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Journal articles on the topic 'Lasers à fibres'

Author: Grafiati

Published: 25 January 2025

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1

Hennings, T., D. Hennings, and C. Lindsay. "Thrombus formation using endovenous lasers: an in vitro experiment." Phlebology: The Journal of Venous Disease 29, no. 3 (May 6, 2013): 171–78. http://dx.doi.org/10.1177/0268355512473921.

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Objectives: The purpose of these experiments was to simulate thrombus formation during endovenous laser closure by measuring coagulum formation of in vitro laser exposures in porcine blood and investigate the role of procedures and equipment in thrombus formation. Methods: Continuous wave 810, 940, 980, 1310 and 1470 nm lasers and microsecond pulsed wave 1064 nm Nd:YAG (neodymium-doped yttrium aluminium garnet), 1320 nm Nd:YAG and 2100 nm THC:YAG (thulium holmium chromium-doped yttrium aluminium garnet) lasers were tested with standard fibres with diameters of 365, 550 and 600 μm as well as two prototype modified tip fibres. Results: The results show that pulsed lasers with high-peak power densities form less coagulum. Fibre specifications were found not to influence coagulum formation, and prototype modified tip fibres designed to prevent contact between the fibre tip and the vein wall did not eliminate coagulum formation. Conclusion: Microsecond-pulsed wave lasers with high-peak power densities may be a better choice to minimize soft thrombus formation during endovenous laser ablation treatments.

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2

Popov, S. M., O. V. Butov, A. O. Kolosovskii, V. V. Voloshin, I. L. Vorob’ev, V. A. Isaev, D. V. Ryakhovskii, et al. "Optical fibres with an inscribed fibre Bragg grating array for sensor systems and random lasers." Quantum Electronics 51, no. 12 (December 1, 2021): 1101–6. http://dx.doi.org/10.1070/qel17659.

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Abstract We report the latest results on inscribing extended fibre Bragg grating (FBG) arrays upon fibre drawing, obtained at the Kotelnikov Institute of Radioengineering and Electronics of RAS. The properties of these structures are considered, and examples of their application in sensor systems of microwave dense wavelength multiplexing and as a basis for designing single-frequency fibre lasers are considered. The optical and laser characteristics of FBG arrays, inscribed (using 248-nm UV laser radiation) both in standard single-mode telecommunication fibres of the SMF-28 type and in erbium-doped active fibres, are investigated.

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3

He, Wentao, and Zhiwei Men. "Analysis on Transmission Characteristics of Stimulated Raman Scattering Based on the Multi-Sensor Signal Enhancement Technique." Scientific Programming 2022 (May 11, 2022): 1–9. http://dx.doi.org/10.1155/2022/5726718.

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In recent 20 years, fibre laser system has been developed rapidly and widely used for its high quality, high efficiency, high robustness, and compactness. However, there are still many factors (such as non-linear effect, thermal effect, and mode instability) that limit the further increase of power of fibre laser system. Stimulated Raman scattering (SRS) is one of the main limitations in the transmission process of fibre lasers. It not only reduces the output efficiency of fibre lasers, but also increases the damage risk of reverse Stokes light to the system. Recent studies have shown that SRS in low-mode fibres can lead to quasi-static mode degradation in addition to mode instability. With the introduction of multi-sensor enhancement technology in the fibre field, it becomes an effective means to popularise high-power and high-beam quality fibre lasers. Based on the multi-sensor signal enhancement technology, this paper explores the influence of this technology on the output efficiency of SRS in the mode-reducing fibre laser, which provides a new idea and method for the output efficiency and transmission analysis method of fibre laser.

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4

Provino, Laurent, Achille Monteville, David Landais, Olivier Le Goffic, Adil Haboucha, Thiery Taunay, and David Mechin. "Les fibres microstructurées : 20 ans d’existence et un vaste éventail d’applications." Photoniques, no. 99 (November 2019): 40–44. http://dx.doi.org/10.1051/photon/20199940.

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Les fibres optiques microstructurées, également appelées fibres à trous ou fibres optiques à cristal photonique sont un type récent de guides de lumières originaux et performants apparues dans le milieu des années 1990. Elles se sont depuis imposées comme une technologie incontournable de la photonique moderne. L’originalité première de ce genre de fibre a été de permettre le guidage de la lumière dans un matériau unique grâce à leur structuration périodique. Après une vingtaine d’années de recherche, la gamme possible de structures de ces fibres optiques s’est grandement étoffée, donnant lieu à plusieurs catégories de fibres microstructurées classifiées par type de mécanisme de guidage (par réflexion totale interne, par bande interdite photonique, et par couplage inhibé). Arrivées à maturité aujourd’hui, ces fibres optiques ont démontré au fil des années un potentiel d’applications extrêmement vaste et ce, dans des domaines très variés allant de la défense aux applications biophotoniques, sous la forme de capteurs optiques ou de lasers fibrés de forte puissance.

