Phase-locked array of quantum cascade lasers with an integrated Talbot cavity

We show a phase-locked array of three quantum cascade lasers with an integrated Talbot cavity at one side of the laser array. The coupling scheme is called diffraction coupling. By controlling the length of Talbot to be a quarter of Talbot distance (Zt/4), in-phase mode operation can be selected. Th...

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Published inarXiv.org
Main Authors Wang, Lei, Zhang, Jin-Chuan, Zhi-Wei, Jia, Zhao, Yue, Chuan-Wei, Liu, Ying-Hui, Liu, Shen-Qiang Zhai, Zhuo, Ning, Feng-Qi, Liu, Xian-Gang Xu
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 17.12.2016
Subjects
Coupling
Far fields
Laser arrays
Laser beams
Lobes
Physics - Mesoscale and Nanoscale Physics
Physics - Optics
Quantum cascade lasers
Sidelobes
Threshold currents
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Summary:We show a phase-locked array of three quantum cascade lasers with an integrated Talbot cavity at one side of the laser array. The coupling scheme is called diffraction coupling. By controlling the length of Talbot to be a quarter of Talbot distance (Zt/4), in-phase mode operation can be selected. The in-phase operation shows great modal stability under different injection currents, from the threshold current to the full power current. The far-field radiation pattern of the in-phase operation contains three lobes, one central maximum lobe and two side lobes. The interval between adjacent lobes is about 10.5{\deg}. The output power is about 1.5 times that of a single-ridge laser. Further studies should be taken to achieve better beam performance and reduce optical losses brought by the integrated Talbot cavity.
ISSN:2331-8422
DOI:10.48550/arxiv.1609.08790