Spatial Coating Inhomogeneity of Highly Reflective Mirrors Determined by Cavity Ringdown Measurements

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Date
2016-03-02
Authors
Tan, Zhongqi
Yang, Kaiyong
Long, Xingwu
Zhang, Yibo
Loock, Hans-Peter
Keyword
Spatial Coating , Highly Reflective Mirrors , Cavity Ringdown Measurements , Optical Loss , Cavity Modes , Ringdown Times
Abstract
The inhomogeneity of high-reflectivity mirror coatings is a potential error source in the application of the cavity ringdown technique. Here, the ringdown times for different transverse modes were recorded. Together with the observed spatial distribution of these modes the ringdown times can be used to approximately locate the position of coating defects. A simple model based on a weighted sum of Hermite–Gaussian mode functions is used to explain the experimental results.
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