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5

McCaffer, C. J., L. Pabla, and C. Watson. "Curved adjustable fibre-optic diode laser in microscopic cholesteatoma surgery: description of use and review of the relevant literature." Journal of Laryngology & Otology 132, no. 4 (March 8, 2018): 360–63. http://dx.doi.org/10.1017/s0022215118000117.

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AbstractObjective:The use of lasers in cholesteatoma surgery is common and well accepted. The most commonly used laser fibres are straight and non-adjustable; these have several limitations. This paper describes the use of an alternative laser fibre.Method:This ‘How I Do It’ paper describes and illustrates the use of an alternative curved adjustable fibre-optic diode laser in microscopic cholesteatoma surgery.Results:The curved, adjustable laser fibre allows accurate and atraumatic disease removal when the use of a straight laser fibre may be less effective or accurate. It reduces potential damage to delicate structures without the need for extra drilling or bone removal.Conclusion:It is suggested that the curved adjustable laser fibre is superior to the traditional straight fibre for cholesteatoma surgery.

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6

Canning, John, Nathaniel Groothoff, Kevin Cook, Cicero Martelli, Alexandre Pohl, John Holdsworth, Somnath Bandyopadhyay, and Michael Stevenson. "Gratings in Structured Optical Fibres." Laser Chemistry 2008 (December 1, 2008): 1–19. http://dx.doi.org/10.1155/2008/239417.

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Grating writing in structured optical fibres and their properties and applications are reviewed. To date, most gratings have been written in a straightforward manner into structured fibres containing a photosensitive germanosilicate step-index core. However, gratings have also been written directly into single material, structured silica fibres and into air-clad cores using two and higher-photon processes with both UV and near IR pulsed (nanosecond-femtosecond) light. Given the intrinsic-added functionality possible within a structured optical fibre, structured fibre gratings offer further capabilities for sensors, diagnostics, lasers, and devices.

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7

Ivanenko, A. V., B. N. Nyushkov, and S. V. Smirnov. "Generation of high-energy single pulses and pulse clusters in ytterbium fibre lasers with quasi-synchronous modulation of the pump power." Quantum Electronics 51, no. 12 (December 1, 2021): 1061–67. http://dx.doi.org/10.1070/qel17653.

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Abstract Additional capabilities of the method of quasi-synchronous pump power modulation developed by the authors for nanosecond high-energy pulsed oscillation of fibre lasers with a long-lived (about 1 ms) upper laser level are investigated. Using an Yb fibre laser as an example, it is shown that quasi-synchronous pump power modulation makes it possible to generate not only a periodic sequence of single nanosecond pulses, but also regular pulse clusters with a controlled number of nanosecond subpulses that make up a cluster. In addition, the feasibility of scaling the energy of laser pulses obtained by the method of quasi-synchronous modulation of the pump power is studied when proceeding to the use of active double-clad fibres and higher-power multimode pump sources. Pulses with energies up to 430 nJ are obtained in a laser configuration maintaining linear polarisation of radiation. The results obtained significantly expand the possibilities of applying the method of quasi-synchronous modulation of the pump power in conventional fibre lasers based on stimulated emission.

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8

Dianov, Evgenii M., Igor' A. Bufetov, V. M. Mashinsky, Aleksei V. Shubin, O. I. Medvedkov, A. E. Rakitin, Mikhail A. Mel'kumov, V. F. Khopin, and A. N. Gur'yanov. "Raman fibre lasers based on heavily GeO2-doped fibres." Quantum Electronics 35, no. 5 (May 31, 2005): 435–41. http://dx.doi.org/10.1070/qe2005v035n05abeh003415.

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9

Gambling, W. Alex. "Optical fibres, lasers, and amplifiers." Endeavour 16, no. 1 (January 1992): 17–22. http://dx.doi.org/10.1016/0160-9327(92)90112-3.

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10

Leconte, Baptiste, Laurent Bigot, Philippe Roy, Raphael Jamier, Romain Dauliat, Marie-Alicia Malleville, Yves Quiquempois, Hicham El Hamzaoui, and Olivier Vanvincq. "Lasers de forte puissance : vers l’avènement de fibres optiques à aire effective extrême." Photoniques, no. 99 (November 2019): 23–27. http://dx.doi.org/10.1051/photon/20199923.

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Les systèmes lasers fibrés sont au coeur de nombreuses recherches académiques et constituent un marché annuel mondial dépassant le milliard d’euros. L’augmentation de la puissance en sortie de ces dispositifs a été rendue possible grâce à une innovation permanente portant sur la géométrie de fibres, les matériaux qui les constituent et les méthodes de synthèse associées. Après un bref rappel historique, nous rappelons quelques éléments de contexte et présentons quelques avancées récentes en matière de fibres à très grandes aires effectives.

