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Proceedings Paper

Chemical pumping of potential visible laser transistions in bismuth monofluoride by thermal dissociation of fluorine azide
Author(s): Bruce K. Winker; David J. Benard; Tom A. Seder
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Paper Abstract

A visible chemical laser on the BiF(A-X) transistions at 430-470 nm can potentially be generated by the interaction of Bi-atoms with metastable species such as NF(a1Δ). Experiments were performed in which these constituents were obtained in situ by fast pulsed CO2 laser pyrolysis of FN3 and Bi(CH3)3, respectively. Time-resolved optical diagnostics were used to follow the concentrations of FN3, NF(a1Δ), Bi(CH3)x, Bi(2D) and BiF(A). The optimal concentrations of FN3 and Bi(CH3)3 were limited by NF(a1Δ) self-annihilation and Bi(2D) quenching reactions, respectively. The Bi(CH3)3 was found to be only 20 % dissociated at the peak of the NF(a1Δ) time profile and the yield of Bi-atoms from dissociated Bi(CH3)3 was determined to be approximately 5%; however, significant recycling of the active Bi/BiF species was observed at a limiting rate of 4 - 5 x 10-11 cm3/s, driven by NA(a1Δ). On the basis of these results, a peak BiF(A) concentration of 1013/cm3 was predicted by kinetic modeling and subsequently observed. The model also predicts an absolute population inversion of the BiF(A-X) transistion at high NF(a1Δ) concentration with unsaturated gains of approximately 10-3/cm. Intracavity experiments have verified that the BiF(X) ground state concentration is low enough relative to the excited state to generate at least a partial inversion, and initial evidence for an absolute population inversion has been obtained.

Paper Details

Date Published: 1 June 1990
PDF: 17 pages
Proc. SPIE 1225, High-Power Gas Lasers, (1 June 1990); doi: 10.1117/12.18524
Show Author Affiliations
Bruce K. Winker, Rockwell International Science Ctr. (United States)
David J. Benard, Rockwell International Science Ctr. (United States)
Tom A. Seder, Rockwell International Science Ctr. (United States)

Published in SPIE Proceedings Vol. 1225:
High-Power Gas Lasers
Petras V. Avizonis; Charles Freed; Jin J. Kim; Frank K. Tittel, Editor(s)

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