Problem of optical absorption coefficients change in periodically poled nonlinear-optical crystals

摘要

Variety applications such as laser displaying, entertainment industry, materials processing, defence and astronomy research require high-power lasers at specific wavelengths of visible spectrum range. Frequency conversion of high-power IR laser radiation in nonlinear-optical crystals is one of the most efficient ways to generate high-power visible radiation [1]. Creating artificial inverse polarized domain structure (periodically poling) in nonlinear-optical crystals allows using single-pass second harmonic generation (SHG) scheme for obtaining tens watts of visible radiation [2]. In contrast to conventional phase matching, domain structure enables to employ largest value of nonlinear-optical susceptibility and obtain high conversion efficiency at any given wavelength in transparency range of the crystal.