Preparation and Spectroscopic Investigation of Diffusion-Doped Fe~(2+):ZnSe and Cr~(2+):ZnSe

摘要

We describe the preparation and spectroscopic characterization of diffusion-doped Fe~(2+):ZnSe and Cr~(2+):ZnSe. A three-dimensional diffusion model was developed and by using experimental absorption data, diffusion coefficients of Cr~(2+) and Fe~(2+) were determined at 1000℃. Position-dependent absorption data were further used to determine the temperature dependence of the diffusion coefficient for Cr~(2+) in the 800-1100℃ temperature range. Spectroscopic measurements show that fluorescence efficiency and emission lifetime decrease monotonically with increasing ion concentration in Cr:ZnSe. Finally, a pulsed optical parametric oscillator operating at 1570 nm was used to make lasing efficiency measurements in Cr:ZnSe. In gain-switched operation, 80-μJ, 1-kHz pulses were produced near 2600 nm with Cr~(2+):ZnSe samples.