Dr. Min Yang Profile

Dr. Min Yang

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Proceedings Article | 6 June 2021 Paper

Application research of spherical-aberration self-compensation in multi-pass laser amplifier

Xueyan Dong, Pingxue Li, Tingting Wang, Min Yang, Shun Li

Proceedings Volume 11849, 1184906 (2021) https://doi.org/10.1117/12.2597555

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In order to reduce the influence of thermal lens effect on beam quality of the multi-pass laser amplifier, a new method of spherical-aberration self-compensation based on ZEMAX physical optical simulation is proposed. Firstly, the change of quality of gaussian beam after passing the thermal lens is simulated according to the principle of geometric optics. And the simulation results show that if two identical thermal lenses are placed symmetrically near the focal point of the laser beam, the degradation of the beam quality caused by the first thermal lens can be compensated by the second thermal lens. Secondly, a four-pass laser amplifier based on the spherical-aberration self-compensation theory is designed by the sequence mode of ZEMAX software. Finally, according to the theoretical model, we design a picosecond fiber-solid hybrid laser amplifier which is seeded by an all polarization-maintaining (PM) fiber laser. The output power of the all PM fiber laser is 2 W. After the solid-state amplifier, the final output laser power reaches 8.5 W with M² factor of 1.2. The beam quality is well preserved by the four-pass amplification structure which is favorable to the spherical-aberration compensation. This system, which combines the advantages of the all PM fiber amplifier and the solid-state laser amplifier, enables high repetition rate and good beam quality with high gain picosecond pulses. It makes significant contributions to many applications such as material micro-processing, laser ranging and laser detection.

Proceedings Article | 17 May 2019 Paper

Theoretical and experimental study on nonlinear effects of mode-locked and extracavity modulation nanosecond pulsed laser

Shun Li, Pingxue Li, Min Yang, Kaixuan Wang, Wenhao Xiong, Chuanfei Yao

Proceedings Volume 11170, 111702G (2019) https://doi.org/10.1117/12.2533712

KEYWORDS: Pulsed laser operation, Fiber lasers, Mode locking, Modulation, Optical simulations, Laser scattering, Laser applications, Raman scattering, Raman spectroscopy, Single mode fibers

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Through simulation calculations and experiments, the two popular methods of generating nanosecond (ns) pulsed laser were studied respectively. A new method for generating a ns pulsed laser with high power and ultra-high repetition frequency by using dispersive fiber after SESAM mode-locked oscillator was proposed. In the simulation calculation of the mode-locked ns pulsed laser, the time-frequency evolution characteristics of the laser formation process were analyzed. The variation process of the stimulated Raman scattering (SRS) effect was obtained at different injection powers. In the simulation calculation of the extracavity modulation ns pulsed laser, the threshold of the stimulated Brillouin scattering (SBS) effect was obtained in the 4-stage fiber amplification experiment. Then, the nonlinear dynamics model of the ns pulsed fiber laser was established by considering various nonlinear effects. The results showed the theoretical models were consistent with the experimental investigations. This provided a new way to further optimize the parameter of ns pulsed fiber lasers and also contribute to solve nonlinear damage problems in such lasers.

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