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Optical Engineering

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

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.

Paper Details

Date Published: 1 March 2003
PDF: 7 pages
Opt. Eng. 42(3) doi: 10.1117/1.1543175
Published in: Optical Engineering Volume 42, Issue 3
Show Author Affiliations
Emil J. Haellstig, Swedish Defence Research Agency (Sweden)
Lars Sjoeqvist, Swedish Defence Research Agency (Sweden)
Mikael Lindgren, Swedish Defence Research Agency (Sweden)

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