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11

Kaur, Maj Summerdeep, Lt Col Sonali Sharma, and Maj Pankaj Awasthi. "CLINICAL EVALUATION OF EFFECTS OF LOW-LEVEL LASERS ON PAIN DURING CAVITY PREPARATION." International Journal of Research -GRANTHAALAYAH 6, no. 10 (October 31, 2018): 81–86. http://dx.doi.org/10.29121/granthaalayah.v6.i10.2018.1164.

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Aim: To study the effects of low level laser on pain during cavity preparation. Background: Laser irradiation stabilizes the nerve membrane through an increase in adenosine triphosphate (ATP) production and enhanced redox system of the cell. Dental pulp is innervated by non- myelinated C fibres. Laser irradiation reduces the conduction of Ad and C fibres (small diameter fibres), both of which transmit nociceptive pain. The stabilization of the nerve membrane increases neural latency and decreases pain transmission. This study explores whether pre-irradiation with laser reduces pain perception during cavity preparation. Methodology: A clinical study was done on 50 patients reporting to Army Dental Centre(R&R) having moderate and deep size carious lesions on first/second premolar’s bilaterally. The patients selected was apprehensive. On one side, low level lasers irradiation was done prior cavity preparation (Test). On the other contralateral tooth type cavity preparation was done without local anesthesia (Control). The patients pain threshold was noted for both control and test groups using Visual Analogue Scale (VAS). The data was computed and statiscally analyzed. Results: The patients exhibited reduce pain perception in tooth which had prior laser irradiation as compared to the control group. Conclusion: Laser analgesia with low level lasers can be used as routine protocol for reducing pain perception in apprehensive patients undergoing cavity preparation.

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12

Krylov, A. A., A. V. Gladyshev, A. K. Senatorov, A. N. Kolyadin, A. F. Kosolapov, M. M. Khudyakov, M. E. Likhachev, and I. A. Bufetov. "1.56-to-2.84 μm SRS conversion of chirped pulses of a high-power erbium fibre laser in a methane-filled hollow-core revolver fibre." Quantum Electronics 52, no. 3 (March 1, 2022): 274–77. http://dx.doi.org/10.1070/qel18003.

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Abstract Single-cascade 1.56-to-2.84 μm SRS conversion is demonstrated in a hollow-core revolver fibre filled with methane at a pressure of 25 atm under pumping by positively chirped pulses of a high-power erbium-doped all-fibre laser. At a maximum pump pulse energy of 34 μJ (average power 3.74 W) and a pump pulse duration of about 260 ps, ultrashort pulses (USPs) with a duration of 110 ps and an energy of 1.33 μJ (average power 133 mW) are achieved at the centre wavelength of 2.84 μm. The gas fibre Raman lasers based on hollow-core fibres with pumping by high-power fibre sources are promising for producing all-fibre systems emitting USPs in the mid-IR range.

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13

Barinaga, Marcia. "Advances in superconducting fibres using lasers." Nature 333, no. 6170 (May 1988): 200. http://dx.doi.org/10.1038/333200b0.

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14

Marszalec, Elzbieta, and Janusz Marszalec. "Lasers and optical fibres in robotics." Industrial Robot: An International Journal 17, no. 3 (March 1990): 149–53. http://dx.doi.org/10.1108/eb005100.

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15

Macfarlane, Roger. "Fluoride fibres yield blue-green lasers." Physics World 4, no. 10 (October 1991): 18. http://dx.doi.org/10.1088/2058-7058/4/10/22.

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16

Beck, Th, N. Reng, and H. Weber. "Optical fibres for material processing lasers." Optics and Lasers in Engineering 34, no. 4-6 (October 2000): 255–72. http://dx.doi.org/10.1016/s0143-8166(00)00081-6.

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17

Mills, Tim N. "Lasers and optical fibres in medicine." Lasers in Medical Science 9, no. 3 (September 1994): 207. http://dx.doi.org/10.1007/bf02590225.

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18

Young, E., A. Mitchell-Innes, and M. Jindal. "Lasers in stapes surgery: a review." Journal of Laryngology & Otology 129, no. 7 (June 10, 2015): 627–33. http://dx.doi.org/10.1017/s0022215115001280.

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AbstractBackground:Lasers in stapes surgery are used to divide the anterior and posterior crus of the stapes, divide the stapedius tendon and perforate the footplate. The ideal laser should not penetrate deeply into the perilymph (thereby increasing its temperature). It should be conducted through optical fibres, allowing easy manipulation, and should have good water absorption, equating to high bone ablation efficiency.Objectives:This review discusses the various different lasers used in stapes surgery with regard to their properties and suitability for this type of surgery. In particular, the laser parameters used are discussed to facilitate their clinical use.

