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

Source: CHINESE PHYSICS B Volume: 30 Issue: 10 Article Number: 104201 DOI: 10.1088/1674-1056/abec30 Published: OCT 2021

Abstract: A multimode interference (MMI) structure is designed to simplify the fabrication of quantum cascade laser (QCL) phase-locked arrays. The MMI geometry is optimized with a sufficient output channel distance to accommodate conventional photolithography and wet etching process by which power amplifier array is fabricated without using the complicated two-step etching-regrowth or dry etching technique. The far-field pattern with periodically modulated peaks reveals that the beams from the arrays are phase-locked. Furthermore, the frequency tuning performance of the MMI-based phase-locked arrays is studied using the Littrow-configuration external cavity structure. A wavelength tuning range of more than 60 cm(-1) is demonstrated, which will eventually realize the high power, frequency tunable, large-scale phase-locked arrays, and their application in spectroscopy.

Accession Number: WOS:000707211400001

ISSN: 1674-1056

eISSN: 2058-3834

Full Text: https://iopscience.iop.org/article/10.1088/1674-1056/abec30