Abstract
We investigated the effect of Cr 2+ concentration on the fluorescence lifetime, fluorescence efficiency, and lasing performance of Cr 2+:ZnSe lasers. In the experiments, polycrystalline Cr 2+:ZnSe samples with concentrations of 0.34 × 10 18–66 × 10 18 ion/cm 3 were prepared by diffusion doping. Spectroscopic measurements performed with Cr 4+:YAG and Tm 3+:fiber lasers show that the fluorescence efficiency decreases monotonically with increasing active ion concentration. Lifetime measurements and lasing characterization were also performed with a pulsed 1570-nm KTP optical parametric oscillator. In gain-switched operation, the highest output energy was obtained with the Cr 2+:ZnSe sample having a Cr 2+ ion concentration of 14 × 10 18 cm −3. The power performance degrades with increasing concentration due to larger passive losses at the lasing wavelength. Furthermore, the pulse build-up time and the output pulsewidth decrease with pump energy and ion concentration. Finally, with a single set of optics, tunable output could be obtained in the 2520–3050 nm wavelength range.
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