Chinese Optics Letters, 2017, 15 (5): 053101, Published Online: Jul. 23, 2018
Simultaneous measurements of s - and p -polarization reflectivity with a cavity ring-down technique employing no polarization optics
310.0310 Thin films 310.6860 Thin films, optical properties 120.0120 Instrumentation, measurement, and metrology
Abstract
The cavity ring-down (CRD) technique is adopted for simultaneously measuring s - and p -polarization reflectivity of highly reflective coatings without employing any polarization optics. As the s - and p -polarized light trapped in the ring-down cavity decay independently, with a randomly polarized light source the ring-down signal recorded by a photodetector presents a double-exponential waveform consisting of ring-down signals of both s - and p -polarized light. The s - and p -polarization reflectivity values of a test mirror are therefore simultaneously determined by fitting the recorded ring-down signal with a double-exponential function. The determined s - and p -polarization reflectivity of 30° and 45° angle of incidence mirrors are in good agreement with the reflectivity values measured with the conventional CRD technique employing a polarizer for polarization control.
Hao Cui, Bincheng Li, Yanling Han, Jing Wang, Chunming Gao, Yafei Wang. Simultaneous measurements of