Synthesis and characterization of diffusion-doped Cr~(2+):ZnSe and Fe~(2+):ZnSe

摘要

This paper provides a detailed description of the preparation and characterization of diffusion-doped Cr~(2+):ZnSe and Fe~(2+):ZnSe. In the experiments, Cr~(2+):ZnSe samples with peak absorption coefficients (1775 nm) of as high as 74 cm~(-1) and fairly good spatial uniformity were obtained. In the case of Fe~(2+):ZnSe, samples with a maximum absorption coefficient of 11.6 cm~(-1) at 2400 nm were synthesized. A three-dimensional analytical diffusion model was further developed to determine the diffusion coefficient D from absorption data. At 1000°C, D was determined to be 5.4 x 10~(-10) cm~2/s and 7.95 x 10~(-10) cm~2/s for Cr~(2+):ZnSe and Fe~(2+):ZnSe, respectively. In the case of Cr~(2+):ZnSe, we employed an alternative technique to determine the diffusion coefficient from position-dependent absorption data taken with a Cr~(4+):YAG laser. With this method, the temperature variation of D was further measured in the 800-1100°C temperature ranges.