ScholarWorks: Characterization of New Infrared Nonlinear Optical Material with High Laser Damage Threshold, Li2Ga2GeS6

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Ionic conducting ceramic electrolyte membranes, energy conversion and storage materials and devices

Characterization of New Infrared Nonlinear Optical Material with High Laser Damage Threshold, Li2Ga2GeS6

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Title: Characterization of New Infrared Nonlinear Optical Material with High Laser Damage Threshold, Li2Ga2GeS6

Author: Kim, Youngsik; Seo, In-Seok; Martin, Steve W.; Baek, Jaewook; Halasyamani, P. Shiv; Arumugam, Nachiappan; Steinfink, Hugo

Keywords: C -axis; Damage thresholds; Germanium sulfides; High-power; Host structures; Infrared; Nd: YAG; New materials; Nlo applications; Nlo materials; Nonlinear optical materials; Second-harmonic generations

Abstract: A new thio-germanium sulfide Li2Ga2GeS6 has been synthesized for the first time and its structure was found to be isomorphous with AgGaGeS4, which is well-known as a promising infrared NLO material. The host structure is built of GaS4 tetrahedra linked by corners to GeS4 tetrahedra to create a 3D framework forming tunnels along the c-axis, in which the Li+ ions are located. The second harmonic generation (SHG) efficiency determined on powders of Li 2Ga2GaS6 is ∼200 times larger than that of α-SiO2. Unlike AgGaS2 and AgGaGeS4, Li2Ga2GeS6 was observed to be very stable under prolonged Nd:YAG 1.064 μm laser pumping, indicative of a large improvement in laser damage threshold. This new material could supplant Ag phases in the next generation of high-power infrared NLO applications.