25 February 2014 Reduction of phase temporal fluctuations caused by digital voltage addressing in LC SLM "HoloEye PLUTO VIS" for holographic applications
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Phase liquid crystal spatial light modulators (LC SLM) are widely used in optical applications such as real-time imaging of holograms and diffractive optical elements, which require high stability and linearity of phase modulation. However state of the art LC SLM with high resolution use digital voltage addressing scheme which, unfortunately, leads to phase fluctuations in time period of one frame. Fluctuations characteristics depend on SLM voltage addressing sequence used. We report results of measurement of phase characteristics of LC SLM “HoloEye PLUTO VIS”. This SLM is supplied with three different addressing sequences: “18-6”, “5-5” and “0-6”. Dynamics of phase fluctuations were measured for all signal values (0-255) with temporal resolution of 0.5 ms in time period of one frame for available addressing sequences. Default sequence “18-6” provided phase deviation 0.24 pi. Lowest deviation 0.07 pi was achieved with sequence “0-6”. Due to high periodicity of fluctuations it is possible to implement synchronization of SLM and registering camera or light source to reduce fluctuation effects. This was experimentally implemented using DVI video signal for synchronization of SLM and camera. With its application minimum phase deviation 0.013 pi was achieved with sequence “18-6” which is 5 times lower than achievable without synchronization.
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Pavel A. Cheremkhin, Pavel A. Cheremkhin, Nikolay N. Evtikhiev, Nikolay N. Evtikhiev, Vitaly V. Krasnov, Vitaly V. Krasnov, Vladislav G. Rodin, Vladislav G. Rodin, Sergey N. Starikov, Sergey N. Starikov, "Reduction of phase temporal fluctuations caused by digital voltage addressing in LC SLM "HoloEye PLUTO VIS" for holographic applications", Proc. SPIE 9006, Practical Holography XXVIII: Materials and Applications, 900615 (25 February 2014); doi: 10.1117/12.2037569; https://doi.org/10.1117/12.2037569

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