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Title: Short Pulse Laser Absorption and Energy Partition at Relativistic Laser Intensities

Abstract

We have performed experiments at the COMET and Calisto short pulse laser facilities to make the first comprehensive measurements of the laser absorption and energy partition in solid targets heated with an ultrashort laser pulse focused to relativistic laser intensities (>10 10{sup 17} W/cm{sup 2}). The measurements show an exceedingly high absorption for P polarized laser-target interactions above 10{sup 19} W/cm{sup 2}. Additionally, the hot electron population is observed to markedly increase at the same intensity range. An investigation of the relaxation process was initiated u using time sing time-resolved K{sub {alpha}} spectroscopy. Measurements of the time time-resolved K{sub {alpha}} radiation suggest a 10-20 ps relativistic electron relaxation time. However modeling difficulties of these data are apparent and a more detailed investigation on this subject matter is warranted.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
908084
Report Number(s):
UCRL-TR-229579
TRN: US0703609
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; 42 ENGINEERING; ABSORPTION; COMETS; ELECTRONS; LASERS; RADIATIONS; RELAXATION TIME; SIMULATION; SPECTROSCOPY; TARGETS

Citation Formats

Shepherd, R, Chen, H, Ping, Y, Dyer, G, Wilks, S, Chung, H, Kemp, A, Hanson, S, Widmann, K, Fournier, K, Faenov, A, Pikuz, T, Niles, A, and Beiersdorfer, P. Short Pulse Laser Absorption and Energy Partition at Relativistic Laser Intensities. United States: N. p., 2007. Web. doi:10.2172/908084.
Shepherd, R, Chen, H, Ping, Y, Dyer, G, Wilks, S, Chung, H, Kemp, A, Hanson, S, Widmann, K, Fournier, K, Faenov, A, Pikuz, T, Niles, A, & Beiersdorfer, P. Short Pulse Laser Absorption and Energy Partition at Relativistic Laser Intensities. United States. doi:10.2172/908084.
Shepherd, R, Chen, H, Ping, Y, Dyer, G, Wilks, S, Chung, H, Kemp, A, Hanson, S, Widmann, K, Fournier, K, Faenov, A, Pikuz, T, Niles, A, and Beiersdorfer, P. Tue . "Short Pulse Laser Absorption and Energy Partition at Relativistic Laser Intensities". United States. doi:10.2172/908084. https://www.osti.gov/servlets/purl/908084.
@article{osti_908084,
title = {Short Pulse Laser Absorption and Energy Partition at Relativistic Laser Intensities},
author = {Shepherd, R and Chen, H and Ping, Y and Dyer, G and Wilks, S and Chung, H and Kemp, A and Hanson, S and Widmann, K and Fournier, K and Faenov, A and Pikuz, T and Niles, A and Beiersdorfer, P},
abstractNote = {We have performed experiments at the COMET and Calisto short pulse laser facilities to make the first comprehensive measurements of the laser absorption and energy partition in solid targets heated with an ultrashort laser pulse focused to relativistic laser intensities (>10 10{sup 17} W/cm{sup 2}). The measurements show an exceedingly high absorption for P polarized laser-target interactions above 10{sup 19} W/cm{sup 2}. Additionally, the hot electron population is observed to markedly increase at the same intensity range. An investigation of the relaxation process was initiated u using time sing time-resolved K{sub {alpha}} spectroscopy. Measurements of the time time-resolved K{sub {alpha}} radiation suggest a 10-20 ps relativistic electron relaxation time. However modeling difficulties of these data are apparent and a more detailed investigation on this subject matter is warranted.},
doi = {10.2172/908084},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Feb 27 00:00:00 EST 2007},
month = {Tue Feb 27 00:00:00 EST 2007}
}

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