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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 33 — Nov. 20, 1999
  • pp: 6951–6961

Experimental investigation of saturated degenerate four-wave mixing for quantitative concentration measurements

Thomas A. Reichardt, William C. Giancola, Christopher M. Shappert, and Robert P. Lucht  »View Author Affiliations


Applied Optics, Vol. 38, Issue 33, pp. 6951-6961 (1999)
http://dx.doi.org/10.1364/AO.38.006951


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Abstract

Degenerate four-wave mixing (DFWM) line shapes and signal intensities are measured experimentally in well-characterized hydrogen–air flames operated over a wide range of equivalence ratios. We use both low (perturbative) and high (saturating) beam intensities in the phase-conjugate geometry. Resonances in the A2Σ+X2Π (0,0) band of OH are probed with multiaxial-mode laser radiation. The effects of saturation on the line-center signal intensity and the resonance linewidth are investigated. The DFWM signal intensities are used to measure OH number densities in a series of near-adiabatic flames at equivalence ratios ranging from 0.5 to 1.5. Use of saturating pump intensities minimizes the effects of beam absorption, providing more-accurate number density measurements. The saturated DFWM results are in excellent agreement with OH absorption measurements and equilibrium calculations of OH number density. The polarization dependence of the P1(2) and R2(1) resonances is investigated in both laser intensity regimes. There is a significant change in relative reflectivities for different polarization configurations when saturated.

© 1999 Optical Society of America

OCIS Codes
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics
(300.2570) Spectroscopy : Four-wave mixing
(300.6420) Spectroscopy : Spectroscopy, nonlinear

History
Original Manuscript: April 9, 1999
Revised Manuscript: August 11, 1999
Published: November 20, 1999

Citation
Thomas A. Reichardt, William C. Giancola, Christopher M. Shappert, and Robert P. Lucht, "Experimental investigation of saturated degenerate four-wave mixing for quantitative concentration measurements," Appl. Opt. 38, 6951-6961 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-33-6951

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