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12 September 2007 Nonlinear dye-doped liquid crystals for fast and broadband CW and long-pulse laser power control and switching
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Abstract
We present a theoretical model and some experiment demonstrations of all-optical passive switching processes with 90° twist-aligned nano-doped nematic liquid crystal cells sandwiched between two crossed polarizers. The photosensitive dopants give rise to laser induced dye-assisted director axis reorientation and order parameter modifications, which in turn produce an intensity dependent polarization switching and hence a transmission modulation capability. Experimental observations are in good agreement with our expectation derived from modified Jones matrix analysis and also demonstrate the feasibility of an efficient [microwatt power] low threshold polarization and fast switching [microseconds] all optical limiting device for visible as well as infrared lasers or bright light sources.
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J. D. Liou, J. H. Park, M. V. Stinger, A. Diaz, J. Huang, and I. C. Khoo "Nonlinear dye-doped liquid crystals for fast and broadband CW and long-pulse laser power control and switching", Proc. SPIE 6654, Liquid Crystals XI, 66540T (12 September 2007); https://doi.org/10.1117/12.732431
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