1. K 2 CdGe 3 S 8 : A New Infrared Nonlinear Optical Sulfide.
- Author
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Wu, Zi-Xuan, Chen, Wen-Fa, Liu, Bin-Wen, Jiang, Xiao-Ming, and Guo, Guo-Cong
- Subjects
BAND gaps ,SULFIDES ,SPACE groups ,NONLINEAR optical materials - Abstract
A quaternary metal chalcogenide, namely K
2 CdGe3 S8 (I), is obtained through a high-temperature solid-state approach. Compound I crystallizes with the non-centrosymmetric space group P21 21 21 . It features a 2D layer structure with [CdGe3 S8 ] layers consisting of tetrahedral GeS4 and CdS4 units, and counter K+ embedded between the layers. The compound exhibits a powder second-harmonic generation (SHG) response of ~0.1 times that of KH2 PO4 (KDP) with phase-matchable character at the laser wavelength of 1064 nm. Remarkably, it has a wide band gap (3.20 eV), which corresponds to a favorable high laser-induced damage threshold of 6.7 times that of AgGaS2 . In addition, the calculated birefringence (Δn) is 0.039 at the wavelength of 1064 nm, which satisfies the Δn criteria for a promising infrared NLO material. [ABSTRACT FROM AUTHOR]- Published
- 2023
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