Beam shaping of coherent laser beams is demonstrated using liquid crystal (LC) cells with optically patterned pixels. The twist angle of a nematic LC is locally set to either 0 or by an alignment layer prepared via exposure to polarized UV light. The two distinct pixel types induce either no polarization rotation or a polarization rotation, respectively, on a linearly polarized optical field. An LC device placed between polarizers functions as a binary transmission beam shaper with a highly improved damage threshold compared to metal beam shapers. Using a coumarin-based photoalignment layer, various devices have been fabricated and tested, with a measured single- shot nanosecond damage threshold higher than .
© 2011 Optical Society of AmericaFull Article | PDF Article
OSA Recommended Articles
Opt. Lett. 34(15) 2330-2332 (2009)
Appl. Opt. 52(14) 3368-3380 (2013)
C. Sheng, Q. Chen, R. A. Norwood, J. Wang, J. Thomas, and N. Peyghambarian
Appl. Opt. 50(30) 5788-5790 (2011)