BaCdGeSe4: Synthesis, structure and nonlinear optical properties

In this work, we chose to explore the infrared (IR) nonlinear optical (NLO) materials centering on Cd and Ge elements, and finally synthesized a new IR NLO quaternary selenide BaCdGeSe4. Compound BaCdGeSe4 crystallizes in non-centrosymmetric (NCS) space group Fdd2 (No. 43), and it is built by parallel two-dimensional (2D) anionic [CdGeSe4](2-) layers with the cation Ba2+ embedded between the layers. Under the 2050 nm laser excitation, compound BaCdGeSe4 appears type-I phase-matchable behavior and its second-harmonic generation intensities is about 0.5 times of AgGaS2.

Automated summary

In this study, a new IR NLO quaternary selenide BaCdGeSe4 was synthesized and characterized for its non-centrosymmetric crystal structure. Under 2050 nm laser excitation, BaCdGeSe4 exhibits type-I phase-matchable behavior with second-harmonic generation intensities approximately 0.5 times that of AgGaS2.