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1 April 2022 High-power terahertz parametric generator using a cascade process
Sota Mine, Kodo Kawase, Kosuke Murate
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Proceedings Volume PC11985, Nonlinear Frequency Generation and Conversion: Materials and Devices XXI; PC119850M (2022) https://doi.org/10.1117/12.2607940
Event: SPIE LASE, 2022, San Francisco, California, United States
Abstract
We achieved to extract terahertz (THz)-waves generated by cascade process (i.e., higher-order THz-waves) in an injection-seeded THz parametric generator (is-TPG), and realized higher-power output. Because of the angular phase-matching condition, the higher-order THz-waves are generated deep in a crystal and extraction of them from the crystal was difficult due to the large absorption loss. In our setup, we used total reflection of the pump beam on the crystal surface to reduce absorption loss, and optimized the THz focusing lens and the position of Si-prism coupler. As a result, we succeeded in extracting higher-order THz waves and improved the output power.
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Sota Mine, Kodo Kawase, and Kosuke Murate "High-power terahertz parametric generator using a cascade process", Proc. SPIE PC11985, Nonlinear Frequency Generation and Conversion: Materials and Devices XXI, PC119850M (1 April 2022); https://doi.org/10.1117/12.2607940
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KEYWORDS
Crystals
Laser crystals
Terahertz radiation
Absorption
Free space
Nd:YAG lasers
Reflection
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