5 January 2004 Thermal holographic gratings with orientational enhancement in a liquid crystal cell at 1500 nm
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Abstract
The study of thermally induced holographic gratings written in NLC by the laser beams at telecommunication wavelength of 1500 nm is presented. Thermally induced gratings are especially interesting as having at least one order of magnitude faster response time than orientational gratings. However, their formation in the range 1300-1600 nm is limited due to small absorption of NLCs and absence of effective doping. The formation of thermal grating in our cell is initiated by absorption in the cell walls coating. The tuning of liquid crystal temperature and orientational enhancement of thermal grating allowed us to reach 3% level of diffraction efficiency at low writing beams intensity (23 Wcm-2) and small thickness of material (0.02 mm). Holographic liquid crystal devices can be used in all-optical switching, beam routing, automatic wave front correction, phase conjugation etc.
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Alexander S. Kuzhelev, Alexander S. Kuzhelev, Alexander E. Dudelzak, Alexander E. Dudelzak, Michael Maszkiewicz, Michael Maszkiewicz, } "Thermal holographic gratings with orientational enhancement in a liquid crystal cell at 1500 nm", Proc. SPIE 5213, Liquid Crystals VII, (5 January 2004); doi: 10.1117/12.505916; https://doi.org/10.1117/12.505916
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