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19

Kumar, Hardik, Tanya Jain, Mritunjay Sharma, and Kamal Kishor. "Neural network approach for faster optical properties predictions for different PCF designs." Journal of Physics: Conference Series 2070, no. 1 (November 1, 2021): 012001. http://dx.doi.org/10.1088/1742-6596/2070/1/012001.

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Abstract Photonic Crystal Fibres (PCFs) are emerging as an alternative to standard fibres for applications in many disciplines like fibre lasers & amplifiers, imaging, spectroscopy and telecommunications. They have superior light guiding properties compared to ordinary Optical Fibres (OFs). This paper illustrates the potential of neural networks to efficiently and accurately compute the optical properties of PCFs including solid-core, hollow-core and multi-core designs. The proposed method takes a range of design parameters and wavelengths as input to predict PCF optical properties like effective index, effective mode area, confinement loss and dispersion desired for optimal specifications. The neural network approach is significantly better in terms of the low computational runtimes (~5 milli-sec) required for predicting the properties against the longer runtimes (~18 sec) required for similar calculations by traditional numerical methods.

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20

Rass, K. "Current clinical evidence on endovenous laser ablation (EVLA) from randomised trials." Phlebologie 45, no. 04 (July 2016): 201–6. http://dx.doi.org/10.12687/phleb2317-4-2016.

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SummaryBackground Endovenous laser ablation (EVLA) is globally counted among the most frequently administered methods to treat saphenous vein incompetence. Technical development proceeded in three particular steps: EVLA #1 – Diode lasers linearly emitting wavelengths from 810 to 980 nm through optical bare fibres; EVLA #2 – Diode or Nd:YAG lasers emitting wavelengths from 1064 to 1500 nm; EVLA #3 – Modified optical fibres warranting an optimised emission geometry by centralisation of the fibre tip (Tulip-fibre, Jacket-tip) or radial emission of the laser beam. Due to the number of different EVLA techniques their value compared with standard surgery (high ligation and stripping, HLS) and other endovascular approaches has to be questioned.Methods Selective literature analysis based on a systematic PubMed search focussed on randomised controlled trials (RCT) comparing EVLA with HLS and other thermal or nonthermal ablation techniques – radiofrequency ablation (RFA), ultrasound guided foam sclerotherapy (UGFS), endothermal steam ablation (EStA).Results The search terms “endovenous”, “laser”, “varicose vein” resulted in 509 publications, hereof 57 RCTs, hereof 24 randomised studies comparing EVLA with other treatment approaches: 15 studies comprise comparisons with standard surgery and further 9 studies with other endovenous techniques. 6 RCTs contain long-term followup data on EVLA #1 vs. HLS suggesting superiority of HLS in terms of same site clinical and duplex detected recurrence from the groin. 15 RCTs are reporting short-term results clearly demonstrating inferiority of EVLA #1 against EVLA #2, EVLA #3, and RFA with respect to postoperative complaints and patients’ quality of life.Conclusions The first generation endovenous laser systems are disadvantageous or even harmful as compared with more advanced EVLA techniques and RFA in terms of patients’ complaints and side effects. Furthermore, evidence is rising that EVLA #1 is inferior to standard surgery regarding long-term treatment efficacy. Therefore, the application of EVLA #1 in the treatment of saphenous vein incompetence cannot be recommended any longer. In view of the more recently published RCTs reporting long-term superiority of standard surgery, HLS should still be implemented as control group in studies investigating endovenous treatment approaches.

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21

Roy, Philippe, Philippe Leproux, Sébastien Février, Dominique Pagnoux, Jean-Louis Auguste, Jean-Marc Blondy, Stéphane Hilaire, et al. "Photonic crystal fibres for lasers and amplifiers." Comptes Rendus Physique 7, no. 2 (March 2006): 224–32. http://dx.doi.org/10.1016/j.crhy.2006.01.018.

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22

Żmojda, Jacek, Piotr Miluski, Marcin Kochanowicz, Jan Dorosz, Agata Baranowska, Magdalena Leśniak, and Dominik Dorosz. "Luminescent properties of active optical fibers." Photonics Letters of Poland 11, no. 2 (July 1, 2019): 50. http://dx.doi.org/10.4302/plp.v11i2.908.

