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

Optical properties of micrometer size water droplets studied by cavity ringdown spectroscopy

S. Rudić, R. E. H. Miles, A. J. Orr-Ewing, and J. P. Reid
Appl. Opt. 46(24) 6142-6150 (2007)

Characterization of single airborne particle extinction using the tunable optical trap-cavity ringdown spectroscopy (OT-CRDS) in the UV

Zhiyong Gong, Yong-Le Pan, and Chuji Wang
Opt. Express 25(6) 6732-6745 (2017)

Forward-scattering corrected extinction by nonspherical particles

Craig F. Bohren and Gary Koh
Appl. Opt. 24(7) 1023-1029 (1985)

Fixed-frequency cavity ringdown diagnostic for atmospheric particulate matter

A. D. Sappey, E. S. Hill, T. Settersten, and M. A. Linne
Opt. Lett. 23(12) 954-956 (1998)

Forward-scatter meter for estimating 10.6-μm aerosol extinction

H. Gerber
Appl. Opt. 26(3) 539-544 (1987)