全息术
光学
斑点图案
梁(结构)
散斑噪声
激光束质量
衍射
空间光调制器
物理
相位恢复
噪音(视频)
衍射效率
计算机科学
算法
激光器
相(物质)
激光束
图像(数学)
傅里叶变换
人工智能
量子力学
作者
Pei Hui,Wenjing Liu,Axiu Cao,Qiling Deng
标识
DOI:10.1016/j.optcom.2018.09.076
摘要
Holographic laser beam shaping using a spatial light modulator can provide flexible adaptation of the intensity profile. However, speckle noise exists in the shaped beams, which reduces the beam quality seriously. In this paper, a new method is proposed to implement noise reduced flat-top beam shaping. The Gerchberg–Saxton (GS) algorithm with special spherical initial phase profile is adopted to calculate the phase-only hologram. When the spherical phase distribution is properly selected, the speckle free flat-top beam with high diffraction efficiency and low root-mean-square error can be obtained. Both simulations and experiments are performed to verify the feasibility of the proposed method. The comparison with the conventional GS algorithm using a random initial phase distribution is also carried out.
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