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Numerical investigation of the influence of wavefront distortion on the laser near-field characteristics

Published online by Cambridge University Press:  23 October 2017

S. Li*
Affiliation:
Science and Technology on Electro-Optical Information Security Control Laboratory, Tianjin 300308, China National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin 150080, China
Z. Lu
Affiliation:
National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin 150080, China
X. Fan
Affiliation:
Institute of New Electromagnetic Materials & School of Physics and Optoelectronic Engineering, Weifang University, Weifang 261061, China
L. Ding
Affiliation:
Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
*
Address correspondence and reprint requests to: S. Li, Science and Technology on Electro-Optical Information Security Control Laboratory, Tianjin 300308, China. E-mail: sensli@163.com
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Abstract

The effect of the initial phase distortion of the laser on near-field transmission characteristics in free space is investigated both numerically and theoretically. It is demonstrated and proposed that the near-field modulation and fluence contrast of the output laser beam are changing with the increase of both spatial low- and high-frequency wavefront distortion. The simulation results show that in order to ensure the beam quality in propagation, the Fresnel number should be controlled not <50 generally and the wavefront distortion should also be minimized by controlling both low- and high-frequency phase coefficient not larger than 0.6.

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Type
Research Article
Copyright
Copyright © Cambridge University Press 2017 

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