Author(s): Wang, H (Wang, Huan); Zhang, JC (Zhang, Jin-Chuan); Cheng, FM (Cheng, Feng-Min); Gu, ZH (Gu, Zeng-Hui); Zhuo, N (Zhuo, Ning); Zhai, SQ (Zhai, Shen-Qiang); Liu, FQ (Liu, Feng-Qi); Liu, JQ (Liu, Jun-Qi); Liu, SM (Liu, Shu-Man); Wang, ZG (Wang, Zhan-Guo)

Source: CHINESE PHYSICS B Volume: 30 Issue: 12 Article Number: 124202 DOI: 10.1088/1674-1056/abf91a Published: DEC 2021

Abstract: 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.

Accession Number: WOS:000732449400001

ISSN: 1674-1056

eISSN: 2058-3834

Full Text: https://iopscience.iop.org/article/10.1088/1674-1056/abf91a