Broad gain, continuous-wave operation of InP-based quantum cascade laser at λ ～ 11.8 μm*

作者：Wang, Huan; Zhang, Jin-Chuan^*; Cheng, Feng-Min; Gu, Zeng-Hui; Zhuo, Ning; Zhai, Shen-Qiang; Liu, Feng-Qi^*; Liu, Jun-Qi; Liu, Shu-Man; Wang, Zhan-Guo

来源：Chinese Physics B, 2021, 30(12): 124202.

DOI：10.1088/1674-1056/abf91a

• dual-upper-state (DAU)
• quantum cascade lasers
• external cavity
• gas detection

We demonstrate a broad gain, continuous-wave (CW) operation InP-based quantum cascade laser (QCL) emitting at 11.8 mu m with a modified dual-upper-state (DAU) and diagonal transition active region design. A 3 mm cavity length, 16.5 mu m average ridge wide QCL with high-reflection (HR) coatings demonstrates a maximum peak power of 1.07 W at 283 K and CW output power of 60 mW at 293 K. The device also shows a broad and dual-frequency lasing spectrum in pulsed mode and a maximum average power of 258.6 mW at 283 K. Moreover, the full width at half maximum (FWHM) of the electroluminescent spectrum measured at subthreshold current is 2.37 mu m, which indicates a broad gain spectrum of the materials. The tuning range of 1.38 mu m is obtained by a grating-coupled external cavity (EC) Littrow configuration, which is beneficial for gas detection.

• 单位
  中国科学院; 中国科学院大学