Abstract

A quaternary chalcogenide ${\mathrm{Li}}_2{\mathrm{CdGeS}}_4$ 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 ${\mathrm{Li}}_2{\mathrm{CdGeS}}_4$ has been investigated over a wide spectral range ($\lambda =1.064–3.3\mathrm{\mu m}$) based on second- and third-harmonic generation. The compound has a high damage threshold at $\lambda =1.064\mathrm{\mu m}$ because of saturable three-photon absorption, and is phase-matchable for $\lambda >1.5\mathrm{\mu m}$ with ${\chi }^{(2)}\simeq 50\mathrm{pm}/\mathrm{V}$. It also exhibits strong third-order nonlinearity of ${\chi }^{(3)}\simeq {10}^5{\mathrm{pm}}^2/{\mathrm{V}}^2$. ${\mathrm{Li}}_2{\mathrm{CdGeS}}_4$ is promising for high-power NLO applications in the broad infrared spectrum.

© 2014 Optical Society of America

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