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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 28 — Oct. 1, 2011
  • pp: 5422–5429

Estimate for the effect of forward scattering on the measurement of extinction for particles by cavity ringdown spectroscopy

Glenn S. Smith  »View Author Affiliations


Applied Optics, Vol. 50, Issue 28, pp. 5422-5429 (2011)
http://dx.doi.org/10.1364/AO.50.005422


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Abstract

An analytical model is formulated for the extinction of light by particles in a cavity ringdown spectroscopy measurement. The electromagnetic field inside the cavity is assumed to be the lowest-order Gaussian beam, and the scattering by the particles is incorporated using van de Hulst’s approximation for the scattering by a sphere. This model includes both coherent scattering in the forward direction and strong scattering in the forward direction for electrically large particles. The model is used to estimate the amount of energy scattered by the particles that is coupled back into the incident beam. The consequences of this coupling for the measurement of the extinction cross section of spherical particles are examined.

© 2011 Optical Society of America

OCIS Codes
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(230.5750) Optical devices : Resonators
(290.5820) Scattering : Scattering measurements
(290.5850) Scattering : Scattering, particles
(300.0300) Spectroscopy : Spectroscopy
(300.6190) Spectroscopy : Spectrometers

ToC Category:
Scattering

History
Original Manuscript: April 19, 2011
Manuscript Accepted: August 12, 2011
Published: September 23, 2011

Citation
Glenn S. Smith, "Estimate for the effect of forward scattering on the measurement of extinction for particles by cavity ringdown spectroscopy," Appl. Opt. 50, 5422-5429 (2011)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-50-28-5422

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