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Title: 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.

Authors:
ORCiD logo [1]; ORCiD logo [1]
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  1. Princeton Univ., Princeton, NJ (United States)
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.
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Qu, Kenan, & Fisch, Nathaniel J. Laser frequency upconversion in plasmas with finite ionization rates. United States. https://doi.org/10.1063/1.5110292
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Qu, Kenan, and Fisch, Nathaniel J. Thu . "Laser frequency upconversion in plasmas with finite ionization rates". United States. https://doi.org/10.1063/1.5110292. https://www.osti.gov/servlets/purl/1580576.
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@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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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1063/1.5110292
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Figures / Tables:

FIG. 1 FIG. 1: Time evolution of the transmitted pulse (top panel) and reflected pulse (bottom panel) when the pulse frequency is upconverted from ω0 to 10ω0 in an ionizing plasma. The laser frequency increases as ω(t) = ω0 + $\dot{ω}t$ where $\dot{ω}$ = 0.1$ω^2_0$ . The initial pulse envelope is e−[z/(ω0cτ)]more » 2 with ω0τ = 5.« less
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