Abstract
Stimulated emission was observed when ZnTe, ZnSe, and CdS single crystals were exposed to two-photon excitation by a train of ruby laser picosecond pulses. The lasing wavelengths for ZnTe, ZnSe, and CdS crystals were 530, 450, and 495 nm, respectively. The angular divergence was 19–21° and the laser action occurred at peak exciting pulse intensities of around 1 GW/cm2.
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