Application of Hartmann-Shack Wave Front Detector in Testing Distorted Wave Front of Conduction Cooled End-Pumped Slab

Liujing, 徐鎏婧 Xu; Ping, 杨平 Yang; Xingbo, 梁兴波 Liang; Chao, 王超 Wang; Xiaojun, 唐晓军 Tang; Yang, 刘洋 Liu; Lei, 刘磊 Liu; Hong, 赵鸿 Zhao

doi:10.3788/cjl201138.0802006

Cited by 3 publications

(2 citation statements)

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“…[1][2][3] However, when the output power was further increased to a certain level, the deterioration of beam quality become a severe problem, although great efforts has been made to ensure uniform pumping and cooling of the slab. In the aberrations of some high power slab lasers, thermally induced low order aberrations, mainly defocus and astigmatism, has increased to a level far beyond the correction capability of deformable mirrors [4,5] . To compensate the large aberrations in slab lasers, multiple deformable mirrors were proposed as a solution [6,7] .…”

Section: Introductionmentioning

confidence: 99%

Compensation of low order aberrations with reflective beam shaping system

Liu

Zhou

et al. 2014

Laser Sources and Applications II

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Compensation of low order aberrations is essential for high power solid state slab laser. With the increase of output power, the peak-to-valley of wavefront distortion increase to dozens of micrometer. It's difficult to control the wavefront with deformable mirrors which always has limited stroke(<20μm). In this paper, a reflective beam shaping system is designed to shaping the beam spot from rectangular to squarer. The beam shaping system consists of two x-oriented cylindrical mirrors and two y-oriented cylindrical mirrors. Simulations of PID control algorithm for actively compensating of low-order aberrations with reflective beam shaping system are presented. It shows that different combinations of defocus, 0 o astigmatism and 45 o astigmatism, which is the main contributor of beam aberrations in slab laser, can be well compensated by adjustment of distance and rotation angle of mirrors. And the convergence is fast when the control error signal is set to a suitable combination of low order Zernike coefficients. For beam with wave aberrations (PtV=82.6λ, RMS=18.2λ, Z4=23.6, Z5=7.1, Z6=19.6), the adjustment of distance between mirrors is below 100mm, and the rotation angle about z-axis is below 2 degree. The wavefront aberrations are decreased to a low level (PV=0.16λ, RMS=0.04λ) which can be easily corrected later with DM.

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Section: Introductionmentioning

confidence: 99%

Compensation of low order aberrations with reflective beam shaping system

Liu

Zhou

et al. 2014

Laser Sources and Applications II

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“…[1][2][3] In order to measuring the wavefront of laser beam by Hartman-shack sensor the cylindrical transmitted beam reshaping system must be used for the rectangular beam of slab laser. However, when the output power was further increased to a certain level, the deterioration of beam quality become a severe problem, although great efforts has been made to ensure uniform pumping and cooling of the slab.…”

Section: Introductionmentioning

confidence: 99%

Simulation of wavefront reconstruction in beam reshaping system for rectangular laser beam

2014

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A new method to calculating the wavefront of slap laser is studied in this paper.The method is based on the ray trace theory of geometrical optics. By using the Zemax simulation software and Matlab calculation software, the wavefront of rectangular beam in beam reshaping system is reconstructed. Firstly, with the x-and y-slope measurement of reshaping beam the direction cosine of wavefront can be calculated. Then, the inverse beam path of beam reshaping system is built by using Zemax simulation software and the direction cosine of rectangular beam can be given, too. Finally, Southwell zonal model is used to reconstruct the wavefront of rectangular beam in computer simulation. Once the wavefront is received, the aberration of laser can be eliminated by using the proper configuration of beam reshaping system. It is shown that this method to reconstruct the wavefront of rectangular beam can evidently reduce the negative influence of additional aberration induced by beam reshaping system.

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Active compensation of low-order aberrations with reflective beam shaper

et al. 2014

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A reflective beam shaper is designed for the purpose of compensation of the low-order aberrations in high-power slab lasers. A proportional-integral-derivative (PID) control algorithm is used to control the optical parameters of a beam shaper for active compensation of low-order aberrations. Simulations of the PID algorithm show that different combinations of defocus, 0-deg astigmatism, and 45-deg astigmatism, which are the main contributors of beam aberrations in slab lasers, can be well compensated by variation of distance and rotation angle of mirrors. For a beam with large wave aberrations [peak-to-valley ðPtVÞ ¼ 87.7λ, root-mean-square ðRMSÞ ¼ 19λ], the adjustment of distance between mirrors is less than 100 mm, and the rotation angle about the z-axis is <3.2 deg, and the wavefront distortion is reduced to a level (PtV ¼ 0.50λ, RMS ¼ 0.09λ) that can be further corrected with one deformable mirror. The effectiveness and performance of low-order aberration compensation with the reflective beam shaper are also verified by experiments.

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Application of Hartmann-Shack Wave Front Detector in Testing Distorted Wave Front of Conduction Cooled End-Pumped Slab

Cited by 3 publications

References 0 publications

Compensation of low order aberrations with reflective beam shaping system

Compensation of low order aberrations with reflective beam shaping system

Simulation of wavefront reconstruction in beam reshaping system for rectangular laser beam

Active compensation of low-order aberrations with reflective beam shaper

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