Abstract

We report a higher precision measurement of the refractive index of carbon dioxide using a frequency comb as the light source in a Mach–Zehnder interferometer setup. The experimental sensitivity can reach the level of 8.8×109. Taking into account the measurement accuracy of temperature and pressure, the experimental accuracy has a value of 1.2×108. The measurement result has a deviation from the commonly quoted result [Old et al., J. Opt. Soc. Am. 61, 89 (1971) ] by 6.4×107 at 800nm.

© 2007 Optical Society of America

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