Abstract
The first observation of optical bistability in smectic A liquid crystals is reported. This was achieved with a 5 mW helium-neon laser in a dielectric mirror/metal mirror Fabry-Perot cavity. The switching power was found to be 360 to 420 mW (in a 30 μm diameter spot) depending on the relative orientation of the plane of polarisation and the long molecular axes.
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