Laser transport and backscatter in low-density SiO2 and Ta2O5 foams
Abstract
Experiments using a single 527 nm wavelength beam interacting with sub- and supercritical density SiO2 and Ta2O5 foams examined laser propagation and backscatter from laser–plasma instabilities such as Stimulated Brillouin Scattering (SBS). Two densities of each material were examined, and multiple diagnostics were used to characterize the propagation and backscatter. For 5 mg/cc SiO2 (ne/nc = 0.375), the laser propagation distance was well approximated by treating the foam as a gas. However, for the 2 mg/cc SiO2 foam (ne/nc = 0.15), the same model over-predicts the propagation distance by ~40%. Furthermore, existing analytical theories on propagation through subcritical foams were able to account for this difference. The laser heat wave propagated ~1/2 as far in Ta2O5 than SiO2 foams with similar electron density. We showed that this difference is due to the increased radiation losses in the higher Z foam. The fraction of backscattered light scales linearly with incident laser intensity for the range of intensities examined. Ta2O5 foams had significantly lower levels of backscatter (1–3%) than the SiO2 (4–8%), which is consistent with estimates of large Landau damping due to the presence of the oxygen atoms. The measured fraction of SBS backscattered laser energy for a 2 mg/cc SiO2more »
- Authors:
-
- 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 Laboratory Directed Research and Development (LDRD) Program
- OSTI Identifier:
- 1821279
- Alternate Identifier(s):
- OSTI ID: 1759079
- Report Number(s):
- LLNL-JRNL-812654
Journal ID: ISSN 1070-664X; 1019638; TRN: US2214331
- Grant/Contract Number:
- AC52-07NA27344; AC5207NA27344; 15-ERD-039; 17-ERD-118
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 28; Journal Issue: 1; 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; Plasma waves; Foams; Acoustic damping; Hydrodynamic codes; Plasma dynamics; Laser plasma interactions; Bremsstrahlung; Plasma instabilities
Citation Formats
Mariscal, D. A., Jones, O. S., Berger, R. L., Patankar, S., Baker, K. L., Baumann, T. F., Biener, M. M., Goyon, C., Pollock, B. B., Moody, J. D., and Strozzi, D. J. Laser transport and backscatter in low-density SiO2 and Ta2O5 foams. United States: N. p., 2021.
Web. doi:10.1063/5.0025639.
Mariscal, D. A., Jones, O. S., Berger, R. L., Patankar, S., Baker, K. L., Baumann, T. F., Biener, M. M., Goyon, C., Pollock, B. B., Moody, J. D., & Strozzi, D. J. Laser transport and backscatter in low-density SiO2 and Ta2O5 foams. United States. https://doi.org/10.1063/5.0025639
Mariscal, D. A., Jones, O. S., Berger, R. L., Patankar, S., Baker, K. L., Baumann, T. F., Biener, M. M., Goyon, C., Pollock, B. B., Moody, J. D., and Strozzi, D. J. Tue .
"Laser transport and backscatter in low-density SiO2 and Ta2O5 foams". United States. https://doi.org/10.1063/5.0025639. https://www.osti.gov/servlets/purl/1821279.
@article{osti_1821279,
title = {Laser transport and backscatter in low-density SiO2 and Ta2O5 foams},
author = {Mariscal, D. A. and Jones, O. S. and Berger, R. L. and Patankar, S. and Baker, K. L. and Baumann, T. F. and Biener, M. M. and Goyon, C. and Pollock, B. B. and Moody, J. D. and Strozzi, D. J.},
abstractNote = {Experiments using a single 527 nm wavelength beam interacting with sub- and supercritical density SiO2 and Ta2O5 foams examined laser propagation and backscatter from laser–plasma instabilities such as Stimulated Brillouin Scattering (SBS). Two densities of each material were examined, and multiple diagnostics were used to characterize the propagation and backscatter. For 5 mg/cc SiO2 (ne/nc = 0.375), the laser propagation distance was well approximated by treating the foam as a gas. However, for the 2 mg/cc SiO2 foam (ne/nc = 0.15), the same model over-predicts the propagation distance by ~40%. Furthermore, existing analytical theories on propagation through subcritical foams were able to account for this difference. The laser heat wave propagated ~1/2 as far in Ta2O5 than SiO2 foams with similar electron density. We showed that this difference is due to the increased radiation losses in the higher Z foam. The fraction of backscattered light scales linearly with incident laser intensity for the range of intensities examined. Ta2O5 foams had significantly lower levels of backscatter (1–3%) than the SiO2 (4–8%), which is consistent with estimates of large Landau damping due to the presence of the oxygen atoms. The measured fraction of SBS backscattered laser energy for a 2 mg/cc SiO2 foam shot was ~4 times lower than predicted by simulations assuming a gas-like foam. We found that we needed to assume increased ion heating such that Ti/Te ~1.2–1.5 in the plasma to agree with the measured SBS reflectivity. Analytical models of laser-heated foams predict preferential heating of the ions as has been observed in previous experiments.},
doi = {10.1063/5.0025639},
journal = {Physics of Plasmas},
number = 1,
volume = 28,
place = {United States},
year = {Tue Jan 12 00:00:00 EST 2021},
month = {Tue Jan 12 00:00:00 EST 2021}
}
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