Gallium selenide is a nonlinear optical material and photoconductor and it is mainly used for such applications as second harmonic generation of CO₂-lasers, up-conversion of CO₂-laser radiation image into near-IR or visible region, frequencies mixing in the middle IR region, differential frequencies generation (DFG) in the middle IR region from 5.5 to 18.0 µm

Basic properties of GaSe crystal

Structure 62m; a = 3.74 ; c = 15.89 Density 5.03 g/cm3 Mohs hardness 2 Eg, eV 2.02 Refractive indices at 5.3 µm no = 2.8340; ne = 2.4599 Refractive indices at 10.6 µm no = 2.8136; ne = 2.4389 Refractive index at 0.633 µm no= 2.9365

GaSe Procucts

Diameter/Width	5-30 mm (can be elliptical)
Thickness/Length	0.1-40 mm
Orientation	X, Y, Z
Surface quality	Cleaved

Can be mounted in 25.4mm holder