基于二维准螺旋M序列的衍射光学元件散斑抑制效率的实验评估

Experiment evaluation of speckle suppression efficiency of 2D quasi-spiral M-sequence-based diffractive optical element.

作者信息

Lapchuk A, Pashkevich G A, Prygun O V, Yurlov V, Borodin Y, Kryuchyn A, Korchovyi A A, Shylo S

出版信息

Appl Opt. 2015 Oct 1;54(28):E47-54. doi: 10.1364/AO.54.000E47.

DOI:10.1364/AO.54.000E47

Abstract

The quasi-spiral 2D diffractive optical element (DOE) based on M-sequence of length N=15 is designed and manufactured. The speckle suppression efficiency by the DOE rotation is measured. The speckle suppression coefficients of 10.5, 6, and 4 are obtained for green, violet, and red laser beams, respectively. The results of numerical simulation and experimental data show that the quasi-spiral binary DOE structure can be as effective in speckle reduction as a periodic 2D DOE structure. The numerical simulation and experimental results show that the speckle suppression efficiency of the 2D DOE structure decreases approximately twice at the boundaries of the visible range. It is shown that a replacement of this structure with the bilateral 1D DOE allows obtaining the maximum speckle suppression efficiency in the entire visible range of light.

摘要

设计并制造了基于长度N = 15的M序列的准螺旋二维衍射光学元件（DOE）。测量了通过DOE旋转的散斑抑制效率。对于绿色、紫色和红色激光束，分别获得了10.5、6和4的散斑抑制系数。数值模拟和实验数据结果表明，准螺旋二元DOE结构在散斑减少方面与周期性二维DOE结构一样有效。数值模拟和实验结果表明，二维DOE结构的散斑抑制效率在可见光范围边界处大约降低两倍。结果表明，用双边一维DOE替换这种结构可以在整个可见光范围内获得最大的散斑抑制效率。