Modeling the plasma kinetics in a kinetically enhanced copper vapor laser utilizing HCl+H 2 admixtures

Robert J. Carman, Richard P. Mildren, Michael J. Withford, Daniel J W Brown, James A. Piper

Research output: Contribution to journalArticleResearchpeer-review

Abstract

A detailed computer model has been used to simulate the plasma kinetics and lasing characteristics in a kinetically enhanced copper vapor laser (KE-CVL) which utilizes Ne-H 2-HCl buffer gas mixtures. The model reproduces key features of the observed operating characteristics of the KE-CVL - in particular, relating to the electrical characteristics of the plasma tube, time evolution of Cu 4s 2S 1/2 ground state density (c.f. hook measurements), and formation of the laser output. It is shown that the principal role of the HCl additive is to increase the electron loss rate during the interpulse period via dissociative attachment reactions between free electrons and vibrationally excited HCl(v = 1, 2) molecules. This leads to a reduction of the prepulse electron density, establishing more favorable prepulse conditions for laser action during the subsequent excitation phase. In the KE-CVL, the plasma skin effect governing the development of the radial electric field is greatly reduced compared to conventional CVL's, altering the spatio-temporal evolution of the optical gain and laser field intensities to substantially enhance high-beam-quality output. Comparisons between model results and experimental data for the decay rate of the Cu4s 2 2D 3/2 metastable lower laser level in the early afterglow suggest that there may be an additional de-excitation mechanism for the 2D 3/2,5/2 levels in the KE-CVL plasma which has yet to be identified.

LanguageEnglish
Pages438-449
Number of pages12
JournalIEEE Journal of Quantum Electronics
Volume36
Issue number4
DOIs
Publication statusPublished - Apr 2000

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admixtures
Vapors
vapors
Copper
Plasmas
copper
Kinetics
Lasers
kinetics
lasers
hooks
laser outputs
afterglows
laser plasmas
Optical gain
Skin effect
free electrons
decay rates
excitation
attachment

Cite this

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title = "Modeling the plasma kinetics in a kinetically enhanced copper vapor laser utilizing HCl+H 2 admixtures",
abstract = "A detailed computer model has been used to simulate the plasma kinetics and lasing characteristics in a kinetically enhanced copper vapor laser (KE-CVL) which utilizes Ne-H 2-HCl buffer gas mixtures. The model reproduces key features of the observed operating characteristics of the KE-CVL - in particular, relating to the electrical characteristics of the plasma tube, time evolution of Cu 4s 2S 1/2 ground state density (c.f. hook measurements), and formation of the laser output. It is shown that the principal role of the HCl additive is to increase the electron loss rate during the interpulse period via dissociative attachment reactions between free electrons and vibrationally excited HCl(v = 1, 2) molecules. This leads to a reduction of the prepulse electron density, establishing more favorable prepulse conditions for laser action during the subsequent excitation phase. In the KE-CVL, the plasma skin effect governing the development of the radial electric field is greatly reduced compared to conventional CVL's, altering the spatio-temporal evolution of the optical gain and laser field intensities to substantially enhance high-beam-quality output. Comparisons between model results and experimental data for the decay rate of the Cu4s 2 2D 3/2 metastable lower laser level in the early afterglow suggest that there may be an additional de-excitation mechanism for the 2D 3/2,5/2 levels in the KE-CVL plasma which has yet to be identified.",
author = "Carman, {Robert J.} and Mildren, {Richard P.} and Withford, {Michael J.} and Brown, {Daniel J W} and Piper, {James A.}",
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Modeling the plasma kinetics in a kinetically enhanced copper vapor laser utilizing HCl+H 2 admixtures. / Carman, Robert J.; Mildren, Richard P.; Withford, Michael J.; Brown, Daniel J W; Piper, James A.

In: IEEE Journal of Quantum Electronics, Vol. 36, No. 4, 04.2000, p. 438-449.

Research output: Contribution to journalArticleResearchpeer-review

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