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Title: Terahertz emission from a femtosecond laser focus in a two-color scheme

Abstract

We critically revise the theory of terahertz emission from a plasma filament induced in a gas media by one or two focusd femtosecond laser pulses. We distinguish a radiation pressure force (RPF) from a ponderomotive force (PF), discuss conditions for one of these forces to be the dominating contribution to the terahertz emission, and also show that the angular distribution of the emitted power critically depends on which of the two forces dominates in a particular experiment. We show that the experimentally observed periodic dependence of the emitted terahertz power on the gas pressure reveals the dominating role of the RPF over the PF, whereas the angular diagram of the emission allows us to determine the predominant direction of the force. We also emphasize that the terahertz emission originated by a transient photocurrent exhibits a different dependency from the phase difference between the first and the second harmonics of the optic laser field, which generally enables the experimental detection of the prevailing mechanism of the terahertz emission from the plasma filament.

Authors:
; ;  [1];  [2]
  1. Department of Physics and International Laser Center, M. V. Lomonosov Moscow State University, Leninskie Gory GSP-1, Moscow 119992 (Russian Federation)
  2. Budker Institute of Nuclear Physics, Lavrentyev Avenue 11, Novosibirsk 630090 (Russian Federation)
Publication Date:
OSTI Identifier:
22046835
Resource Type:
Journal Article
Journal Name:
Journal of the Optical Society of America. Part B, Optical Physics
Additional Journal Information:
Journal Volume: 27; Journal Issue: 1; Other Information: (c) 2009 Optical Society of America; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0740-3224
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ANGULAR DISTRIBUTION; COLOR; FOCUSING; HARMONICS; LASER RADIATION; LASER-PRODUCED PLASMA; LASERS; LIGHT TRANSMISSION; MIXING; PERIODICITY; PHOTON EMISSION; PLASMA FILAMENT; PONDEROMOTIVE FORCE; PULSED IRRADIATION; RADIATION PRESSURE; THZ RANGE; TRANSIENTS

Citation Formats

Balakin, Alexey V, Borodin, Alexander V, Shkurinov, Alexander P, and Kotelnikov, Igor A. Terahertz emission from a femtosecond laser focus in a two-color scheme. United States: N. p., 2010. Web. doi:10.1364/JOSAB.27.000016.
Balakin, Alexey V, Borodin, Alexander V, Shkurinov, Alexander P, & Kotelnikov, Igor A. Terahertz emission from a femtosecond laser focus in a two-color scheme. United States. https://doi.org/10.1364/JOSAB.27.000016
Balakin, Alexey V, Borodin, Alexander V, Shkurinov, Alexander P, and Kotelnikov, Igor A. Fri . "Terahertz emission from a femtosecond laser focus in a two-color scheme". United States. https://doi.org/10.1364/JOSAB.27.000016.
@article{osti_22046835,
title = {Terahertz emission from a femtosecond laser focus in a two-color scheme},
author = {Balakin, Alexey V and Borodin, Alexander V and Shkurinov, Alexander P and Kotelnikov, Igor A},
abstractNote = {We critically revise the theory of terahertz emission from a plasma filament induced in a gas media by one or two focusd femtosecond laser pulses. We distinguish a radiation pressure force (RPF) from a ponderomotive force (PF), discuss conditions for one of these forces to be the dominating contribution to the terahertz emission, and also show that the angular distribution of the emitted power critically depends on which of the two forces dominates in a particular experiment. We show that the experimentally observed periodic dependence of the emitted terahertz power on the gas pressure reveals the dominating role of the RPF over the PF, whereas the angular diagram of the emission allows us to determine the predominant direction of the force. We also emphasize that the terahertz emission originated by a transient photocurrent exhibits a different dependency from the phase difference between the first and the second harmonics of the optic laser field, which generally enables the experimental detection of the prevailing mechanism of the terahertz emission from the plasma filament.},
doi = {10.1364/JOSAB.27.000016},
url = {https://www.osti.gov/biblio/22046835}, journal = {Journal of the Optical Society of America. Part B, Optical Physics},
issn = {0740-3224},
number = 1,
volume = 27,
place = {United States},
year = {2010},
month = {1}
}