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Luminescent optical fibres are one of the most important photonics elements as they allow to construct high power fibre lasers and different unique optical sources in the broad range from UV to IR. The most important requirements cover efficient luminescence core materials and easily pumped optical fibre constructions. Depends on the applications the variety of optical fibres have been proposed based on glasses and polymers. In the paper some recent constructions developed in Bialystok Photonics Group have been shown. Full Text: PDF ReferencesA. Zajac, D. Dorosz, M. Kochanowicz, M. Skórczakowski, J. Świderski, "Fibre lasers - conditioning constructional and technological", Bull. Pol. Ac.: Tech. 58, 4 (2010) CrossRef M. Kochanowicz, J. Zmojda, P. Miluski, A. Baranowska, M. Leich, A. Schwuchow, M. Jager, M. Kuwik, J. Pisarska, W. A. Pisarski, D.Dorosz, "Tm3+/Ho3+ co-doped germanate glass and double-clad optical fiber for broadband emission and lasing above 2 µm", Optical Materials Express, 9, 3 (2019) CrossRef J. Zmojda, M. Kochanowicz, P. Miluski, W.A., Pisarski, J. Pisarska, R. Jadach, M. Sitarz, D. Dorosz, "Structural and optical properties of antimony-germanate-borate glass and glass fiber co-doped Eu3+ and Ag nanoparticles", Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy, 201 (2018) CrossRef P. Miluski, M. Kochanowicz, J. Zmojda, A. Baranowska, D. Dorosz, "Energy transfer of Tb(tmhd)3 - Rhodamine B in poly(methyl methacrylate) fiber for new photonic applications", Optical Materials 87, 132 (2019) CrossRef

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23

Hussey, C. D. "Optics and Lasers: including Fibres and Integrated Optics." IEE Proceedings J Optoelectronics 132, no. 3 (1985): 199. http://dx.doi.org/10.1049/ip-j.1985.0042.

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24

Fenelon, Thomas, Mahmoud M. Bakr, Laurence J. Walsh, and Roy George. "Effects of Lasers and Their Delivery Characteristics on Machined and Micro-Roughened Titanium Dental Implant Surfaces." Bioengineering 7, no. 3 (August 11, 2020): 93. http://dx.doi.org/10.3390/bioengineering7030093.

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The aim of the study was to investigate the effects of neodymium: yttrium aluminium garnet (Nd:YAG) (1064 nm) and erbium: yttrium aluminium garnet (Er:YAG) (2940 nm) laser energy on titanium when delivered with conventional optics (focusing handpieces or plain ended optical fibres) or with a conical tip. Machined and micro-roughened implant discs were subjected to laser irradiation under a variety of energy settings either dry (without water) or wet (with water). Samples were scanned using a 3D non-contact laser profilometer and analysed for surface roughness, volume of peaks and the maximum diameter of the ablated area. Conical tip designs when used with both lasers showed no surface effect at any power setting on both machined and micro-roughened implant surfaces, regardless of the irrigation condition. When used with conventional delivery systems, laser effects on titanium were dose related, and were more profound with the Nd:YAG than with the Er:YAG laser. High laser pulse energies caused surface fusion which reduced the roughness of micro-roughened titanium surfaces. Likewise, repeated pulses and higher power densities also caused greater surface modifications. The presence of water reduced the influence of laser irradiation on titanium. It may be concluded that conical fibres can reduce unwanted surface modification, and this may be relevant to clinical protocols for debridement or disinfection of titanium dental implants.

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25

Xue-Ming, Liu, Zhao Wei, Zhang Tong-Yi, Lu Ke-Qing, Sun Chuan-Dong, Wang Yi-Shan, Ouyang Xian, Hou Xun, and Chen Guo-Fu. "Multi-Wavelength Erbium-Doped Fibre Lasers on Assistance of High-Nonlinear Photonic-Crystal Fibres." Chinese Physics Letters 23, no. 7 (June 28, 2006): 1787–89. http://dx.doi.org/10.1088/0256-307x/23/7/036.

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26

Grukh, Dmitrii A., Andrei S. Kurkov, Vladimir M. Paramonov, and Evgenii M. Dianov. "Effect of heating on the optical properties of Yb3+-doped fibres and fibre lasers." Quantum Electronics 34, no. 6 (June 30, 2004): 579–82. http://dx.doi.org/10.1070/qe2004v034n06abeh002777.

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27

Zhao, Yucheng, and Stuart D. Jackson. "Highly efficient first order Raman fibre lasers using very short Ge-doped silica fibres." Optics Communications 253, no. 1-3 (September 2005): 172–76. http://dx.doi.org/10.1016/j.optcom.2005.04.063.

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28

Beugnot, Jean-Charles, Philippe Djemia, and Jérémie Margueritat. "Centenaire de la découverte de l’effet Brillouin." Photoniques, no. 114 (2022): 26–29. http://dx.doi.org/10.1051/photon/202111426.

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En 1922, Léon Brillouin publie seul et en français, dans les comptes rendus de physique un article sur la diffusion de la lumière par des ondes acoustiques d’origine thermique. Il démontre que ces ondes acoustiques induisent un décalage en fréquence de la lumière diffusée. L'invention des lasers a rendu cette diffusion très efficace et permis de nombreux développements technologiques et industriels en spectroscopie des matériaux, microscopie médicale, lasers et capteurs distribués à fibres optiques.

