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The scattering properties of polymer dispersed liquid crystal (PDLC) composites are studied and applied to optically addressed devices for the protection against continuous wave laser. The geometry of the device is chosen with respect to its scattering efficiency, linear transmission and response time. The optical limiting performances of this PDLC-based device are measured at 514 nm.
The reconfiguration time of a holographic beam-shaping device using a liquid
crystal spatial light modulator (SLM) has been drastically decreased by five
orders of magnitude to reach the microsecond range (~5 µs). The
method involves an acousto-optic modulator (AOM) placed in front of the SLM
which points the laser beam towards different pre-addressed regions of the
liquid crystal plate. Because the addressing signal is not changed, the
reconfiguration time is mainly governed by the AOM response time. Moreover,
this method allows us to clean up the transient regime by suppressing the bleed
effect usually observed in the standard SLM reconfiguration.
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