Low Power Consumption Distributed-Feedback Quantum Cascade Lasers Operating in Continuous-Wave Mode above 90$^{\circ}\!$C at $\lambda \sim7.2$μm
Yue Zhao, Jin-Chuan Zhang**, Zhi-Wei Jia, Ying-Hui Liu, Ning Zhuo, Shen-Qiang Zhai, Feng-Qi Liu**, Zhan-Guo Wang
Key Lab of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083 Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices, Beijing 100083
Abstract:We report on the design and fabrication of $\lambda\sim 7.2$ μm distributed feedback quantum cascade lasers for very high temperature cw operation and low electrical power consumption. The cw operation is reported above 90$^{\circ}\!$C. For a 2-mm-long and 10-μm-wide laser coated with high-reflectivity on the rear facet, more than 170 mW of output power is obtained at 20$^{\circ}\!$C with a threshold power consumption of 2.4 W, corresponding to 30 mW with a threshold power consumption of 3.9 W at 90$^{\circ}\!$C. Robust single-mode emission with a side-mode suppression ratio above 25 dB is continuously tunable by the heat sink temperature or injection current.