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Proceedings Paper

Effect of phase valley on diffraction efficiency of liquid crystal optical phased array
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Paper Abstract

The discreteness of driving electrodes in liquid crystal optical phased array (LCOPA) device causes phase valley in the region between two adjacent electrodes. When a one-dimensional transmission-type LCOPA device was used, there was a pair of diffraction sidelobes with considerable intensity on either side of the deflected beam, which decreased the diffraction efficiency of deflected beam greatly. An analytical numerical model of phase valley was proposed for the quantitative analytic analysis on diffraction efficiency. Results showed that phase valley is the cause for diffraction sidelobes. The diffraction efficiency of deflected beam decreases steeply as the phase valley depth increases. When valley depth decreases close to zero, the main factor having affect on diffraction efficiency turns to be flyback region size. The influence of electrode space on diffraction efficiency was quantitatively analyzed as well. An effective way to reduce or even eliminate the phase valley is to reduce the space between electrodes.

Paper Details

Date Published: 12 January 2009
PDF: 8 pages
Proc. SPIE 7133, Fifth International Symposium on Instrumentation Science and Technology, 71333L (12 January 2009); doi: 10.1117/12.821247
Show Author Affiliations
Lin Xu, Harbin Institute of Technology (China)
Liying Wu, Harbin Institute of Technology (China)
Jian Zhang, Harbin Institute of Technology (China)
Xiang Liu, Harbin Institute of Technology (China)

Published in SPIE Proceedings Vol. 7133:
Fifth International Symposium on Instrumentation Science and Technology
Jiubin Tan; Xianfang Wen, Editor(s)

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