GALLIUM SELENIDE GaSe

Chemical formula: GaSe
Symmetry: -62m
Density (g/cm³): 5.03
Mohs hardness: 1
Transparency range (μm): 0.62 – 20
Optical damage threshold (MW/cm²): 30 (1064 nm, 10 ns)
Refractive index : n_o – 2.97, n_e – 2.74 (0.6328 μm)
Nonlinear coefficients (pm/V): d₂₂ = 54 @10.6 μm
Flatness: λ/6 (546 nm)
Parallelism: 0 arcsec