Flat liquid jet as a highly efficient source of terahertz radiation


Polar liquids are strong absorbers of electromagnetic waves in the terahertz range, therefore, historically such liquids have not been considered as good candidates for terahertz sources. However, flowing liquid medium has explicit advantages, such as a higher damage threshold compared to solid-state sources and more efficient ionization process compared to gases. Here we report systematic study of efficient generation of terahertz radiation in flat liquid jets under sub-picosecond single-color optical excitation. We demonstrate how medium parameters such as molecular density, ionization energy and linear absorption contribute to the terahertz emission from the flat liquid jets. Our simulation and experimental measurements reveal that the terahertz energy has quasi-quadratic dependence on the optical excitation pulse energy. Moreover, the optimal pump pulse duration, which depends on the thickness of the jet is theoretically predicted and experimentally confirmed. The obtained optical-to-terahertz energy conversion efficiency is more than 0.05%. It is comparable to the commonly used optical rectification in most of electro-optical crystals and two-color air filamentation. These results, significantly advancing prior research, can be successfully applied to create a new alternative source of terahertz radiation.

Publication DOI: https://doi.org/10.1364/OE.27.015485
Divisions: College of Engineering & Physical Sciences
College of Engineering & Physical Sciences > Aston Institute of Photonics Technology (AIPT)
Funding Information: Russian Science Foundation (RSF) (19-12-00097); Army Research Office (W911NF-17-1-0428).
Additional Information: © 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Uncontrolled Keywords: Atomic and Molecular Physics, and Optics
Publication ISSN: 1094-4087
Last Modified: 22 Apr 2024 07:23
Date Deposited: 17 Jun 2019 14:22
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Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
https://www.osa ... =oe-27-11-15485 (Publisher URL)
PURE Output Type: Article
Published Date: 2019-05-15
Accepted Date: 2019-05-09
Authors: Tcypkin, Anton N.
Ponomareva, Evgenia A.
Putilin, Sergey E.
Smirnov, Semen V. (ORCID Profile 0000-0002-8562-2452)
Shtumpf, Sviatoslav A.
Melnik, Maksim V.
Yiwen, E.
Kozlov, Sergei A.
Zhang, Xi Cheng



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