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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Vol. 20, Iss. 1 — Jan. 1, 1995
  • pp: 100–102

Diode-laser-based sum-frequency generation of tunable wavelength-modulated UV light for OH radical detection

Daniel B. Oh  »View Author Affiliations


Optics Letters, Vol. 20, Issue 1, pp. 100-102 (1995)
http://dx.doi.org/10.1364/OL.20.000100


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Abstract

Greater than 1.5 μW of tunable wavelength-modulated 308-nm radiation was generated by sum-frequency mixing of 90 mW of 835-nm diode-laser output and 1.5 W of 488-nm Ar+-laser output in a beta-barium metaborate crystal. Hydroxyl radicals formed in a discharge-flow reactor were detected by use of the generated UV beam by direct absorption, wavelength-modulation absorption spectroscopy, and laser-induced fluorescence. Wavelength modulation with second-harmonic detection yielded an estimated minimum detectable absorbance of 8.5 × 10−6 at a 1-Hz bandwidth. This absorbance level corresponds to an OH detection sensitivity of 11.7 parts per trillion for a 1-m path length at 1 atm and 298 K.

© 1995 Optical Society of America

History
Original Manuscript: September 15, 1994
Published: January 1, 1995

Citation
Daniel B. Oh, "Diode-laser-based sum-frequency generation of tunable wavelength-modulated UV light for OH radical detection," Opt. Lett. 20, 100-102 (1995)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-20-1-100

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