Abstract

A quaternary chalcogenide Li2CdGeS4 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 Li2CdGeS4 has been investigated over a wide spectral range (λ=1.0643.3μm) based on second- and third-harmonic generation. The compound has a high damage threshold at λ=1.064μm because of saturable three-photon absorption, and is phase-matchable for λ>1.5μm with χ(2)50pm/V. It also exhibits strong third-order nonlinearity of χ(3)105pm2/V2. Li2CdGeS4 is promising for high-power NLO applications in the broad infrared spectrum.

© 2014 Optical Society of America

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