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Kasik, Ivan, Vlastimil Matejec, Jioí Kanka, and Pavel Honzatko. "Properties and fabrication of ytterbium-erbium co-doped silica fibres for high-power fibre lasers." Pure and Applied Optics: Journal of the European Optical Society Part A 7, no. 3 (May 1998): 457–65. http://dx.doi.org/10.1088/0963-9659/7/3/007.

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30

Leaver, K. D., and G. Pagiatakis. "Fabrication tolerances in fibre directional couplers designed to maximise coupling between fibres and diode lasers." IEE Proceedings - Optoelectronics 141, no. 1 (February 1, 1994): 69–74. http://dx.doi.org/10.1049/ip-opt:19949848.

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31

Bufetov, Igor' A., M. M. Bubnov, Mikhail A. Mel'kumov, V. V. Dudin, Aleksei V. Shubin, S. L. Semenov, K. S. Kravtsov, A. N. Gur'yanov, M. V. Yashkov, and Evgenii M. Dianov. "Yb-, Er—Yb-, and Nd-doped fibre lasers based on multi-element first cladding fibres." Quantum Electronics 35, no. 4 (April 30, 2005): 328–34. http://dx.doi.org/10.1070/qe2005v035n04abeh002926.

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Somkuarnpanit, S., D. Su, F. Villarreal, A. D. Colley, H. J. Baker, J. D. C. Jones, and D. R. Hall. "Beam delivery characteristics of optical fibres for carbon monoxide lasers." Optics and Lasers in Engineering 23, no. 4 (January 1995): 221–31. http://dx.doi.org/10.1016/0143-8166(94)00042-9.

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33

Blaser, Dunia, Pascal Hänzi, Sönke Pilz, Alexander Heidt, and Valerio Romano. "Multimode Ytterbium–Aluminosilicate Core Optical Fibre for Amplification and Laser Applications." Fibers 11, no. 11 (November 8, 2023): 95. http://dx.doi.org/10.3390/fib11110095.

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Rare-earth-doped optical fibres are widely used in lasers and amplifiers. The incorporation of ytterbium and aluminium oxide in a high doping concentration has led to the fabrication of a multi-mode (MM) optical fibre. Within this research, the design, preparation and calculation for the production of a fibre with a targeted 45 μm core diameter are explored. By Energy Dispersive X-ray (EDX) analysis, the doping concentrations of the elements in the core have been measured as 60.4 at.% Al and 1 at.% Yb. Supporting micrographs are used for confirming the core/cladding ratio. Based on the atomic percentage concentration, the calculated refractive index of the multi-element core has an n = 1.61 and an NA = 0.678. Characterisation of the fibre, including absorption and emission cross-section analysis, was performed in order to prove the ability of the fibre to be used for amplification as well as lasing applications.

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Zhang, Naizhong, Suzana Turk, Claire Davis, Wing K. Chiu, Tommy Boilard, and Martin Bernier. "Fatigue Performance of Type I and Type II Fibre Bragg Gratings Fabricated by Femtosecond Laser Inscription through the Coating." Sensors 22, no. 22 (November 15, 2022): 8812. http://dx.doi.org/10.3390/s22228812.

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Strain sensing technology using fibre Bragg grating (FBG) sensors is an attractive capability for aerospace structural health monitoring (SHM) and assessment because they offer resistance to harsh environments, low maintenance, and potential for high density and high strain sensing. The development of FBG inscription techniques through the fibre polymer coating using infrared (IR) lasers has overcome the mechanical weaknesses introduced by removal of the fibre coating, which is typically required for conventional UV laser inscription of FBGs. Type I and Type II femtosecond gratings are fabricated using through-coating inscription techniques, but the higher laser energy used for Type II gratings damages the glass fibre core, impacting mechanical performance. This paper investigates the fatigue performance of Type I and Type II through-coating FBG sensors with different fibre geometries and photosensitisation approaches to evaluate their overall reliability and durability, with a view to assess their performance for potential use in civil and defence SHM applications. The fatigue performance of FBG sensors was assessed under high-strain and high-frequency mechanical loading conditions by using a custom-designed electro-dynamically actuated loading assembly. In addition, pre- and post-fatigue microscopic analyses and high-resolution reflection spectrum characterisation were conducted to investigate the failure regions of the fibres and the effect of fatigue loading on reflection spectrum features. As expected, Type I gratings had a significantly higher fatigue life compared to Type II gratings. However, Type II gratings performed significantly better than conventional UV laser-inscribed FBGs and electrical foil strain gauges. Type II gratings withstand higher temperatures, and are therefore more suitable for application in harsh environments.

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35

Foley, B. M., P. Melman, and K. T. Vo. "Technique for alignment of semiconductor lasers to bevelled single-mode fibres." Electronics Letters 26, no. 25 (1990): 2118. http://dx.doi.org/10.1049/el:19901363.

