Abstract
A quaternary chalcogenide is an excellent candidate for a nonlinear optical (NLO) material exhibiting wide transparency spanning from its fundamental band edge (3.15 eV) to the terahertz regime (23.5 μm). Strong optical nonlinearity of has been investigated over a wide spectral range () based on second- and third-harmonic generation. The compound has a high damage threshold at because of saturable three-photon absorption, and is phase-matchable for with . It also exhibits strong third-order nonlinearity of . is promising for high-power NLO applications in the broad infrared spectrum.
© 2014 Optical Society of America
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