Electronic and nonlinear-optical properties of some mixed thiogallates, selenogallates, and tellurogallates as candidates for laser device applications

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Abstract
The refractive index, optical nonlinearity, and other related parameters of some mixed-defect compounds for the first time have been evaluated using the bond-charge model of Levine and the approach of Samanta et al. and the results are compared with available experimental values. We have further discussed the device feasibility and the construction of narrow-band tunable optical filters using these compounds which are very important nowadays for various sophisticated frequency-mixing processes.