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Title: Amplification of an Ultra Short Pulse Laser by Stimulated Raman Scattering in a Low density Plasma Relevant to Pulse Compression

Abstract

Experiments are described in which a 1mJ, 1ps, 1200 nm probe laser beam is amplified by interaction with an intersecting 350 J, 1ns, 1054 nm pump beam in a low density ({approx} 9 x 10{sup 24}/m{sup 3}) plasma. The transmission of the probe beam is observed to be enhanced by >{approx} 25 x when the plasma is near the resonant density for stimulated Raman scattering (SRS), as compared with measured transmissions at wavelengths just above the resonant value. The amplification is observed to increase rapidly with increases in both pump intensity and plasma density.

Authors:
; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
950619
Report Number(s):
UCRL-JRNL-219578
Journal ID: ISSN 1070-664X; PHPAEN; TRN: US0902018
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas, vol. 14, no. 11, November 1, 2007, pp. 113109-1 to 113109-7; Journal Volume: 14; Journal Issue: 11
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 70 PLASMA PHYSICS AND FUSION; AMPLIFICATION; COMPRESSION; LASERS; PLASMA; PLASMA DENSITY; PROBES; SCATTERING; WAVELENGTHS

Citation Formats

Kirkwood, R K, Dewald, E L, Niemann, C, Meezan, N B, Wilks, S C, Price, D W, Landen, O L, Wurtele, J, Charman, A E, Lindberg, R, Fisch, N J, Malkin, V M, and Valeo, E O. Amplification of an Ultra Short Pulse Laser by Stimulated Raman Scattering in a Low density Plasma Relevant to Pulse Compression. United States: N. p., 2006. Web.
Kirkwood, R K, Dewald, E L, Niemann, C, Meezan, N B, Wilks, S C, Price, D W, Landen, O L, Wurtele, J, Charman, A E, Lindberg, R, Fisch, N J, Malkin, V M, & Valeo, E O. Amplification of an Ultra Short Pulse Laser by Stimulated Raman Scattering in a Low density Plasma Relevant to Pulse Compression. United States.
Kirkwood, R K, Dewald, E L, Niemann, C, Meezan, N B, Wilks, S C, Price, D W, Landen, O L, Wurtele, J, Charman, A E, Lindberg, R, Fisch, N J, Malkin, V M, and Valeo, E O. Wed . "Amplification of an Ultra Short Pulse Laser by Stimulated Raman Scattering in a Low density Plasma Relevant to Pulse Compression". United States. doi:. https://www.osti.gov/servlets/purl/950619.
@article{osti_950619,
title = {Amplification of an Ultra Short Pulse Laser by Stimulated Raman Scattering in a Low density Plasma Relevant to Pulse Compression},
author = {Kirkwood, R K and Dewald, E L and Niemann, C and Meezan, N B and Wilks, S C and Price, D W and Landen, O L and Wurtele, J and Charman, A E and Lindberg, R and Fisch, N J and Malkin, V M and Valeo, E O},
abstractNote = {Experiments are described in which a 1mJ, 1ps, 1200 nm probe laser beam is amplified by interaction with an intersecting 350 J, 1ns, 1054 nm pump beam in a low density ({approx} 9 x 10{sup 24}/m{sup 3}) plasma. The transmission of the probe beam is observed to be enhanced by >{approx} 25 x when the plasma is near the resonant density for stimulated Raman scattering (SRS), as compared with measured transmissions at wavelengths just above the resonant value. The amplification is observed to increase rapidly with increases in both pump intensity and plasma density.},
doi = {},
journal = {Physics of Plasmas, vol. 14, no. 11, November 1, 2007, pp. 113109-1 to 113109-7},
number = 11,
volume = 14,
place = {United States},
year = {Wed Feb 08 00:00:00 EST 2006},
month = {Wed Feb 08 00:00:00 EST 2006}
}
  • Experiments are described in which a 1mJ, 1ps, 1200 nm seed laser beam is amplified by interaction with an intersecting 350 J, 1ns, 1054 nm pump beam in a low density (1 x 10{sup 19}/cm{sup 3}) plasma. The transmission of the seed beam is observed to be enhanced by > {approx} 25 x when the plasma is near the resonant density for stimulated Raman scattering (SRS), compared to measured transmissions at wavelengths just below the resonant value. The amplification is observed to increase rapidly with increases in both pump intensity and plasma density.
  • Experiments are described in which a 1 mJ, 1 ps, 1200 nm seed laser beam is amplified by the interaction with an intersecting 350 J, 1 ns, 1054 nm pump beam in a low density (1x10{sup 19}/cm{sup 3}) plasma. The transmission of the seed beam is observed to be enhanced by > or approx. 25x when the plasma is near the resonant density for stimulated Raman scattering, compared to measured transmissions at wavelengths just below the resonant value. The amplification is observed to increase rapidly with increases in both pump intensity and plasma density.
  • The evolution of sideward stimulated Raman scattering (SRS), in time and two spatial dimensions, is studied analytically for boundary conditions representative of a laser pulse propagating in a plasma channel. The partial reflection of Stokes light by the channel walls allows a spatial eigenmode to form in the body of the pulse. After this eigenmode has formed, it grows exponentially in time for the subsequent duration of the pulse. Even weak reflections enhance the growth of sideward SRS significantly. {copyright} {ital 1997} {ital The American Physical Society}
  • Strongly coupled large-angle stimulated Raman scattering (LA SRS) of a short intense laser pulse develops in a plane plasma-filled capillary differently than in a plasma with open boundaries. Coupling the laser pulse to a capillary seeds the LA SRS in the forward direction (scattering angle smaller than {pi}/2) and can thus produce a high instability level in the vicinity of the entrance plane. In addition, oblique mirror reflections off capillary walls partly suppress the lateral convection of scattered radiation and increase the growth rate of the SRS under arbitrary (not too small) angle. Hence, the saturated convective gain falls withmore » an angle much slower than in an unbounded plasma and even for the near-forward SRS can be close to that of the direct backscatter. At a large distance, the LA SRS evolution in the interior of the capillary is dominated by quasi-one-dimensional leaky modes whose damping is related to the leakage of scattered radiation through the walls.« less
  • The spatiotemporal evolution of parametric instabilities such as stimulated Raman scattering is studied analytically in time and two spatial dimensions. Initial and boundary conditions are chosen to represent the entrance, propagation, and exit of a laser pulse of finite extent as it progresses through a homogeneous collisional plasma channel. For most scattering angles daughter wave growth is enhanced by lateral reflections within the channel. At late times the two-dimensional interaction approaches a one-dimensional damped mode in which the dissipative loss from lateral transmission of the Stokes wave through the channel boundaries is equivalent to an overall damping of the Stokesmore » amplitudes within the channel.« less