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9 March 2024 An external cavity nonlinear quantum cascade laser with high mid-infrared to terahertz conversion efficiency in the frequency of 1.2-4.5 THz tuning range
Shohei Hayashi, Atsushi Nakanishi, Tatsuo Dougakiuchi, Akio Ito, Masahiro Hitaka, Kazuue Fujita
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Proceedings Volume PC12895, Quantum Sensing and Nano Electronics and Photonics XX; PC128950F (2024) https://doi.org/10.1117/12.3001178
Event: SPIE OPTO, 2024, San Francisco, California, United States
Abstract
A broadly tunable THz nonlinear QCLs with enhanced conversion efficiency by employing a homogeneous active region is demonstrated. Using an external cavity configuration, the device has achieved tunability from 1.2 THz to 4.5 THz in the operating frequency range. The single dual-upper-state structure with wide gain bandwidth and a high nonlinear susceptibility χ2 enables to realize two-wavelength oscillations without stacking active regions and significantly improves the mid-infrared to THz conversion efficiency, resulting in superior performance over previously reported frequency tunable devices. The device has achieved a conversion efficiency of ~3 mW/W2 around 3.5 THz. In the presentation, spectroscopic measurements using this device will also be reported.
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(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Shohei Hayashi, Atsushi Nakanishi, Tatsuo Dougakiuchi, Akio Ito, Masahiro Hitaka, and Kazuue Fujita "An external cavity nonlinear quantum cascade laser with high mid-infrared to terahertz conversion efficiency in the frequency of 1.2-4.5 THz tuning range", Proc. SPIE PC12895, Quantum Sensing and Nano Electronics and Photonics XX, PC128950F (9 March 2024); https://doi.org/10.1117/12.3001178
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KEYWORDS
Terahertz radiation
Quantum cascade lasers
Mid-IR
Laser frequency
Quantum frequencies
External quantum efficiency
Quantum conversion
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