Klaassen Thijs, de Jong Johan, van Exter Martin, Woerdman J P
Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands.
Opt Lett. 2005 Aug 1;30(15):1959-61. doi: 10.1364/ol.30.001959.
Small-angle scattering due to mirror surface roughness is shown to couple the optical modes and deform the transmission spectra in a frequency-degenerate optical cavity. A simple model based on a random scattering matrix clearly visualizes the mixing and avoided crossings between multiple transverse modes. These effects are visible only in the frequency-domain spectra; cavity ringdown experiments are unaffected by changes in the spatial coherence, as they probe just the intracavity photon lifetime.
结果表明，镜面粗糙度引起的小角度散射会耦合光学模式，并使频率简并光学腔中的透射光谱发生畸变。基于随机散射矩阵的简单模型清晰地呈现了多个横向模式之间的混合和避免交叉。这些效应仅在频域光谱中可见；腔衰荡实验不受空间相干性变化的影响，因为它们仅探测腔内光子寿命。
