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Title: Study of self-diffraction from laser generated plasma gratings in the nanosecond regime

Abstract

We investigate the formation and diffraction efficiency of plasma gratings generated by the interference of two laser beams crossing at a small angle on the surface of a planar aluminum target. Such gratings were observed during National Ignition Facility experiments with the ratio of energy in the first-order to zeroth order of ≈60%. Recently, additional experiments were performed on the Optical Sciences Laser. These experiments with only two interfering beams showed high normalized energy (ratio of energy in diffracted order to zeroth order) of approximately 10% and 3% at the first and second diffracted order locations, respectively, for intensities less than 1012 W/cm2. The existence of the higher-orders is the characteristic of diffraction from gratings in the Raman-Nath as opposed to the Bragg regime. In addition, we show conical diffraction from the generated plasma grating. Using numerical simulations, we explore the large difference in diffraction efficiency observed in these two experiments and highlight the role of plasma temperature and density scale length. The simulations suggest a modulation depth of the plasma grating refractive index ranging from 1.77×10-4 to 3.5×10-2. These results are relevant to Inertial Confinement Fusion experiments or plasma photonics applications of gratings in high-field laser-physics and high-energy densitymore » science, specifically in the nanosecond regime.« less

Authors:
 [1]; ORCiD logo [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1638009
Alternate Identifier(s):
OSTI ID: 1545414
Report Number(s):
LLNL-JRNL-763069
Journal ID: ISSN 1070-664X;1089-7674; 950368; TRN: US2201700
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 26; Journal Issue: 7; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Lasers; Plasma temperature; Photonics; Plasma waves; Laser physics; Plasma confinement; Laser plasma interactions; Hydrodynamics simulations

Citation Formats

Schrauth, S. E., Colaitis, A., Luthi, R. L., Plummer, R. C. W., Hollingsworth, W. G., Carr, C. W., Norton, M. A., Wallace, R. J., Hamza, A. V., MacGowan, B. J., Shaw, M. J., Spaeth, M. L., Manes, K. R., Michel, P., and Di Nicola, J.-M. Study of self-diffraction from laser generated plasma gratings in the nanosecond regime. United States: N. p., 2019. Web. doi:10.1063/1.5087734.
Schrauth, S. E., Colaitis, A., Luthi, R. L., Plummer, R. C. W., Hollingsworth, W. G., Carr, C. W., Norton, M. A., Wallace, R. J., Hamza, A. V., MacGowan, B. J., Shaw, M. J., Spaeth, M. L., Manes, K. R., Michel, P., & Di Nicola, J.-M. Study of self-diffraction from laser generated plasma gratings in the nanosecond regime. United States. https://doi.org/10.1063/1.5087734
Schrauth, S. E., Colaitis, A., Luthi, R. L., Plummer, R. C. W., Hollingsworth, W. G., Carr, C. W., Norton, M. A., Wallace, R. J., Hamza, A. V., MacGowan, B. J., Shaw, M. J., Spaeth, M. L., Manes, K. R., Michel, P., and Di Nicola, J.-M. Mon . "Study of self-diffraction from laser generated plasma gratings in the nanosecond regime". United States. https://doi.org/10.1063/1.5087734. https://www.osti.gov/servlets/purl/1638009.
@article{osti_1638009,
title = {Study of self-diffraction from laser generated plasma gratings in the nanosecond regime},
author = {Schrauth, S. E. and Colaitis, A. and Luthi, R. L. and Plummer, R. C. W. and Hollingsworth, W. G. and Carr, C. W. and Norton, M. A. and Wallace, R. J. and Hamza, A. V. and MacGowan, B. J. and Shaw, M. J. and Spaeth, M. L. and Manes, K. R. and Michel, P. and Di Nicola, J.-M.},
abstractNote = {We investigate the formation and diffraction efficiency of plasma gratings generated by the interference of two laser beams crossing at a small angle on the surface of a planar aluminum target. Such gratings were observed during National Ignition Facility experiments with the ratio of energy in the first-order to zeroth order of ≈60%. Recently, additional experiments were performed on the Optical Sciences Laser. These experiments with only two interfering beams showed high normalized energy (ratio of energy in diffracted order to zeroth order) of approximately 10% and 3% at the first and second diffracted order locations, respectively, for intensities less than 1012 W/cm2. The existence of the higher-orders is the characteristic of diffraction from gratings in the Raman-Nath as opposed to the Bragg regime. In addition, we show conical diffraction from the generated plasma grating. Using numerical simulations, we explore the large difference in diffraction efficiency observed in these two experiments and highlight the role of plasma temperature and density scale length. The simulations suggest a modulation depth of the plasma grating refractive index ranging from 1.77×10-4 to 3.5×10-2. These results are relevant to Inertial Confinement Fusion experiments or plasma photonics applications of gratings in high-field laser-physics and high-energy density science, specifically in the nanosecond regime.},
doi = {10.1063/1.5087734},
journal = {Physics of Plasmas},
number = 7,
volume = 26,
place = {United States},
year = {Mon Jul 29 00:00:00 EDT 2019},
month = {Mon Jul 29 00:00:00 EDT 2019}
}

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Figures / Tables:

FIG. 1 FIG. 1: The experimental setup of the NIF target chamber for the bare aluminum reflectivity measurement. The 8 beams from Q13B and Q15B interact on the planar aluminum target and the reflection of the beams from Q13B are measured on the NBI plate.

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