Analysis of Tunable Three-Section Slotted Fabry–Perot Lasers Based on Time-Domain Traveling-Wave Model." IEEE Journal of Selected Topics in Quantum Electronics 19, no. 5 (September 2013): 1–8. http://dx.doi.org/10.1109/jstqe.2013.2251323.

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24

Sun, Wei, Gongyuan Zhao, Pengfei Zhang, Michael Wallace, Frank Bello, Qiaoyin Lu, Weihua Guo, and John F. Donegan. "Design of 1.3- $\mu \text{m}$ High-Performance Directly Modulated Lasers Based on High-Order Slotted Surface Gratings." IEEE Journal of Quantum Electronics 53, no. 5 (October 2017): 1–9. http://dx.doi.org/10.1109/jqe.2017.2730160.

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25

Wang, Guangdong, and Zhanghua Han. "Investigations on the optical forces from three mainstream optical resonances in all-dielectric nanostructure arrays." Beilstein Journal of Nanotechnology 14 (June 2, 2023): 674–82. http://dx.doi.org/10.3762/bjnano.14.53.

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Light can exert radiation pressure on any object it encounters, and the resulting optical force can be used to manipulate particles at the micro- or nanoscale. In this work, we present a detailed comparison through numerical simulations of the optical forces that can be exerted on polystyrene spheres of the same diameter. The spheres are placed within the confined fields of three optical resonances supported by all-dielectric nanostructure arrays, including toroidal dipole (TD), anapoles, and quasi-bound states in continuum (quasi-BIC) resonances. By elaborately designing the geometry of a slotted-disk array, three different resonances can be supported, which are verified by the multipole decomposition analysis of the scattering power spectrum. Our numerical results show that the quasi-BIC resonance can produce a larger optical gradient force, which is about three orders of magnitude higher than those generated from the other two resonances. The large contrast in the optical forces generated with these resonances is attributed to a higher electromagnetic field enhancement provided by the quasi-BIC. These results suggest that the quasi-BIC resonance is preferred when one employs all-dielectric nanostructure arrays for the trapping and manipulation of nanoparticles by optical forces. It is important to use low-power lasers to achieve efficient trapping and avoid any harmful heating effects.

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26

Nguyen, Van An, Van Dai Pham, Thi Hong Cam Hoang, Huu Thang Le, Thu Trang Hoang, Quang Minh Ngo, and Van Hoi Pham. "A quantitative analysis of the whispering-gallery-mode lasers in Er3+-doped silica glass microspheres towards integration in SOI slotted photonic crystal waveguides." Optics Communications 440 (June 2019): 14–20. http://dx.doi.org/10.1016/j.optcom.2019.01.011.

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27

Castilio, Daniela, Ana Paula Ribeiro do Vale Pedreira, Paulo Henrique Orlato Rossetti, Leylha Maria Nunes Rossetti, and Wellington Cardoso Bonachela. "The influence of screw type, alloy and cylinder position on the marginal fit of implant frameworks before and after laser welding." Journal of Applied Oral Science 14, no. 2 (April 2006): 77–81. http://dx.doi.org/10.1590/s1678-77572006000200003.

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Misfit at the abutment-prosthetic cylinder interface can cause loss of preload, leading to loosening or fracture of gold and titanium screws. OBJECTIVES: To evaluate the influence of screw type, alloy, and cylinder position on marginal fit of implant frameworks before and after laser welding. METHODS: After Estheticone-like abutments were screwed to the implants, thirty plastic prosthetic cylinders were mounted and waxed-up to fifteen cylindrical bars. Each specimen had three interconnected prosthetic components. Five specimens were one-piece cast in titanium and five in cobalt-chromium alloy. On each specimen, tests were conducted with hexagonal titanium and slotted gold screws separately, performing a total of thirty tested screws. Measurements at the interfaces were performed using an optical microscope with 5mm accuracy. After sectioning, specimens were laser welded and new measurements were obtained. Data were submitted to a four-way ANOVA and Tukey's multiple comparisons test (alpha=0.05). RESULTS: Slotted and hexagonal screws did not present significant differences regarding to the fit of cylinders cast in titanium, either in one-piece casting framework or after laser welding. When slotted and hexagonal screws were tested on the cobalt-chromium specimens, statistically significant differences were found for the one-piece casting condition, with the slotted screws presenting better fit (24.13µm) than the hexagonal screws (27.93 µm). Besides, no statistically significant differences were found after laser welding. CONCLUSIONS: 1) The use of different metal alloys do exert influence on the marginal fit, 2) The slotted and hexagonal screws play the exclusive role of fixing the prosthesis, and did not improve the fit of cylinders, and 3) cylinder position did not affect marginal fit values.

