摘要
讨论了傅里叶迭代算法对初始相位敏感的缺陷机理,提出用伪随机相位编码作为傅里叶迭代算法初始值的改进算法来克服相位敏感缺陷。改进算法具有加快迭代收敛速度、提高恢复图像强度准确性的优点。将该算法产生的任意期望图样的相位全息图写入纯相位液晶空间光调制器上,在远场成功地再现了期望图样。算法迭代10次可产生衍射效率接近85%的一幅相位全息图。作为一种快速相位恢复算法它在相控阵激光雷达以及光束敏捷偏转等领域有重要意义。
The shortcoming that the iterative Fourier transform algorithm （IFTA） is sensitive to initial phases is discussed. An improved IFTA algorithm with the initial phases generated by the pseudorandom phases encoding method is proposed to overcome the shortcoming. The improved method has the merits of fast iterative convergence and higher precision for image retrieval. When the retrieval kinoform generated from the improved algorithm is input into a phase-only liquid crystal spatial light modulator, the expected far-field image is obtained again. A kinoform with the diffractive efficiency of 85 % can be generated within 10 loops. As a quick phase retrieval algorithm, it is of value in the fields of phased array laser radar and agile beam steering.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2007年第2期219-224,共6页
Acta Optica Sinica
关键词
信息光学
傅里叶迭代算法
相位编码
相位全息
空间光调制器
information optics
iterative Fourier transform algorithm
phases encoding
kinoform
spatial light modulator
