Phase-locked array of quantum cascade lasers with an intracavity spatial filter
Abstract
Phase-locking an array of quantum cascade lasers is an effective way to achieve higher output power and beam shaping. In this article, based on Talbot effect, we show a new-type phase-locked array of mid-infrared quantum cascade lasers with an integrated spatial- filtering Talbot cavity. All the arrays show stable in-phase operation from the threshold current to full power current. The beam divergence of the array device is smaller than that of a single-ridge laser. We use the multi-slit Fraunhofer diffraction mode to interpret the far-field radiation profile and give a solution to get better beam quality. The maximum power is just about 5 times that of a single-ridge laser for eleven-laser array device and 3 times for seven-laser array device. Considering the great modal selection ability, simple fabricating process and the potential for achieving better beam quality and smaller cavity loss, this new-type phase-locked array may be a hopeful and elegant solution to get high power or beam shaping.
Cite
@article{arxiv.1611.07644,
title = {Phase-locked array of quantum cascade lasers with an intracavity spatial filter},
author = {Lei Wang and Jinchuan Zhang and Zhiwei Jia and Yue Zhao and Chuanwei Liu and Yinghui Liu and Shenqiang Zhai and Zhuo Ning and Fengqi Liu},
journal= {arXiv preprint arXiv:1611.07644},
year = {2016}
}