Shockwave-based THz emission in air

Author:

Huang Hsin-hui,Nagashima Takeshi1ORCID,Hatanaka Koji234

Affiliation:

1. Setsunan University

2. Chang Gung University

3. National Dong-Hwa University

4. Utsunomiya University

Abstract

THz emission in air under the irradiation of a pair of tightly-focused femtosecond laser pulses (800nm, 35fs) with nanosecond time delay and micro-meter spatial offsets is studied with polarization-sensitive THz time-domain spectroscopy and time-resolved imaging. The pre-pulse irradiation induces air-breakdown at its focus, which results in the expansion of shockwave front traveling outward. When the main pulse irradiates such shockwave front far from the pre-pulse focus with nanosecond delay, THz emission intensity was enhanced up to ∼13-times and its linear polarization was aligned along the line between the two focus positions of the pre- and the main pulses which is parallel to the expansion direction of the shockwave front. Asymmetric density profiles of the shockwave fronts prepared by the pre-pulse irradiation define the polarization of THz emission. Mechanisms are discussed from the viewpoint of electron diffusion in such asymmetric density profiles.

Funder

Japan Society for the Promotion of Science

Ministry of Science and Technology, Taiwan

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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