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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 6, Iss. 11 — Nov. 1, 1989
  • pp: 1979–1985

Two-photon-excited stimulated emission from atomic hydrogen in flames

J. E. M. Goldsmith  »View Author Affiliations


JOSA B, Vol. 6, Issue 11, pp. 1979-1985 (1989)
http://dx.doi.org/10.1364/JOSAB.6.001979


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Abstract

The first observation to the author’s knowledge of optically excited stimulated emission in atomic hydrogen is described. The two-photon n = 1 → n = 3 transition of hydrogen atoms in low-pressure flames is excited with 205-nm radiation produced by using a beta barium borate crystal to frequency mix the fundamental and frequency-doubled radiation from a 615-nm pulsed dye laser. The resulting 656-nm n = 3 → n = 2 Balmer-α radiation is readily observable by eye as a coherent beam propagating in both the forward and reverse directions. We describe a variety of characteristics of the stimulated emission, comparing its behavior with simultaneous measurements of two-photon-excited fluorescence, and discuss the possibility that the stimulated-emission process may affect the quantum yield of fluorescence and ionization detection methods. Potential diagnostic applications of two-photon-excited stimulated-emission detection for measuring atomic hydrogen in flames are demonstrated, using simultaneous profile measurements of stimulated emission and fluorescence signals.

© 1989 Optical Society of America

History
Original Manuscript: April 10, 1989
Manuscript Accepted: July 14, 1989
Published: November 1, 1989

Citation
J. E. M. Goldsmith, "Two-photon-excited stimulated emission from atomic hydrogen in flames," J. Opt. Soc. Am. B 6, 1979-1985 (1989)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-6-11-1979

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