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Optics Letters

Optics Letters


  • Vol. 24, Iss. 10 — May. 15, 1999
  • pp: 667–669

High-sensitivity detection of CH radicals in flames by use of a diode-laser-based near-ultraviolet light source

Kristen A. Peterson and Daniel B. Oh  »View Author Affiliations

Optics Letters, Vol. 24, Issue 10, pp. 667-669 (1999)

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CH radical distributions in ethylene–air and methane–air diffusion flames are mapped by wavelength-modulation absorption spectroscopy (WMS). Tunable, wavelength-modulated 426-nm light is generated by frequency doubling of a modulated 852-nm distributed Bragg reflector diode laser. Absorbances of 5×10-5 are measured with second-harmonic (2f) WMS with a signal-to-noise ratio of 3:1 in a 3-Hz measurement bandwidth. The feasibility of simultaneous line-of-sight absorption and spatially resolved laser-induced-fluorescence detection with a single excitation beam is also demonstrated. This near-UV source is suitable for microgravity drop-tower experiments and other applications in which compact, rugged, energy-efficient instrumentation is required.

© 1999 Optical Society of America

OCIS Codes
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics
(120.1880) Instrumentation, measurement, and metrology : Detection
(140.2020) Lasers and laser optics : Diode lasers
(190.2620) Nonlinear optics : Harmonic generation and mixing
(300.6380) Spectroscopy : Spectroscopy, modulation

Kristen A. Peterson and Daniel B. Oh, "High-sensitivity detection of CH radicals in flames by use of a diode-laser-based near-ultraviolet light source," Opt. Lett. 24, 667-669 (1999)

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