Continuous-wave microcavity quantum cascade lasers in whispering-gallery modes up to 50 °C

Micro-resonator-based lasers are well suited for high-density optoelectronic integration because of their small volumes and low thresholds. However, microcavity quantum cascade lasers for on-chip sensing have high thermal loads that make continuous-wave operation challenging. In this work, we design...

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Published inOptics express Vol. 30; no. 13; pp. 22671 - 22678
Main Authors Guo, Qiangqiang, Zhang, Jinchuan, Yin, Ran, Zhuo, Ning, Lu, Quanyong, Zhai, Shenqiang, Liu, Junqi, Wang, Lijun, Liu, Shuman, Liu, Fengqi
Format Journal Article
LanguageEnglish
Published 20.06.2022
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Summary:Micro-resonator-based lasers are well suited for high-density optoelectronic integration because of their small volumes and low thresholds. However, microcavity quantum cascade lasers for on-chip sensing have high thermal loads that make continuous-wave operation challenging. In this work, we designed an selective thermal dissipation scheme for the selective electrical isolation process to improve the thermal conductivity of the devices. The lasers operated at 50 °C, with 4.7-µm emission. They were fabricated as a notched elliptical resonator, resulting in a highly unidirectional far-field profile with an in-plane beam divergence of 1.9°. Overall, these directional-emission quantum cascade lasers pave the way for portable and highly integrated sensing applications.
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ISSN:1094-4087
1094-4087
DOI:10.1364/OE.458589