Mr. Rujian Xiang Profile

Rujian Xiang

at Institute of Applied Electronics

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Proceedings Article | 3 February 2015 Paper

Beam quality active control of a slab MOPA solid state laser

Rujian Xiang, Kai Zhang, Jing Wu, Yinglei Du, Zhongxiang Luo, Zhongwu He, Honglai Xu

Proceedings Volume 9255, 92552Y (2015) https://doi.org/10.1117/12.2065448

KEYWORDS: Actuators, Adaptive optics, Wavefronts, High power lasers, Wavefront sensors, Deformable mirrors, Beam shaping, Beam expanders, Beam controllers, Solid state lasers

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The wavefront of the output high power laser beam generated by a MOPA laser system with slab gain medium was measured and analyzed by an H-S wavefront sensor, the wavefront measured consisted the static aberration of the whole optic chain and the dynamic component caused by the laser driver. Analyzing results showed that the temporal frequency of the beam aberration was mostly less than 10Hz, but the spatial distribution of the aberration was more challengeable to the phase compensation. Due to the narrow rectangle shape of the laser gain medium and the none uniformity of the pumping and cooling, it had some local big slope cross the beam section, that caused a lot of difficulties to the aberration measuring and wavefront correcting, there were many high order components in the wide direction cross the beam, but the phase aberration was more smooth in the vertical direction. A beam expander which has different ratio in the x/y directions had been used for matching the beam aperture and the valid controlling range of the deformable mirror. An adaptive optical system consisted of an H-S wavefront sensor and a deformable mirror (DM) with 67 valid actuators which arranged in two dimensions as hexagon designed to compensate the phase aberration. The driving vector of the deformable mirror was calculated from the spot array which sampled by the H-S wavefront sensor from the target beam, the surface response of all actuators were pre-calibrated and saved as a matrix. The matrix invert method was used to calculate the driving vectors in the close loop steps. The beam quality factor β was adapted to evaluate the output beam from the adaptive optical system. Simulation and experiment results of the close loop correction about the adaptive optical system showed that the aberration was compensated to a very low level and the far field beam quality of the high power laser could reach 1.67xDL.

Proceedings Article | 3 February 2015 Paper

Wavefront reconstruction with total-least square method in an adaptive optic system with HS wavefront sensor

Rujian Xiang, Kai Zhang, Jing Wu

Proceedings Volume 9255, 92553B (2015) https://doi.org/10.1117/12.2065446

KEYWORDS: Wavefronts, Actuators, Adaptive optics, Wavefront reconstruction, Wavefront sensors, Deformable mirrors, Calibration, Computer simulations, Imaging systems, Wavefront aberrations

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Adaptive optic systems with HS Wave Front Sensor (WFS) and Deformable Mirror (DM) to compensate the aberration are used to improve the imaging quality and the far field quality laser beam widely, to get the correction driver vector that the deformable mirror needed to produce the conjugated reflecting surface, the matrix equation A⋅ x =ϕ should be solved. The least square method is the most choice used to solve the equation, but the result of the least square consider only about the error of vector ϕ , the solution vector x is no longer suitable while the response matrix A contain any error. A new method base on the total-least square to reconstruct the wavefront is presented, different from the traditional wavefront reconstructing with the least square method, the TLS method takes into account not only the error of vector ϕ , but also the error about the response function matrix A. For testing the characteristics of the solution vector x with the TLS method, an Adaptive Optical (AO) system with 67 actuators DM and 40x40 sub-apertures Hartmann-Shack (HS) WFS is used to simulate the wavefront reconstructing process, and result of simulation and experiments show that the driver vector calculated with TLS method is more stably and the wavefront aberration residual is more reasonable.

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