Intensity variations using a quantized spatial light modulator for nonmechanical beam steering

被引：22

作者：

Hällstig, E ^{[1
]}

Sjöqvist, L ^{[1
]}

Lindgren, M ^{[1
]}

机构：

[1] Swedish Def Res Agcy, Dept Laser Syst, SE-58111 Linkoping, Sweden

来源：

OPTICAL ENGINEERING | 2003年 / 42卷 / 03期

关键词：

spatial light modulator; liquid crystal; beam steering; phase modulation; quantization;

D O I：

10.1117/1.1543175

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A liquid-crystal spatial light modulator (SLM) can be used to alter the phase of the wavefront to achieve a deflection or a change in the shape of a laser beam. Ideal blazed gratings have perfect diffraction efficiency, and all the light is deflected. Encoded onto a pixelated spatial light modulator, however, the spatial limitations and phase quantization result in a stepped, nonideal blazed grating and decreased diffraction efficiency. The far-field intensity distribution was measured for different deflection angles using 4 and 32 phase levels. The result has been analyzed and used to construct a simple model of the studied SLM. Simulations of the far field based on this model show good agreement with the experimental results. (C) 2003 Society of Photo-Optical Instrumentation Engineers.

引用

页码：613 / 619

页数：7

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