Dr. Dongfeng Zhao Profile

Dr. Dongfeng Zhao

Director at Goertek Inc

SPIE Involvement:

Author

Publications (7)

Proceedings Article | 23 February 2017 Paper

Experimental study on final optics assembly at 351nm laser

Zhaoyang Jiao, Dongfeng Zhao, Mingying Sun, Lei Ren, Jianqiang Zhu

Proceedings Volume 10084, 100840E (2017) https://doi.org/10.1117/12.2251978

KEYWORDS: Laser energy, High power lasers, Laser optics, Lens design, Polarization, Diagnostics, Optical design, Energy conversion efficiency, Energy efficiency, Physics, Crystals, Laser crystals

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Proceedings Article | 23 February 2017 Presentation + Paper

High power glass laser research progresses in NLHPLP

Jianqiang Zhu, Jian Zhu, Xuechun Li, Baoqiang Zhu, Weixin Ma, Dean Liu, Cheng Liu, Xingqiang Lu, Wei Fan, Zhigang Liu, Dongfeng Zhao, Shenlei Zhou, Yanli Zhang, Li Wang, Mingying Sun, Bingyan Wang, Zhaoyang Jiao, Lei Ren, Guowen Zhang, Jie Miao, Zunqi Lin

Proceedings Volume 10084, 1008405 (2017) https://doi.org/10.1117/12.2251731

KEYWORDS: High power lasers, Optical amplifiers, Fusion energy, Laser damage threshold, Glasses, Laser glasses, Physics, Laser development, Prototyping, Near field, Spatial filters, Modulation

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A new high power laser facility with 8 beams and maximum output energy of one beam 5kJ/3.4ns/3ω has been performed and operated since 2015. Combined together the existing facilities have constructed a multifunction experimental platform including multi-pulse width of ns, ps and fs and active probing beam, which is an effective tool for Inertial Confinement Fusion (ICF) and High Energy Density (HED) researches. In addition another peculiar high power laser prototype pushes 1ω maximum output energy to 16kJ in 5ns and 17.5kJ in 20ns in flat-in-time pulse, this system is based on large aperture four-pass main amplifier architecture with 310mm×310mm output beam aperture. Meanwhile the near field and far field have good quality spanning large energy scope by use of a wide range of technologies, such as reasonable overall design technique, the integrated front end, cleanness class control, nonlinear laser propagation control, wave-front adaptive optics and precision measurement. Based on this excellent backup, 3ω damage research project is planning to be implemented. To realize the above aims, the beam expanding scheme in final transport spatial filter could be adopted considering tradeoff between the efficient utilization of 1ω output and 3ω damage threshold. Besides for deeply dissecting conversion process for beam characteristic influence of 1ω beam, WCI (Wave-front Code Image) instrument with refined structure would be used to measure optical field with simultaneous high precision amplitude and phase information, and what’s more WCI can measure the 1ω, 2ω and 3ω optical field in the same time at same position, so we can analyze the 3ω beam quality evolution systematically, and ultimately to improve the 3ω limited output.

In a word, we need pay attention to some aspects contents with emphasis for future huger laser facility development. The first is to focus the new technology application. The second is to solve the matching problem between 1ω beam and the 3ω beam. The last is to build the whole effective design in order to improve efficiency and cost performance.

SPIE Journal Paper | 13 October 2016

Mitigation of beam sampling grating damage induced by upstream flaws in the final optics assembly

Zhaoyang Jiao, Mingying Sun, Dongfeng Zhao, Jianqiang Zhu

OE, Vol. 56, Issue 01, 011021, (October 2016) https://doi.org/10.1117/12.10.1117/1.OE.56.1.011021

KEYWORDS: Modulation, Frequency converters, Optical components, Nonlinear optics, High power lasers, Near field optics, Laser induced damage, Control systems, Laser systems engineering, Optical damage

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Proceedings Article | 22 July 2016 Paper

Mitigation of BSG damage caused by upstream flaw in the final optics assembly

Zhaoyang Jiao, Mingying Sun, Dongfeng Zhao, Jianqiang Zhu

Proceedings Volume 9983, 99831D (2016) https://doi.org/10.1117/12.2235623

KEYWORDS: Optical components, High power lasers, Modulation, Wavefronts, Optical simulations, Laser induced damage, Near field optics, Frequency converters, Nonlinear optics, Near field

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