Hollow Gaussian beam generated by beam shaping with phase-only liquid crystal spatial light modulator
Hollow Gaussian beam generated by beam shaping with phase-only liquid crystal spatial light modulator
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DOI：
10.1016/j.optlastec.2011.07.021
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发表时间：
2012-03-01
影响因子：
5
通讯作者：
Hu, Wenhua
中科院分区：
文献类型：
--
作者：
Nie, Yongming;Li, Xiujian;Hu, Wenhua
基于折射式光束整形系统，提出了利用纯相位液晶空间光调制器（LC-SLM）将准高斯光束变换为空心高斯光束的方法。根据能量守恒和等光程原理，非球面透镜和纯相位液晶空间光调制器的相位分布可以对波前进行适当的调制，从而产生空心光束。数值模拟结果表明，经过整形后的输出光束在一定的传输距离内可以保持较好的暗空心光强分布，并且在此传输距离内，光束的暗区不会减小，而理想空心高斯光束的暗区会减小。实验结果表明，通过设计相位调制分布，并将其加载到液晶空间光调制器中，即使在距离液晶空间光调制器550 mm以上的情况下，输出整形光束仍能保持较好的暗空心光强分布，这与数值模拟结果相吻合。(C)2011爱思唯尔有限公司保留所有权利。
Based on the refractive beam shaping system, the transformation of a quasi-Gaussian beam into a dark hollow Gaussian beam by a phase-only liquid crystal spatial light modulator (LC-SLM) is proposed. According to the energy conservation and constant optical path principle, the phase distribution of the aspheric lens and the phase-only LC-SLM can modulate the wave-front properly to generate the hollow beam. The numerical simulation results indicate that, the dark hollow intensity distribution of the output shaped beam can be maintained well for a certain propagation distance during which the dark region will not decrease whereas the ideal hollow Gaussian beam will do. By designing the phase modulation profile, which loaded into the LC-SLM carefully, the experimental results indicate that the dark hollow intensity distribution of the output shaped beam can be maintained well even at a distance much more than 550 mm from the LC-SLM, which agree with the numerical simulation results. (C) 2011 Elsevier Ltd. All rights reserved.