Smith Glenn S
School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0250, USA.
Appl Opt. 2011 Oct 1;50(28):5422-9. doi: 10.1364/AO.50.005422.
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.
建立了一个分析模型，用于描述腔衰荡光谱测量中粒子对光的消光作用。假设腔内的电磁场为最低阶高斯光束，并采用范德胡尔斯对球体散射的近似方法来考虑粒子的散射。该模型既包括正向的相干散射，也包括电大尺寸粒子在正向的强散射。该模型用于估计粒子散射并耦合回入射光束的能量。研究了这种耦合对球形粒子消光截面测量的影响。
