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Based upon the ab initio band structure calculations results and the density of states function of the orthorhombic In4Se3 crystal as well as the experimental data concerning its radiative recombination, it was shown that the Bernard-Durafour condition is fulfilled for this crystal. The absorption coefficient alpha that exhibits a negative value in the given energy range and for the given concentrations of non-equilibrium charge carriers, was calculated.

Gain Spectrum for the In4Se3Crystal with a Non-Standard Dispersion Law of Charge Carriers

Gain Spectrum for the In₄Se₃Crystal with a Non-Standard Dispersion Law of Charge Carriers