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28

Wang, H. Y., D. L. Bourell, and J. J. Beaman. "Laser polishing of silica slotted rods." Materials Science and Technology 19, no. 3 (March 2003): 382–87. http://dx.doi.org/10.1179/026708303225009760.

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29

Song, Kee Nam, and Soo Sung Kim. "Determination of Optimum LASER Welding Parameters and the Development of a LASER Welding Technique to Enhance the Lateral Impact Strength of a Spacer Grid Assembly for a PWR Fuel Assembly." Materials Science Forum 580-582 (June 2008): 147–50. http://dx.doi.org/10.4028/www.scientific.net/msf.580-582.147.

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A spacer grid assembly, which is an interconnected array of slotted grid straps welded at the intersections to form an egg crate structure, is one of the core structural components of the nuclear fuel assemblies of a Pressurized light Water Reactor (PWR). The spacer grid assembly is structurally required to have enough buckling strength under lateral loads so that the nuclear fuel rods are maintained in a coolable geometry, and that control rods are able to be inserted. The ability of a spacer grid assembly to resist lateral loads is usually characterized in terms of its dynamic and static crush strengths. Since the crush strengths of a spacer grid assembly are known to depend on the weld qualities at the intersections of the slotted grid straps, high-tech welding methods, such as a TIG welding, LASER beam welding or Electron beam welding method, have been used recently in the nuclear fuel manufacturing fields. In this study, to meet the above requirements, two kinds of researches were carried out. First, by adjusting the LASER beam welding parameters, an optimum welding combination of the LASER beam welding parameters was obtained for welding a spacer grid assembly. Second, a new LASER beam welding technique was proposed to obtain a longer weld line and a smaller weld bead size by tilting the LASER beam. The buckling strength of the spacer grid welded by the new LASER beam welding technique was enhanced by up to 30 % when compared to that by the conventional LASER beam welding method.

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30

Zhang, Yejin, Hailing Wang, Hongwei Qu, Siriguleng Zhang, and Wanhua Zheng. "Slotted Hybrid III–V/Silicon Single-Mode Laser." IEEE Photonics Technology Letters 25, no. 7 (April 2013): 655–58. http://dx.doi.org/10.1109/lpt.2013.2248082.

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31

Si Lizhong, 司立众. "Research on Slotted Verticality of Die-Board Laser Cutting." Laser & Optoelectronics Progress 48, no. 7 (2011): 071405. http://dx.doi.org/10.3788/lop48.071405.

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32

Pradhan, Akash Kumar, and Mrinal Sen. "An integrable all-silicon slotted photonic crystal Raman laser." Journal of Applied Physics 126, no. 23 (December 21, 2019): 233103. http://dx.doi.org/10.1063/1.5121230.

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33

Su, Yanmei, Yu Bi, Pengfei Wang, Jie Sun, Xiuyan Sun, Shuai Luo, Jiaoqing Pan, and Yejin Zhang. "Emitting direction tunable slotted laser array for Lidar applications." Optics Communications 462 (May 2020): 125277. http://dx.doi.org/10.1016/j.optcom.2020.125277.

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34

Guglielmotti, A., F. Quadrini, E. A. Squeo, and V. Tagliaferri. "Diode laser bending of tongues from slotted steel tubes." International Journal of Material Forming 2, no. 2 (February 10, 2009): 107–11. http://dx.doi.org/10.1007/s12289-009-0396-x.

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35

Eastwood, P. G., N. A. Halliwell, and P. Gilbert. "Laser Tools for Diesel Engine Diagnosis." Proceedings of the Institution of Mechanical Engineers, Part D: Transport Engineering 199, no. 4 (October 1985): 295–300. http://dx.doi.org/10.1243/pime_proc_1985_199_169_01.

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Two portable laser instruments are described which allow the engineer to simply ‘stand and point’ laser beams at a target surface in order to obtain a measurement of time-resolved vibration velocity. The first supplements the accelerometer and measures normal surface velocity but offers the advantage of non-contact measurement. Its use is demonstrated in detecting reduced nozzle pressures in fuel injectors. The second instrument is a laser torsional vibrometer which measures torsional oscillations of rotating machinery parts and in particular crankshaft oscillation. Comparisons are made with the more standard technique which utilizes a slotted disc. The new instrument provides advantages of non-contact measurement, insensitivity to shaft radial motion and the ability to measure oscillations of shafts of arbitrary cross-section.

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36

Hoang, Thi Hong Cam, Thanh Binh Pham, Thuy Van Nguyen, Van Dai Pham, Huy Bui, Van Hoi Pham, Elena Duran, et al. "Hybrid Integrated Nanophotonic Silicon-based Structures." Communications in Physics 29, no. 4 (December 16, 2019): 481. http://dx.doi.org/10.15625/0868-3166/29/4/13855.

