Time resolved H atom density measurements in a Cu HyBrID laser

Research output: Contribution to journalArticleResearch

Abstract

We are presently developing nonlinear spectroscopic techniques for measuring the spatio-temporal density behaviour of H and halogen atoms species to investigate the action of these species in halogen enhanced copper lasers. In this paper, we report time resolved measurements of ground-state H atom density in a Cu HyBrID laser obtained using two-photon allowed laser induced fluorescence. Ultraviolet probe radiation (205nm) was focussed through an end window to excite the n=3 level and the resultant Balmer fluorescence detected via a side window. The results indicate that the H atom density is depleted to less than half its prepulse value during the excitation pulse and then recovers almost fully during the first 20 microseconds of the interpulse period. By interrupting the discharge, we also have used the technique to investigate the H reassociation rate at the tube wall. The results suggest the technique, which may also be adapted to obtain halogen densities and gas temperature measurements, is a promising diagnostic for investigating halogen enhanced Cu laser vapor plasmas.

LanguageEnglish
Pages191-194
Number of pages4
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume4184
DOIs
Publication statusPublished - 2001

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Halogens
halogens
Laser
Atoms
Lasers
lasers
atoms
Fluorescence
Laser-induced Fluorescence
Gas fuel measurement
Temperature Measurement
gas temperature
Time measurement
Copper
Ultraviolet
Temperature measurement
laser induced fluorescence
Ground state
Ground State
temperature measurement

Cite this

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title = "Time resolved H atom density measurements in a Cu HyBrID laser",
abstract = "We are presently developing nonlinear spectroscopic techniques for measuring the spatio-temporal density behaviour of H and halogen atoms species to investigate the action of these species in halogen enhanced copper lasers. In this paper, we report time resolved measurements of ground-state H atom density in a Cu HyBrID laser obtained using two-photon allowed laser induced fluorescence. Ultraviolet probe radiation (205nm) was focussed through an end window to excite the n=3 level and the resultant Balmer fluorescence detected via a side window. The results indicate that the H atom density is depleted to less than half its prepulse value during the excitation pulse and then recovers almost fully during the first 20 microseconds of the interpulse period. By interrupting the discharge, we also have used the technique to investigate the H reassociation rate at the tube wall. The results suggest the technique, which may also be adapted to obtain halogen densities and gas temperature measurements, is a promising diagnostic for investigating halogen enhanced Cu laser vapor plasmas.",
author = "Mildren, {R. P.} and Carman, {R. J.} and Piper, {J. A.}",
year = "2001",
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Time resolved H atom density measurements in a Cu HyBrID laser. / Mildren, R. P.; Carman, R. J.; Piper, J. A.

In: Proceedings of SPIE - The International Society for Optical Engineering, Vol. 4184, 2001, p. 191-194.

Research output: Contribution to journalArticleResearch

TY - JOUR

T1 - Time resolved H atom density measurements in a Cu HyBrID laser

AU - Mildren, R. P.

AU - Carman, R. J.

AU - Piper, J. A.

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N2 - We are presently developing nonlinear spectroscopic techniques for measuring the spatio-temporal density behaviour of H and halogen atoms species to investigate the action of these species in halogen enhanced copper lasers. In this paper, we report time resolved measurements of ground-state H atom density in a Cu HyBrID laser obtained using two-photon allowed laser induced fluorescence. Ultraviolet probe radiation (205nm) was focussed through an end window to excite the n=3 level and the resultant Balmer fluorescence detected via a side window. The results indicate that the H atom density is depleted to less than half its prepulse value during the excitation pulse and then recovers almost fully during the first 20 microseconds of the interpulse period. By interrupting the discharge, we also have used the technique to investigate the H reassociation rate at the tube wall. The results suggest the technique, which may also be adapted to obtain halogen densities and gas temperature measurements, is a promising diagnostic for investigating halogen enhanced Cu laser vapor plasmas.

AB - We are presently developing nonlinear spectroscopic techniques for measuring the spatio-temporal density behaviour of H and halogen atoms species to investigate the action of these species in halogen enhanced copper lasers. In this paper, we report time resolved measurements of ground-state H atom density in a Cu HyBrID laser obtained using two-photon allowed laser induced fluorescence. Ultraviolet probe radiation (205nm) was focussed through an end window to excite the n=3 level and the resultant Balmer fluorescence detected via a side window. The results indicate that the H atom density is depleted to less than half its prepulse value during the excitation pulse and then recovers almost fully during the first 20 microseconds of the interpulse period. By interrupting the discharge, we also have used the technique to investigate the H reassociation rate at the tube wall. The results suggest the technique, which may also be adapted to obtain halogen densities and gas temperature measurements, is a promising diagnostic for investigating halogen enhanced Cu laser vapor plasmas.

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