Dr. Youen Jiang Profile

Dr. Youen Jiang

at Shanghai Institute of Optics and Fine Mechanics

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Author

Publications (11)

Proceedings Article | 22 December 2023 Paper

Development of thin disk gain medium based on photoadhesion technology

Zuqiang Li, Qi Xiao, Xue Pan, Xinghua Lu, Jiangfeng Wang, Youen Jiang, Wei Fan, Xuechun Li

Proceedings Volume 12974, 129740K (2023) https://doi.org/10.1117/12.3015320

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Proceedings Article | 15 December 2022 Paper

Optical fiber dispersion measurements based on spectral shaping and frequency-to-time mapping

Min Fu, Youen Jiang, Qi Xiao, Xue Pan, Li Zhou, Xuechun Li, Jianqiang Zhu

Proceedings Volume 12478, 1247824 (2022) https://doi.org/10.1117/12.2654704

KEYWORDS: Spatial light modulators, Optical fibers, Modulation, Optical testing, Light sources, Dispersion, Data modeling, Spectral resolution, Pulsed laser operation

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Proceedings Article | 1 November 2021 Paper

The key technologies in the kW-class thin-disk laser

Yusen Shi, Peng Zhang, Jiangfeng Wang, Youen Jiang, Wei Fan, Xuechun Li

Proceedings Volume 12057, 120574F (2021) https://doi.org/10.1117/12.2606946

KEYWORDS: Crystals, Resonators, Time division multiplexing, Mirrors, Photovoltaics, Absorption, Optical amplifiers, Laser crystals, Laser resonators, Laser applications

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Proceedings Article | 18 April 2021 Presentation + Paper

Laser-induced damage resistance enhancement of fused silica optics by rapid laser micromachining

Li Zhou, Youen Jiang, Hui Wei, Peng Zhang, Xue Pan, Wei Fan, Xuechun Li

Proceedings Volume 11777, 117770T (2021) https://doi.org/10.1117/12.2587023

KEYWORDS: Laser optics, Silica, Micromachining, Laser induced damage, Resistance, Laser systems engineering, Laser processing, Laser damage threshold, High power lasers, Femtosecond phenomena

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The issue of laser-induced damage on critical components emerges as a bottleneck that limits the high-power or high-energy laser systems, especially for the fused silica optics used in ultraviolet light. Sub-surface defects such as microcracks and impurities on fused silica optics have been discovered as damage precursors and determine the laser-induced damage threshold (LIDT) of the optics. Under the state-of-the-art advanced mitigation processes (AMP) and laser conditioning, only a few destructive damage sites that grow rapidly with successive shots still exist on a large-aperture fused silica optic. Therefore, we propose a method of selectively eliminating the destructive damage sites on fused silica optics by laser micromachining and consequently lead to a significant enhancement of LIDT in this paper. The removal of a damage site is implemented by precisely shaping the destructive damage site into an optically benign cone of special design using a femtosecond laser, with a subsequent CO₂-laser-polishing process to reduce the roughness. Compared with previous methods, the thermal effect on the processed region is dramatically reduced because of the nonthermal ablation by a femtosecond laser. Through optimizing the parameters of laser micromachining, a typical damage site is eliminated and replaced with a designed cone of excellent quality. The manufactured cone typically has a smooth wall with a slope angle of 12°, a diameter of 800 μm, and a negligible raised rim with a height of 14.5 nm (∼ λ/25 @ 355 nm). By employing the raster scan LIDT test procedure, several fused silica optics processed by laser micromachining are investigated and a laser-induced damage threshold (@ 355 nm, 1.6 ns) higher than 14 J/cm² and 10 J/cm² on the input surface and output surface are discovered, respectively. Furthermore, the downstream light intensification is proven to be trivial in the absence of a detrimental high-intensity central spot, owing to the ultra-low raised rim. These results demonstrate that rapid laser micromachining is an effective way to improve laser-induced damage resistance of fused silica optics and eventually enhance the performance of high-power or high-energy laser systems.

Proceedings Article | 8 July 2019 Paper

Mitigation of laser induced damage on dielectric mirrors in a robust way

Li Zhou, Youen Jiang, Simin Zhang, Hui Wei, Wei Fan, Xuechun Li

Proceedings Volume 11063, 1106311 (2019) https://doi.org/10.1117/12.2540919

KEYWORDS: Dielectric mirrors, Laser induced damage, Coating, Resistance, Laser systems engineering, Laser ablation, Antireflective coatings, Multilayers, Mirrors, Laser scattering

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Proceedings Article | 29 March 2019 Paper

Safe criterions for front-surface digs in fused silica optics

Simin Zhang, Youen Jiang, Li Zhou, Wei Fan, Xuechun Li

Proceedings Volume 11046, 110462N (2019) https://doi.org/10.1117/12.2524491

KEYWORDS: Silica, Modulation, Diffraction, High power lasers, Laser induced damage, Surface finishing, National Ignition Facility, Optical components, Laser damage threshold

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Proceedings Article | 31 October 2016 Paper

High precision long-term stable fiber-based optical synchronization system

Yurong Li, Xiaochao Wang, Youen Jiang, Zhi Qiao, Rao Li, Wei Fan

Proceedings Volume 10019, 100191D (2016) https://doi.org/10.1117/12.2246159

KEYWORDS: Pulsed laser operation, Laser systems engineering, Fiber lasers, Picosecond phenomena, Optical amplifiers, Modulators, Signal processing, Lithium, High power lasers, Physics

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Proceedings Article | 15 October 2015 Paper

Compensation system for FM-to-AM effects in high-power laser system

Zuiyu Chen, Youen Jiang, Jiangfeng Wang, Wei Fan, Xuechun Li

Proceedings Volume 9671, 96711F (2015) https://doi.org/10.1117/12.2199901

KEYWORDS: Liquid crystals, Crystals, High power lasers, Birefringence, Laser systems engineering, Fabry–Perot interferometers, Amplifiers, Fiber lasers, Amplitude modulation, Optical amplifiers

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Proceedings Article | 17 September 2013 Paper

Performance of smoothing by spectral dispersion combined with distribute phase plate on SG-II

Youen Jiang, Rong Wu, Shenlei Zhou, Jinghui Li, Xuechun Li, Zunqi Lin

Proceedings Volume 8904, 890403 (2013) https://doi.org/10.1117/12.2030706

KEYWORDS: Frequency modulation, Fermium, Spatial frequencies, Modulation, Pulsed laser operation, Modulators, Phase shift keying, Laser energy, Distortion, High power lasers

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Proceedings Article | 12 January 2012 Paper

Research for ultra-short pulse ablation of dielectric film mirror

Zhimin Xiong, Panzheng Zhang, Youen Jiang, Xiaochao Wang, Dajie Huang, Wei Fan, Xuechun Li

Proceedings Volume 8206, 82060V (2012) https://doi.org/10.1117/12.910257

KEYWORDS: Laser ablation, Laser damage threshold, Dielectrics, Mirrors, Pulsed laser operation, Modulation, Optical components, Multilayers, Reflection, High power lasers

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Proceedings Article | 19 February 2011 Paper

Research of diode-pumped cryogenic Yb:YAG amplification at 10 Hz repetition rate

Jiangfeng Wang, Youen Jiang, Xuechun Li, Xiang Li

Proceedings Volume 7916, 79160M (2011) https://doi.org/10.1117/12.877652

KEYWORDS: Optical amplifiers, Cryogenics, Crystals, Fusion energy, Pulsed laser operation, Semiconductor lasers, Laser crystals, Optical resonators, Ytterbium, YAG lasers

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Showing 5 of 11 publications

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