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13 December 2024 External ring cavity interband cascade lasers for broadband gas sensing
Xiyu Lu, Yanjiao Guan, Ruixuan Sun, Shuman Liu, Fengmin Cheng, Lijun Wang, Ning Zhuo, Jinchuan Zhang, Shenqiang Zhai, Fengqi Liu, Junqi Liu
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Proceedings Volume 13493, AOPC 2024: Infrared Technology and Applications; 1349306 (2024) https://doi.org/10.1117/12.3045528
Event: Applied Optics and Photonics China 2024 (AOPC2024), 2024, Beijing, China
Abstract
A directional coupled emission external ring cavity (ERC) based on an interband cascaded laser (ICL) was designed and manufactured. The laser emitted from the front cavity facet of the Fabry-Perot ICL is vertically incident on the rear cavity facet through the blazed grating and three gold-plated reflection mirrors, thereby forming a closed-loop system. The laser emitted from the front and rear cavity facets form clockwise and counterclockwise traveling waves in ERC, respectively. Since the anti-reflection film coating only on the front cavity facet introduces different losses in two directions, resulting in directional coupling in the clockwise direction. And the 0th-order reflected light generated by the directional coupling light passing through the blazed grating is used as the output light. The emitted laser from the two cavity facets enter the ICL again through ERC, enhancing the gain of the ICL. Therefore, a higher output power and wider tuning range are achieved compared to the traditional external cavity with 0th-order diffracted light as output light. The output power of ERC-ICL is 75% of the output power of the corresponding Fabry-Perot ICL, which is much higher than the output power of Littrow external cavity ICL. And single-mode operation is observed within the tuning range of 163 cm-1 (220nm), which is twice the tuning range of Littrow external cavity.
(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Xiyu Lu, Yanjiao Guan, Ruixuan Sun, Shuman Liu, Fengmin Cheng, Lijun Wang, Ning Zhuo, Jinchuan Zhang, Shenqiang Zhai, Fengqi Liu, and Junqi Liu "External ring cavity interband cascade lasers for broadband gas sensing", Proc. SPIE 13493, AOPC 2024: Infrared Technology and Applications, 1349306 (13 December 2024); https://doi.org/10.1117/12.3045528
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KEYWORDS
Continuous wave operation
Quantum cascade lasers
Reflection
Optical gratings
Beam path
Blazed gratings
Coating
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