Adaptive beam shaping for improving the power coupling of a two-Cassegrain-telescope

作者：Ma, Haotong^*; Hu, Haojun; Xie, Wenke; Zhao, Haichuan; Xu, Xiaojun; Chen, Jinbao

来源：Optics and Lasers in Engineering, 2013, 51(8): 1008-1013.

DOI：10.1016/j.optlaseng.2013.03.002

• Atmospheric turbulence
• Atmospheric propagation
• Laser beam transmission
• Power coupling
• Beam shaping

We demonstrate the adaptive beam shaping for improving the power coupling of a two-Cassegrain-telescope based on the stochastic parallel gradient descent (SPGD) algorithm and dual phase only liquid crystal spatial light modulators (LC-SLMs). Adaptive pre-compensation the wavefront of projected laser beam at the transmitter telescope is chosen to improve the power coupling efficiency. One phase only LC-SLM adaptively optimizes phase distribution of the projected laser beam and the other generates turbulence phase screen. The intensity distributions of the dark hollow beam after passing through the turbulent atmosphere with and without adaptive beam shaping are analyzed in detail. The influence of propagation distance and aperture size of the Cassegrain-telescope on coupling efficiency are investigated theoretically and experimentally. These studies show that the power coupling can be significantly improved by adaptive beam shaping. The technique can be used in optical communication, deep space optical communication and relay mirror.

• 出版日期2013-8
• 单位中国人民解放军国防科学技术大学