BEAM DEFLECTORS

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

[+] Author Affiliations
Emil Ha¨llstig, Lars Sjo¨qvist, Mikael Lindgren

Swedish Defence Research Agency, Department of Laser Systems, Box 1165, SE-581?11, Linko¨ping, Sweden E-mail: emil@foi.se

Opt. Eng. 42(3), 613-619 (Mar 01, 2003). doi:10.1117/1.1543175
History: Received Jun. 24, 2002; Revised Aug. 21, 2002; Accepted Sep. 4, 2002; Online March 07, 2003
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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. © 2003 Society of Photo-Optical Instrumentation Engineers.

© 2003 Society of Photo-Optical Instrumentation Engineers

Citation

Emil Ha¨llstig ; Lars Sjo¨qvist and Mikael Lindgren
"Intensity variations using a quantized spatial light modulator for nonmechanical beam steering", Opt. Eng. 42(3), 613-619 (Mar 01, 2003). ; http://dx.doi.org/10.1117/1.1543175


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