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We report nanophotonic silicon-based devices for hybrid integration: 1D photonic crystal (PhC) on optical fiber, i. e. fiber Bragg grating (FBG) sensing probe integrated in fiber laser structure for chemical sensors and slotted planar 2D PhC cavity combined with carbon nanotube (CNT) towards light nanosources. The experiments have been carried out by integrating 1D PhC on optical fiber in fiber laser structure. This structure possesses many advantages including high resolution for wavelength shift, high optical signal-to-noise ratio (OSNR) of about 50~dB, the small full width at half-maximum (FWHM) of about 0.014~nm therefore its accuracy is enhanced, as well as the precision and capability are achieved for remote sensing. Low nitrate concentration in water from 0 to 80 ppm has been used to demonstrate its sensing ability in the experiment. The proposed sensor can work with good repeatability, rapid response, and its sensitivity can be obtained of \(3.2\times 10^{ - 3}\) nm/ppm with the limit of detection (LOD) of 3~ppm. For 2D PhC cavity, enhancement of photoluminescence of CNT emission is observed. The semiconducting single-walled carbon nanotubes (s-SWNTs) solution was prepared by polymer-sorted method and coupled with the confined modes in silicon slotted PhC cavities. The enhancement ratio of 1.15 is obtained by comparing between the PL peaks at two confined modes of the cavity. The PL enhancement result of the integrated system shows the potential for the realization of on-chip nanoscale sources.

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37

Mathews, I., A. Abdullaev, S. Lei, R. Enright, M. J. Wallace, and J. F. Donegan. "Reducing thermal crosstalk in ten-channel tunable slotted-laser arrays." Optics Express 23, no. 18 (August 27, 2015): 23380. http://dx.doi.org/10.1364/oe.23.023380.

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38

Song, Kee Nam, Soo Sung Kim, Soo Bum Lee, and Yong Wan Kim. "Development of a LASER Welding Apparatus and a Method for an Inner-Strap Welding of a Spacer Grid Assembly for a PWR Fuel Assembly." Materials Science Forum 580-582 (June 2008): 507–10. http://dx.doi.org/10.4028/www.scientific.net/msf.580-582.507.

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A spacer grid assembly, which is an interconnected array of slotted grid straps welded at the intersections to form an egg crate structure, is one of the core structural components for the nuclear fuel assemblies of a Pressurized light Water Reactor (PWR). The commercial spacer grid assembly is spot-welded at the crossing points of the intersections by a TIG welding, LASER beam welding or Electron beam welding method. In this study, a LASER beam welding apparatus and a method for an inner strap welding has been proposed to obtain a longer and finer weld line and a smaller weld bead size for a spacer grid assembly for a PWR fuel assembly. Also a rapid welding and excellent weld quality have been achieved by the proposed welding apparatus and method.

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39

Yang, Hua, Padraic Morrissey, William Cotter, Chris L. M. Daunt, James O'Callaghan, Brendan Roycroft, Nan Ye, Niall Kelly, Brian Corbett, and Frank H. Peters. "Monolithic Integration of Single Facet Slotted Laser, SOA, and MMI Coupler." IEEE Photonics Technology Letters 25, no. 3 (February 2013): 257–60. http://dx.doi.org/10.1109/lpt.2012.2233197.

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40

Bello, Frank, Qiao Yin Lu, Azat Abdullaev, Marta Nawrocka, and John F. Donegan. "Linewidth and Noise Characterization for a Partially-Slotted, Single Mode Laser." IEEE Journal of Quantum Electronics 50, no. 9 (September 2014): 1–5. http://dx.doi.org/10.1109/jqe.2014.2344043.

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41

Bello, Frank, Azat Abdullaev, Michael Wallace, Marta Nawrocka, Qiaoyin Lu, Weihua Guo, and John F. Donegan. "Traveling Wave Analysis for a High-Order Grating, Partially Slotted Laser." IEEE Journal of Quantum Electronics 51, no. 11 (November 2015): 1–5. http://dx.doi.org/10.1109/jqe.2015.2485219.

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42

Zhang, Yejin, Hongwei Qu, Hailing Wang, Siriguleng Zhang, Lei Liu, Shaodong Ma, and Wanhua Zheng. "A hybrid silicon single mode laser with a slotted feedback structure." Optics Express 21, no. 1 (January 9, 2013): 877. http://dx.doi.org/10.1364/oe.21.000877.

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43

Wang, Yin, Youguang Yang, Sen Zhang, Lei Wang, and Jian-Jun He. "Narrow Linewidth Single-Mode Slotted Fabry–Pérot Laser Using Deep Etched Trenches." IEEE Photonics Technology Letters 24, no. 14 (July 2012): 1233–35. http://dx.doi.org/10.1109/lpt.2012.2201711.

