Optical gain in CdIn2S4

Abstract
Photoluminescence measurements in the donor‐acceptor band of single crystals of CdIn2S4 have displayed optical gain under high extrinsic excitation intensities of the order of 108 W/m2. Gain spectra centered around λ=765 mm have been observed yielding a maximum gain of 2.2 cm1 at 300 K and about twice that value at 100 K. The results are correlated with kinetics measurements under varying incident intensity, showing a sharp break in the luminescence decay time at exciting intensities corresponding to the onset of gain.

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