Photoinduced Gratings in a Sn2P2S6 Ferroelectric Crystal with the Period Depending on the Optical Pump Powerстатья
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Дата последнего поиска статьи во внешних источниках: 5 июня 2017 г.
Аннотация:The light scattering in the form of ring structures in Sn P S crystals at the propagation of intense laser pump
radiation along the b crystallographic axis is detected. Radiation passing through a crystal is completely scattered
into a cone whose angle increases with the pump power and decreases reversibly with a decrease in this
power. The observed effect can be attributed to a spontaneous increase in the amplitude of photoinduced bulk
diffraction gratings and to the scattering of light on them in the directions where the phase increments of the
photorefractive and diffraction natures compensate each other. A similar type of scattering was observed previously
in other photorefractive crystals, but the appearance of gratings with the period easily varied by varying
the pump power is demonstrated for the first time.