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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.
The utility of rDNA internal transcribed spacer (ITS) sequences
separating species of Ulva along the North Brittany coast of France
was investigated. Particular attention was paid to the Ulva species
responsible for ‘green tides’. Floating thalli are difficult
to identify due
to fragmentation and it was not clear at the outset whether one or more
species of Ulva might be contributing to the green tide
phenomenon. Results show that ITS sequences are good markers for Ulva
species and that the Lannion Bay green tide taxon is a
previously unrecognized species that can also be identified on morphological
grounds. We found that ITS type did not necessarily
correspond to the initial identification of a specimen based on morphological
features, due to the lack of good diagnostic characters. This
survey highlights the need for a more intensive survey of Ulva
populations along European coasts. Once ITS groups can be recognized,
quick screening assays can be developed to aid morphological identification.
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