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44

Martin‐Guennou, Annaig, Yves Quéré, Eric Rius, Christian Person, Shaima Enouz‐Vedrenne, Guillaume Lesueur, and Thomas Merlet. "Direct metal laser sintering process investigation: application to 3D slotted waveguide antennas." IET Microwaves, Antennas & Propagation 11, no. 14 (September 14, 2017): 1921–29. http://dx.doi.org/10.1049/iet-map.2016.1060.

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45

Cotter, William, David Goulding, Brendan Roycroft, James O’Callaghan, Brian Corbett, and Frank H. Peters. "Investigation of active filter using injection-locked slotted Fabry–Perot semiconductor laser." Applied Optics 51, no. 30 (October 18, 2012): 7357. http://dx.doi.org/10.1364/ao.51.007357.

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46

Kelly, Niall P., Ludovic Caro, Mohamad Dernaika, and Frank H. Peters. "Regrowth-free integration of injection locked slotted laser with an electroabsorption modulator." Optics Express 25, no. 4 (February 14, 2017): 4054. http://dx.doi.org/10.1364/oe.25.004054.

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47

Browning, C., K. Shi, P. M. Anandarajah, R. Phelan, and L. P. Barry. "Direct modulation of a tuneable slotted Fabry-Pérot laser with adaptive modulation OFDM." Optics Express 20, no. 26 (November 30, 2012): B399. http://dx.doi.org/10.1364/oe.20.00b399.

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48

Xu, Yuanbo, Ting Fu, Jian Fan, Wenzhen Liu, Hongwei Qu, Mingjin Wang, and Wanhua Zheng. "High-Power Supersymmetric Semiconductor Laser with a Narrow Linewidth." Photonics 10, no. 3 (February 22, 2023): 238. http://dx.doi.org/10.3390/photonics10030238.

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Abstract:

We have designed and fabricated a kind of supersymmetric slotted Fabry–Perot semiconductor laser near 1550 nm to achieve a single-mode, high-power, and narrow-linewidth operation. The structure of the laser is composed of an electrically pumped broad ridge waveguide in the middle to provide optical gain, a group of periodic slots etched near the front facet to suppress the extra longitudinal modes and achieve a narrow linewidth, and a pair of passive superpartner waveguides located on both sides to filter out the high-order lateral modes in the broad waveguide. The device measured under the temperature of 25 °C shows an output power of 113 mW, a single-lobe lateral far-field distribution with the full width at half maximum of 7.8°, a peak wavelength of 1559.7 nm with the side-mode suppression ratio of 48.5 dB, and an intrinsic linewidth of 230 kHz at the bias current of 800 mA. The device is a promising candidate for cost-effective light sources for coherent communication systems and LiDARs.

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Gellér, Zsuzsa Edina, Katalin Albrecht, and János Dobránszky. "Electropolishing of Coronary Stents." Materials Science Forum 589 (June 2008): 367–72. http://dx.doi.org/10.4028/www.scientific.net/msf.589.367.

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Produce of coronary stents demands advanced precision. In the present study, electropolishing was performed on stainless steel slotted tube coronary stents made by laser cutting. The surface quality of stents has a significant influence on biocompatibility, therefore the optimal method for electropolishing were explored. Additionally, acid pickling as the pretreatment of electropolishing was also conducted. Pickling was necessary prior to electropolishing for decreasing roughness of the cutting zone and for removing the oxide films covering the stent surface. An optimal condition for electropolishing could also be established and it caused a smooth stent surface. Material removal (weight loss and strut width change) in the process of both pickling and electropolishing was investigated. Furthermore, material characterization of the stents was determined by means of composition analysis, metallographic characterization and microstructural analysis.

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Ren, Shi Ming, Dong Sheng Li, Chao Jiang, and Cheng Long Yu. "Research on the Combined Forming Process for Large Curvature Outdoor Antenna Reflector Elements." Applied Mechanics and Materials 365-366 (August 2013): 536–40. http://dx.doi.org/10.4028/www.scientific.net/amm.365-366.536.

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To solve the forming problems of the outdoor antenna reflector elements with large curvature continuous surface, the combined forming process (CFP) of stretch preforming and cemented postforming was proposed. The key technologies of CFP mainly included four technologies such as the building of a surface model, the creation of the process supplement surface (PSS), the setup of the three layers aluminum plates (TLAP) locating holes and the laser cutting process to shape the outer edge of the TLAP applied in the reconfigurable multi-point die (RMPD). These key technologies were systematically researched. The measurements of the reflector elements and comparative analysis between the three processes (CFP, slitted and slotted process) were given. The results showed that the CFP had an advantage in large curvature forming, high precision forming and continuous working surface forming.

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