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Reng, N., and T. Beck. "Transmission properties of all-silica fibres for high-power Nd:YAG lasers." Optics & Laser Technology 25, no. 2 (April 1993): 117–24. http://dx.doi.org/10.1016/0030-3992(93)90106-p.

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Schnitzer, I., A. Katzir, U. Schiessl, W. J. Riedel, and M. Tacke. "Evanescent field IR spectroscopy using optical fibres and tunable diode lasers." Materials Science and Engineering: B 5, no. 2 (January 1990): 333–37. http://dx.doi.org/10.1016/0921-5107(90)90079-q.

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38

Georges, Thierry, Thierry Dupoux, Thierry Chartier, and Elisabeth Boéri. "La photonique : de la deeptech à la filière structurée." Photoniques, no. 124 (2024): 20–25. http://dx.doi.org/10.1051/photon/202412420.

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La photonique est omniprésente dans notre vie quotidienne : des fibres optiques jusqu’aux écrans haute résolution de nos téléphones, en passant par les lasers qui révolutionnent la médecine et l’industrie. Elle est le moteur de nombreuses avancées technologiques. La science de la lumière progresse et rassemble ses forces pour passer du statut de deep tech à celui d’une véritable filière.

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39

Taylor, R. S., K. E. Leopold, S. Mihailov, and R. K. Brimacombe. "Damage measurements of fused silica fibres using long optical pulse XeCl lasers." Optics Communications 63, no. 1 (July 1987): 26–31. http://dx.doi.org/10.1016/0030-4018(87)90216-1.

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Hopfe, V., R. Jäckel, and K. Schönfeld. "Laser based coating and modification of carbon fibres: application of industrial lasers to manufacturing of composite materials." Applied Surface Science 106 (October 1996): 60–66. http://dx.doi.org/10.1016/s0169-4332(96)00393-5.

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41

Xiang, Chao, Warren Jin, Osama Terra, Bozhang Dong, Heming Wang, Lue Wu, Joel Guo, et al. "3D integration enables ultralow-noise isolator-free lasers in silicon photonics." Nature 620, no. 7972 (August 2, 2023): 78–85. http://dx.doi.org/10.1038/s41586-023-06251-w.

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AbstractPhotonic integrated circuits are widely used in applications such as telecommunications and data-centre interconnects1–5. However, in optical systems such as microwave synthesizers6, optical gyroscopes7 and atomic clocks8, photonic integrated circuits are still considered inferior solutions despite their advantages in size, weight, power consumption and cost. Such high-precision and highly coherent applications favour ultralow-noise laser sources to be integrated with other photonic components in a compact and robustly aligned format—that is, on a single chip—for photonic integrated circuits to replace bulk optics and fibres. There are two major issues preventing the realization of such envisioned photonic integrated circuits: the high phase noise of semiconductor lasers and the difficulty of integrating optical isolators directly on-chip. Here we challenge this convention by leveraging three-dimensional integration that results in ultralow-noise lasers with isolator-free operation for silicon photonics. Through multiple monolithic and heterogeneous processing sequences, direct on-chip integration of III–V gain medium and ultralow-loss silicon nitride waveguides with optical loss around 0.5 decibels per metre are demonstrated. Consequently, the demonstrated photonic integrated circuit enters a regime that gives rise to ultralow-noise lasers and microwave synthesizers without the need for optical isolators, owing to the ultrahigh-quality-factor cavity. Such photonic integrated circuits also offer superior scalability for complex functionalities and volume production, as well as improved stability and reliability over time. The three-dimensional integration on ultralow-loss photonic integrated circuits thus marks a critical step towards complex systems and networks on silicon.

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Ghislotti, G., A. Ferrari, S. Balsamo, V. Spano, F. Trezzi, and S. Morasca. "Wavelength-locked 980 nm semiconductor lasers for bidirectional pumping of erbium-doped fibres." Electronics Letters 38, no. 24 (2002): 1541. http://dx.doi.org/10.1049/el:20021023.

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Lachish, U., A. Bornstein, S. Rotter, U. El-Hanany, and L. Boehm. "Determination of IR radiation attenuation in chalcogenide glass fibres by tunable diode lasers." Infrared Physics 26, no. 2 (March 1986): 97–99. http://dx.doi.org/10.1016/0020-0891(86)90028-x.

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Dvoirin, V. V., V. M. Mashinskii, O. I. Medvedkov, A. A. Umnikov, Aleksei N. Gur'yanov, and Evgenii M. Dianov. "Bismuth-doped telecommunication fibres for lasers and amplifiers in the 1400–1500-nm region." Quantum Electronics 39, no. 6 (June 30, 2009): 583–84. http://dx.doi.org/10.1070/qe2009v039n06abeh014119.

