Abstract

A method for measuring diffuse reflectivity using cubic cavity based on the variable port fraction method was developed by measuring oxygen $P_{11}$ line at 762 nm using tunable diode laser absorption spectroscopy. An experimental method to determine the additional path length $l_0$ was presented. We measured the diffuse reflectivity of a cubic cavity with scattering coatings of different thickness. The error of diffuse reflectivity was reduced from 0.004 to 0.0003 when the diffuse reflectivity increased from 0.867(4) to 0.9887(3). A simulation result manifests that the error of diffuse reflectivity has the potential to be further reduced at higher diffuse reflectivity.

© 2014 Optical Society of America

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