Non-monotonic wavelength shift of mid-infrared quantum cascade lasers at different temperatures

Zhixiong Duan; Jiachen Yu; Mengdi Zhang; Zhijun Liu

doi:10.1117/12.3030717

3 June 2024 Non-monotonic wavelength shift of mid-infrared quantum cascade lasers at different temperatures

Zhixiong Duan, Jiachen Yu, Mengdi Zhang, Zhijun Liu

Proceedings Volume 13182, 2024 International Conference on Optoelectronic Information and Optical Engineering (OIOE 2024); 131821M (2024) https://doi.org/10.1117/12.3030717
Event: 2024 International Conference on Optoelectronic Information and Optical Engineering (OIOE 2024), 2024, Kunming, China

Abstract

Mid-infrared quantum cascade lasers (QCLs) are a type of unipolar semiconductor device based on intersubband electron transitions. Control over the emission wavelength of QCLs is important in many applications such as free-space communication, medical diagnosis, and trace gas detection. In this study, we report on non-monotonic wavelength shift of mid-infrared QCLs at different temperatures. Our QCLs were fabricated based on lattice-matched InGaAs/AlInAs/InP superlattices grown by metalorganic chemical vapor deposition (MOCVD) technique. By strictly controlling the growth conditions, epitaxial wafers with high interface quality structures were fabricated. Under pulsed operation with 300 ns pulse width and 80 kHz repetition rate, our fabricated QCL with a cavity length of 4 mm and a ridge width of 13 μm emitted 28 mW peak power. As the temperature increased from 78 K to 285 K, the lasing wavelength showed a redshift from 9.27 μm to 9.40 μm first and then a blueshift from 9.40 μm to 9.36 μm. This non-monotonic wavelength shift suggests that, besides temperature-dependent refractive index, extra factors such as mode competition within the laser cavity likely affect emission wavelengths of QCLs.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Zhixiong Duan, Jiachen Yu, Mengdi Zhang, and Zhijun Liu "Non-monotonic wavelength shift of mid-infrared quantum cascade lasers at different temperatures", Proc. SPIE 13182, 2024 International Conference on Optoelectronic Information and Optical Engineering (OIOE 2024), 131821M (3 June 2024); https://doi.org/10.1117/12.3030717

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KEYWORDS

Quantum cascade lasers

Emission wavelengths

Metalorganic chemical vapor deposition

Mid infrared

Waveguides

Temperature metrology

Fabrication

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