Chinese Optics Letters, 2011, 9 (6): 061404, Published Online: Apr. 28, 2011
Single-mode surface-emitting distributed feedback quantum-cascade lasers based on hybrid waveguide structure Download: 536次
量子级联激光器 分布反馈 面发射 混合波导 140.5965 Semiconductor lasers, quantum cascade 230.1950 Diffraction gratings 250.7270 Vertical emitting lasers 250.7360 Waveguide modulators
Abstract
Surface-emitting distributed feedback quantum-cascade lasers operating at \lambda \approx 7.8 \mu m are demonstrated. The metal-covered second-order grating is shallow-etched into the surface of a thin InGaAs contact and cladding layer. This forms a hybrid waveguide and used to achieve relatively low waveguide losses and high coupling strengths. The devices exhibit stable single-mode operation from 90 to 130 K with a side mode suppression ratio above 20 dB. A slope efficiency of 194 mW/A is obtained at 90 K, which is twice higher than that of the Fabry-Perot counterpart.
Wanhong Guo, Junqi Liu, Jianyan Chen, Lu Li, Lijun Wang, Fengqi Liu, Zhanguo Wang. Single-mode surface-emitting distributed feedback quantum-cascade lasers based on hybrid waveguide structure[J]. Chinese Optics Letters, 2011, 9(6): 061404.