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Microsecond-resolved SDR-based cavity ring down ellipsometry

D. Sofikitis, A. K. Spiliotis, K. Stamataki, G. E. Katsoprinakis, L. Bougas, P. C. Samartzis, B. Loppinet, T. P. Rakitzis, M. Surligas, and S. Papadakis

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Abstract

We present an experimental apparatus that allows microsecond-resolved ellipsometric and absorption measurements. The apparatus is based on an optical cavity containing a Dove prism, in which light undergoes total internal reflection (TIR), while the data acquisition is based on software defined radio technology and custom-built drivers. We demonstrate the ability to sense rapid variations in the refractive index above the TIR interface for arbitrarily long times with a temporal resolution of at least 2 μs.

© 2015 Optical Society of America

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