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Opt Lett. 1998 Oct 1;23(19):1541-3.

Beam steering with two ferroelectric liquid-crystal spatial light modulators.

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Photonics Laboratory, Department of Microelectronics (ED), Chalmers University of Technology, S-412 96 Gothenburg, Sweden.


Ferroelectric liquid-crystal spatial light modulators (FLC SLM's) are binary modulating devices that can be used for flexible beam steering in the microsecond range. Because they are binary, at least 60% of the light power is lost to unwanted diffraction orders, however. We suggest the use of a second FLC SLM, synchronously operating in amplitude-modulating mode, to block the unwanted orders. The proposed beam-steering method is demonstrated in a simple scanner experiment. The efficiency of the suggested beam steerer is independent of the number of steering directions.

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