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Measurement of the effective optical path length of diffusing integrating cavities using time-resolved spectroscopy

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Abstract

A method to measure the effective optical path length (EOPL) of a diffusing cavity using time-resolved spectroscopy is presented. A 710 nm short-pulsed laser was employed as the light source with a FWHM of 0.7 ns. From the temporal response curves, the time to establish a uniform optical field was obtained as approximately 4 ns for this cavity. Correspondingly, light was scattered 5–6 times by the inner coating. EOPLs with different port fractions were obtained by the selection of an appropriate initial time. Moreover, we verified a previously reported theoretical EOPL law using time-resolved spectroscopic results. This work provides a method to measure the EOPL of a diffusing cavity at different wavelengths.

© 2018 Optical Society of America

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