Enhancement of high harmonic generation in liquid water by resonant excitation in the mid-infrared

Tianqi Yang; Takayuki Kurihara; Yangyang Hua; Tomoya Mizuno; Teruto Kanai; Satoshi Ashihara; Yoshihisa Harada; Jiro Itatani

doi:10.35848/1882-0786/ad98e2

Applied Physics Express (Jan 2024)

Enhancement of high harmonic generation in liquid water by resonant excitation in the mid-infrared

Tianqi Yang,
Takayuki Kurihara,
Yangyang Hua,
Tomoya Mizuno,
Teruto Kanai,
Satoshi Ashihara,
Yoshihisa Harada,
Jiro Itatani

Affiliations

Tianqi Yang: The Institute for Solid State Physics, The University of Tokyo , 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8582, Japan
Takayuki Kurihara: ORCiD; The Institute for Solid State Physics, The University of Tokyo , 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8582, Japan
Yangyang Hua: ORCiD; The Institute for Solid State Physics, The University of Tokyo , 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8582, Japan
Tomoya Mizuno: ORCiD; The Institute for Solid State Physics, The University of Tokyo , 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8582, Japan
Teruto Kanai: The Institute for Solid State Physics, The University of Tokyo , 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8582, Japan
Satoshi Ashihara: ORCiD; Institute of Industrial Science, The University of Tokyo , 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
Yoshihisa Harada: ORCiD; The Institute for Solid State Physics, The University of Tokyo , 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8582, Japan
Jiro Itatani: ORCiD; The Institute for Solid State Physics, The University of Tokyo , 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8582, Japan

DOI: https://doi.org/10.35848/1882-0786/ad98e2
Journal volume & issue: Vol. 17, no. 12
p. 122006

Abstract

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We study high harmonic generation (HHG) in the visible spectral range generated in a flat liquid jet of H _2 O, excited by intense mid-infrared (MIR) radiation around 3 μm, which is nearly resonant with the OH vibrational modes. By introducing a weak excitation pulse prior to the intense MIR driver pulse for HHG, we observed an enhancement of the 5th, 7th, and 9th harmonics occurring approximately 2 ps after excitation and persisting for more than 120 ps, which is completely absent in the case of non-resonant D _2 O. These results suggest that the enhancement is caused by ultrafast heating through vibrational excitation.

Published in Applied Physics Express

ISSN: 1882-0778 (Print); 1882-0786 (Online)
Publisher: IOP Publishing
Country of publisher: United Kingdom
LCC subjects: Science: Physics
Website: https://iopscience.iop.org/journal/1882-0786

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