Abstract

A spectral ripple effect observed in fold-type continuous-wave cavity ring down spectroscopy is described and studied. Its period was measured as 0.02cm1 in a 49.1 cm long V-shaped glass ceramics cavity. To find its origin, various losses of high-reflectivity coating and their relations to the optical field in the V-shaped cavity, especially the optical field inside the folding mirror coating, have been discussed and analyzed according to the interference theory and the matrix calculation method. It is found that the ripple mainly comes from an interference effect at the folding mirror coating between the direct and the inverse light waves. The interference effect results in the periodic fluctuations of the scattering and absorption loss of the high-reflectivity coating, so it can be used to measure some special losses of the high-reflectivity coating and separate them from the total loss of the coating.

© 2010 Optical Society of America

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