Open AccessPhase-locked terahertz quantum cascade laser array integrated with a Talbot cavity
Author(s) -
Yunfei Xu,
Yongqiang Sun,
Weijiang Li,
Yu Ma,
Ning Zhuo,
Junqi Liu,
jinchuan zhang,
Shenqiang Zhai,
Shuman Liu,
Lijun Wang,
Fengqi Liu
Publication year - 2022
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.470993
Subject(s) - optics , terahertz radiation , quantum cascade laser , cascade , photomixing , laser , talbot effect , optoelectronics , materials science , laser beam quality , physics , far infrared laser , laser beams , chemistry , terahertz metamaterials , chromatography , grating
Increasing the power of a quantum cascade laser by widening laser ridges will lead to the degradation of the beam quality because of the operation of high-order transverse modes. We report on a phase-locked array scheme of terahertz quantum cascade laser (THz QCL) utilizing Talbot effect. By adjusting the absorbing boundary width of each ridge in the array, stable operation of the fundamental supermode is realized. A five-element array shows 4 times power amplification than that of a single ridge device. Due to the large power amplification efficiency, stable mode selection, and simple fabricating process, the phase-locked array scheme is very promising to further improve the performance of THz QCL.