Study of two color THz generation with sub-and terawatt laser filament at low pressure gas

M. M. Nazarov; A. A. Garmatina; A. V. Mitrofanov; D. A. Sidorov-Biryukov; P. A. Shcheglov; M. V. Chasсhin; V. M. Gordienko; V. Ya. Panchenko

doi:10.1117/12.2580653

17 November 2020 Study of two color THz generation with sub-and terawatt laser filament at low pressure gas

M. M. Nazarov, A. A. Garmatina, A. V. Mitrofanov, D. A. Sidorov-Biryukov, P. A. Shcheglov, M. V. Chasсhin, V. M. Gordienko, V. Ya. Panchenko

Author Affiliations +

Proceedings Volume 11582, Fourth International Conference on Terahertz and Microwave Radiation: Generation, Detection, and Applications; 115821A (2020) https://doi.org/10.1117/12.2580653
Event: Fourth International Conference on Terahertz and Microwave Radiation: Generation, Detection, and Applications, 2020, Tomsk, Russian Federation

Abstract

THz generation under two-color four-photon interaction of femtosecond TiSa laser radiation in a low-pressure nitrogen at sub-and terawatt power levels has been studied. Method for characterizing the parameters of a femtosecond filament formed in a low-pressure gas based on the average ablation rate and X-ray output from a solid-state target interacting with the filament was developed. In sub-terawatt laser power it was found that under the condition P/P_cr=const, the pressure decrease and the energy increase within 10 times correspond to enhance in the average ablation rate by 2 times and an increase in the fluence and intensity by about 3 times. Under terawatt laser power, energy density in the filament is about 15 J/cm², the intensity is 2.5*10¹⁴W/cm2, and the THz signal reaches a maximum at a nitrogen pressure of 10 mbar (this corresponds to the 3P_cr regime) and is of the order of 1300 nJ.

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M. M. Nazarov, A. A. Garmatina, A. V. Mitrofanov, D. A. Sidorov-Biryukov, P. A. Shcheglov, M. V. Chasсhin, V. M. Gordienko, and V. Ya. Panchenko "Study of two color THz generation with sub-and terawatt laser filament at low pressure gas", Proc. SPIE 11582, Fourth International Conference on Terahertz and Microwave Radiation: Generation, Detection, and Applications, 115821A (17 November 2020); https://doi.org/10.1117/12.2580653

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