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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. Double active region structure 4.7 μm medium wave infrared quantum cascade laser[J]. Chinese Optics. doi: 10.37188/CO.2023-0239
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. Double active region structure 4.7 μm medium wave infrared quantum cascade laser[J]. Chinese Optics. doi: 10.37188/CO.2023-0239

Double active region structure 4.7 μm medium wave infrared quantum cascade laser

doi: 10.37188/CO.2023-0239
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  • Corresponding author: wjdz@scu.edu.cn
  • Received Date: 03 Jan 2024
  • Accepted Date: 13 Mar 2024
  • Available Online: 10 May 2024
  • In the article, we report 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, it 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, the continuous output power of 0.706 W, the fast axis divergence angle of 27.3°, and the slow axis divergence angle of 18.1°. Compared with conventional devices with a single active region structure, the devices with a double active region structure have no degradation in their maximum optical output power, and the beam quality in the slow axis direction of the device has been significantly improved. This work provides another solution for improving the slow axis beam quality of high-power medium wave quantum cascade lasers.

     

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