skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Threshold laser power density for regime transition of a laser absorption wave in a reduced-density air atmosphere

Abstract

Shadowgraph visualization experiments provide measurements of the threshold laser power density (S{sub th}) for the regime transition of a laser absorption wave generated using a transversely excited atmospheric CO{sub 2} pulse laser with various pulse shapes. Results revealed a great influence of the plasma expansion in the direction lateral to the wave propagation on the regime transition by showing that the threshold increased proportionally to the inverse of the beam cross-sectional radius at which the transition occurred (r{sub f,tr}): S{sub th}=C{sub th}/r{sub f,tr}. The proportionality constant, C{sub th}, was insensitive to air densities of 0.2-1.3 kg/m{sup 3}.

Authors:
; ;  [1];  [2];  [2]
  1. Institute of Fluid Science, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai, Miyagi (Japan)
  2. (Japan)
Publication Date:
OSTI Identifier:
20778844
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 88; Journal Issue: 12; Other Information: DOI: 10.1063/1.2183812; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ABSORPTION; AIR; ATMOSPHERES; CARBON DIOXIDE; DENSITY; LASERS; LIGHT TRANSMISSION; PLASMA; PLASMA DIAGNOSTICS; PLASMA EXPANSION; PLASMA WAVES; POWER DENSITY; PULSE SHAPERS; PULSES; WAVE PROPAGATION

Citation Formats

Mori, Koichi, Komurasaki, Kimiya, Arakawa, Yoshihiro, Department of Advanced Energy, University of Tokyo, Kashiwanohara 5-1-5, Kashiwa, Chiba, and Department of Aeronautics and Astronautics, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo. Threshold laser power density for regime transition of a laser absorption wave in a reduced-density air atmosphere. United States: N. p., 2006. Web. doi:10.1063/1.2183812.
Mori, Koichi, Komurasaki, Kimiya, Arakawa, Yoshihiro, Department of Advanced Energy, University of Tokyo, Kashiwanohara 5-1-5, Kashiwa, Chiba, & Department of Aeronautics and Astronautics, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo. Threshold laser power density for regime transition of a laser absorption wave in a reduced-density air atmosphere. United States. doi:10.1063/1.2183812.
Mori, Koichi, Komurasaki, Kimiya, Arakawa, Yoshihiro, Department of Advanced Energy, University of Tokyo, Kashiwanohara 5-1-5, Kashiwa, Chiba, and Department of Aeronautics and Astronautics, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo. Mon . "Threshold laser power density for regime transition of a laser absorption wave in a reduced-density air atmosphere". United States. doi:10.1063/1.2183812.
@article{osti_20778844,
title = {Threshold laser power density for regime transition of a laser absorption wave in a reduced-density air atmosphere},
author = {Mori, Koichi and Komurasaki, Kimiya and Arakawa, Yoshihiro and Department of Advanced Energy, University of Tokyo, Kashiwanohara 5-1-5, Kashiwa, Chiba and Department of Aeronautics and Astronautics, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo},
abstractNote = {Shadowgraph visualization experiments provide measurements of the threshold laser power density (S{sub th}) for the regime transition of a laser absorption wave generated using a transversely excited atmospheric CO{sub 2} pulse laser with various pulse shapes. Results revealed a great influence of the plasma expansion in the direction lateral to the wave propagation on the regime transition by showing that the threshold increased proportionally to the inverse of the beam cross-sectional radius at which the transition occurred (r{sub f,tr}): S{sub th}=C{sub th}/r{sub f,tr}. The proportionality constant, C{sub th}, was insensitive to air densities of 0.2-1.3 kg/m{sup 3}.},
doi = {10.1063/1.2183812},
journal = {Applied Physics Letters},
number = 12,
volume = 88,
place = {United States},
year = {Mon Mar 20 00:00:00 EST 2006},
month = {Mon Mar 20 00:00:00 EST 2006}
}