Laser frequency upconversion in plasmas with finite ionization rates
Abstract
Laser frequency can be upconverted in a plasma undergoing ionization. For finite ionization rates, the laser pulse energy is partitioned into a pair of counterpropagating waves and static transverse currents. The wave amplitudes are determined by the ionization rates and the input pulse duration. The strongest output waves can be obtained when the plasma is fully ionized in a time that is shorter than the pulse duration. The static transverse current can induce a static magnetic field with instant ionization, but it dissipates as heat if the ionization time is longer than a few laser periods. As a result, this picture comports with experimental data, providing a description of both laser frequency upconverters and other laser-plasma interaction with evolving plasma densities.
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1580576
- Grant/Contract Number:
- AC02-09CH11466; NA0003871; FA9550-15-1-0391
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 26; Journal Issue: 8; 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
Citation Formats
Qu, Kenan, and Fisch, Nathaniel J. Laser frequency upconversion in plasmas with finite ionization rates. United States: N. p., 2019.
Web. doi:10.1063/1.5110292.
Qu, Kenan, & Fisch, Nathaniel J. Laser frequency upconversion in plasmas with finite ionization rates. United States. doi:10.1063/1.5110292.
Qu, Kenan, and Fisch, Nathaniel J. Thu .
"Laser frequency upconversion in plasmas with finite ionization rates". United States. doi:10.1063/1.5110292. https://www.osti.gov/servlets/purl/1580576.
@article{osti_1580576,
title = {Laser frequency upconversion in plasmas with finite ionization rates},
author = {Qu, Kenan and Fisch, Nathaniel J.},
abstractNote = {Laser frequency can be upconverted in a plasma undergoing ionization. For finite ionization rates, the laser pulse energy is partitioned into a pair of counterpropagating waves and static transverse currents. The wave amplitudes are determined by the ionization rates and the input pulse duration. The strongest output waves can be obtained when the plasma is fully ionized in a time that is shorter than the pulse duration. The static transverse current can induce a static magnetic field with instant ionization, but it dissipates as heat if the ionization time is longer than a few laser periods. As a result, this picture comports with experimental data, providing a description of both laser frequency upconverters and other laser-plasma interaction with evolving plasma densities.},
doi = {10.1063/1.5110292},
journal = {Physics of Plasmas},
number = 8,
volume = 26,
place = {United States},
year = {2019},
month = {8}
}
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