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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 19 — Jul. 1, 2007
  • pp: 3921–3927

Detection of atomic hydrogen in flames using picosecond two-color two-photon-resonant six-wave-mixing spectroscopy

Waruna D. Kulatilaka, Robert P. Lucht, Sukesh Roy, James R. Gord, and Thomas B. Settersten  »View Author Affiliations


Applied Optics, Vol. 46, Issue 19, pp. 3921-3927 (2007)
http://dx.doi.org/10.1364/AO.46.003921


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Abstract

We report an investigation of two-color six-wave-mixing spectroscopy techniques using picosecond lasers for the detection of atomic hydrogen in an atmospheric-pressure hydrogen–air flame. An ultraviolet laser at 243 nm was two-photon-resonant with the 2 S 1 / 2 1 S 1 / 2 transition, and a visible probe laser at 656 nm was resonant with H α transitions ( n = 3 n = 2 ) . The signal dependence on the polarization of the pump laser was investigated for a two- beam polarization-spectroscopy experimental configuration and for a four- beam grating configuration. A direct comparison of the absolute signal and background levels in the two experimental geometries demonstrated a significant advantage to using the four-beam grating geometry over the simpler two-beam configuration. Picosecond laser pulses provided sufficient time resolution to investigate hydrogen collisions in the atmospheric-pressure flame. Time-resolved two-color laser-induced fluorescence was used to measure an n = 2 population lifetime of 110 ps, and time-resolved two-color six-wave-mixing spectroscopy was used to measure a coherence lifetime of 76 ps. Based on the collisional time scale, we expect that the six-wave-mixing signal dependence on collisions is significantly reduced with picosecond laser pulses when compared to laser pulse durations on the nanosecond time scale.

© 2007 Optical Society of America

OCIS Codes
(020.1670) Atomic and molecular physics : Coherent optical effects
(020.2070) Atomic and molecular physics : Effects of collisions
(280.1740) Remote sensing and sensors : Combustion diagnostics
(300.6420) Spectroscopy : Spectroscopy, nonlinear
(300.6500) Spectroscopy : Spectroscopy, time-resolved

ToC Category:
Combustion

History
Original Manuscript: September 8, 2006
Manuscript Accepted: November 28, 2006
Published: June 12, 2007

Citation
Waruna D. Kulatilaka, Robert P. Lucht, Sukesh Roy, James R. Gord, and Thomas B. Settersten, "Detection of atomic hydrogen in flames using picosecond two-color two-photon-resonant six-wave-mixing spectroscopy," Appl. Opt. 46, 3921-3927 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-19-3921

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