Near infrared photorefractive self focusing in Sn(2)P(2)S(6):Te crystals.

ABSTRACT

The experimental observation of photorefractive self focusing in Sn(2)P(2)S(6) Te bulk crystals at 1.06 mum wavelength is presented. Steady state self focusing is reached as fast as 15 ms for an input peak intensity equal to 160 W/cm(2). Self focusing is maximum for input peak intensities around 15 W/cm(2) and is decreasing for intensities below and above this value.