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Schwander, T., B. Schwaderer, and H. Storm. "Coupling of lasers to single-mode fibres with high efficiency and low optical feedback." Electronics Letters 21, no. 7 (1985): 287. http://dx.doi.org/10.1049/el:19850206.

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46

Barthelemy, A., and M. Shalaby. "Nonlinear power limits of compression by optical fibres of chirped pulses emitted by diode lasers." Electronics Letters 29, no. 6 (1993): 533. http://dx.doi.org/10.1049/el:19930356.

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47

Cardinal, Thierry, Matthieu Lancry, Lionel Canioni, Bertrand Poumellec, and Wilfried Blanc. "Fonctionnaliser le verre pour de nouvelles propriétés optiques." Reflets de la physique, no. 74 (December 2022): 70–75. http://dx.doi.org/10.1051/refdp/202274070.

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Si le verre possède de nombreux atouts, ses propriétés optiques sont parmi les plus remarquables. Sa transparence et son indice de réfraction ont longtemps été reliés exclusivement à sa composition globale. Cependant, la structuration des propriétés optiques en surface ou au coeur du verre, à l’échelle micro ou nanométrique, connait un engouement particulier ces dernières années. Nous nous intéressons dans cet article à la structuration multidimensionnelle des verres par des impulsions lasers ultracourtes ou par l’insertion de nanoparticules au sein de fibres optiques. Cette approche mène à de nouvelles applications en photonique, mais aussi en optofluidique, optomécanique, micromoulage d’optiques ou encore pour le stockage optique pérenne d’informations.

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Pinto, Ana M. R., and Manuel Lopez-Amo. "All-fiber lasers through photonic crystal fibers." Nanophotonics 2, no. 5-6 (December 16, 2013): 355–68. http://dx.doi.org/10.1515/nanoph-2013-0026.

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AbstractA review on all-fiber lasers based on photonic crystal fibers is presented. Photonic crystal fibers present improved features beyond what conventional optical fibers can offer. Due to their geometric versatility, photonic crystal fibers can present special properties and abilities which can lead to enhanced lasing structures. A brief description of photonic crystal fibers and fiber laser’s properties is presented. All-fiber laser structures developed using photonic crystal fibers are described and divided in two groups, depending on the cavity topology: ring cavity fiber lasers and linear cavity fiber lasers. All-fiber lasers applications in the photonic crystal fiber related sensing field are described.

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Hofmann, Marcel, Dirk Wenzel, Bernd Gulich, Heike Illing-Günther, and Daisy Nestler. "Development of Nonwoven Preforms Made of Pure Recycled Carbon Fibres (rCF) for Applications of Composite Materials." Key Engineering Materials 742 (July 2017): 555–61. http://dx.doi.org/10.4028/www.scientific.net/kem.742.555.

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For the development of an efficient and economic recycling process of carbon fibers (CF) still many technological challenges have to be mastered. One of them is the removal of all extraneous natural and synthetic fibres, e.g. polyester sewing threads. The objective of the research was to develop an in-line process for the removal of those extraneous fibres, which result from mechanical processes such as tearing. A promising approach for the removal of extraneous fibres from cut-off carbon-fibre material (CF) has been identified, getting recycled carbon fibres (rCF). For that purpose, the use of modern laser technologies is particularly promising. However, the focus was not the development of new laser systems, but the adaptation of existing technologies and their integration into textile processing steps for carbon fibre recycling. In addition to the removal of the extraneous fibres, the degree of CF losses and quality degradation due to fibre damage have been analysed and compared with optimum fibre characteristics. The separation has been experimented and corresponding laser parameters have been defined. Finally, the obtained carbon-fibre material has been tested with regard to its processability in textile manufacturing processes (dry non-woven fabric production) up to carbon fibre reinforced plastics (CFRP). For the evaluation of the material for potential applications, test plates from irradiated and non-irradiated material have been used. The performed tensile and flexural tests have proved that the irradiated material has similar properties compared to the non-exposed one.

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Wilson, Brian C. "Photodynamic Therapy for Cancer: Principles." Canadian Journal of Gastroenterology 16, no. 6 (2002): 393–96. http://dx.doi.org/10.1155/2002/743109.

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The principles of photodynamic therapy (PDT), using drugs (photosensitizers) that are activated by light to become cytotoxic, provide the basis for understanding the current and potential future clinical applications in gastroenterology, general oncology and other specialities. The properties of photosensitizers are key to their biological efficacy, while lasers and optical fibres allow convenient and flexible light delivery for endoscopic use. PDT has several distinct and unique advantages, both as a stand-alone treatment and in combination with other established modalities. The current limitations are also recognized, as is the need for rigorous randomized trials of this emerging technology. The fluorescence of many photosensitizers may be useful, either for (endoscopic) diagnosis or for PDT treatment guidance and monitoring.

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