Citation: | WANG Yu-pei, ZHANG Yu-hang, LUO Xiao-yue, QIAN Chen-hao, CHENG Yang, ZHAO Wu, WEI Zhi-xiang, HAN Di-yi, SUN Fang-yuan, WANG Jun, ZHOU Da-yong. 4.7 μm mid-wave infrared quantum cascade laser with double active region structure[J]. Chinese Optics. doi: 10.37188/CO.2023-0239 |
This paper reports a 4.7-μm mid-wave infrared quantum cascade laser based on double active regions, with a ridge width of 9.5 μm. It can achieve continuous single transverse mode operation at room temperature. By inserting 0.8-μm InP, the original single active region is transformed into a double active region structure, which can significantly reduce the peak temperature of the device's active region and suppress the generation of higher-order transverse modes. At a temperature of 288 K, the device with a double active region structure with a cavity length of 5 mm has a threshold current density of 1.14 kA/cm2, a continuous output power of 0.706 W, a fast axis divergence angle of 27.3°, and a slow axis divergence angle of 18.1°. The devices with a double active region structure have no degradation in their maximum optical output power and show a significant improvement in the beam quality in the slow axis direction of the device when compared with conventional devices with a single active region structure. These results provide a solution to the problem of the slow axis beam quality of high-power medium wave quantum cascade lasers.
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