Theoretical study of the optical gain characteristics of a Ge1− xSn x alloy for a short-wave infrared laser*
Zhang Dong-Liang, Cheng Bu-Wen†, Xue Chun-Lai, Zhang Xu, Cong Hui, Liu Zhi, Zhang Guang-Ze, Wang Qi-Ming
       
(a) Optical gain spectra of Ge0.922Sn0.078 alloy with four different injected carrier densities and a comparison with Ge. (b) The optical gain and FCA spectra of Ge0.922Sn0.078 alloy simulated with the injected carrier densities of 5 × 1018, 9 × 1018, 2 × 1019 cm−3, respectively. (c) Comparison between optical gain and FCA of Ge0.922Sn0.078 alloy and that of Ge0.9Sn0.1 on an identical injection and n-doping level at room temperature.