Zhixian Li
National University of Defense Technology
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Featured researches published by Zhixian Li.
Applied Optics | 2011
Zhixian Li; Jiong-qi Wang; Xiaoqiang Peng; L. T. Ho; Ziqiang Yin; Shengyi Li; Chi-fai Benny Cheung
Single point diamond turning (SPDT) is highly controllable and versatile in producing axially symmetric forms, non-axially-symmetric forms, microstructured surfaces, and free forms. However, the fine SPDT marks left in the surface limit its performance, and they are difficult to reduce or eliminate. It is unpractical for traditional methods to remove the fine marks without destroying their forms, especially for the aspheres and free forms. This paper introduces abrasive jet polishing (AJP) for the posttreatment of diamond-turned surfaces to remove the periodic microstructures. Samples of diamond-turned electroless nickel plated plano mirror were used in the experiments. One sample with an original surface roughness of more than 400 nm decreased to 4 nm after two iterations abrasive jet polishing; the surface roughness of another sample went from 3.7 nm to 1.4 nm after polishing. The periodic signatures on both of the samples were removed entirely after polishing. Contrastive experimental research was carried out on electroless nickel mirror with magnetorheological finishing, computer controlled optical surfacing, and AJP. The experimental results indicate that AJP is more appropriate in removing the periodic SPDT marks. Also, a figure maintaining experiment was carried out with the AJP process; the uniform polishing process shows that the AJP process can remove the periodic turning marks without destroying the original form.
Optics Express | 2017
Yubin Chen; Zefeng Wang; Zhixian Li; Wei Huang; Xiaoming Xi; Qisheng Lu
We report on what is, to the best of our knowledge, the first ultra-efficient 1.5 μm Raman amplifier in a methane-filled anti-resonance hollow-core fiber. A 1.5 μm single frequency seed laser is coupled into the hollow-core fiber together with a 1064 nm pulsed pump laser using a shortpass dichromic mirror, and then amplified by stimulated Raman scattering of methane. A maximum optical-to-optical conversion efficiency of 66.4% has been obtained, resulting in a record near quantum-limit efficiency of 96.3% in a 2 m long hollow-core fiber filled with only 2 bar methane gas. This kind of gas filled hollow-core Raman amplifier provides a potential method to obtain high efficiency mid-infrared laser sources with low threshold and narrow linewidth in various applications.
Infrared, Millimeter-Wave, and Terahertz Technologies IV | 2016
Zefeng Wang; Zhiyue Zhou; Zhixian Li; Naiqian Zhang; Yubin Chen
We report here a step tunable mid-infrared laser emission from acetylene-filled hollow-core fiber. Two kinds of anti-resonant hollow-core fibers are filled with mbar level of acetylene gas, and pumped with a modulated, amplified, narrow linewidth, fine tunable, 1.5 μm diode laser, then 3 μm laser emissions are generated by the intrinsic absorption of acetylene molecules. The laser wavelength is step-tunable in the range of 3.1~3.2 μm when the pump laser is precisely tuned to different absorption lines of P-branch of acetylene. By properly designing the fibers transmission bands, and carefully selecting active gases and pump lasers, this paper provides a novel method for efficient, compact and tunable mid-infrared fiber lasers over a broad spectrum range.
Optics Express | 2018
Zhiyue Zhou; Ni Tang; Zhixian Li; Wei Huang; Zefeng Wang; Wuming Wu; Weihong Hua
High-power tunable pulsed and CW mid-infrared fiber gas laser sources in acetylene-filled hollow-core fibers, to the best of our knowledge, are demonstrated for the first time. By precisely tuning the wavelength of the pump source, an amplified tunable 1.5 μm diode laser, to match different absorption lines of acetylene, the laser output is step-tunable in the range of 3.09~3.21 μm with a maximum pulse average power of ~0.3 W (~0.6 μJ pulse energy) and a maximum CW power of ~0.77 W, making this system the first watt-level tunable fiber gas laser operating at mid-infrared range. The output spectral and power characteristics are systemically studied, and the explanations about the change of the ratio of the P over R branch emission lines with the pump power and the gas pressure are given, which is useful for the investigations of mid-infrared fiber gas lasers.
Applied Optics | 2017
Zefeng Wang; Bo Gu; Yubin Chen; Zhixian Li; Xiaoming Xi
Optics Letters | 2018
Zhixian Li; Wei Huang; Yulong Cui; Zefeng Wang
Optics Express | 2018
Zhixian Li; Wei Huang; Yulong Cui; Zefeng Wang; Wuming Wu
Optical Fiber Technology | 2018
Zhiyue Zhou; Zhixian Li; Ni Tang; Junjie Sun; Kai Han; Zefeng Wang
Optical Engineering | 2018
Zhixian Li; Zhiyue Zhou; Wei Huang; Yulong Cui; Zefeng Wang
Laser Physics | 2018
Zhiyue Zhou; Ni Tang; Zhixian Li; Zefeng Wang; Weihong Hua