Abstract
We report an experimental method for high-precision refractive index measurement using a Michelson interferometer setup with a femtosecond optical frequency comb as the light source. We demonstrate this technique by measuring the refractive index of air, under different pressures, inside a multipass cell. Both spectral and temporal interferograms are recorded. The method has a sensitivity of and a standard error of at fixed parameters (pressure and temperature). The possible variation of the density factor from the Lorentz–Lorenz equation is also discussed.
© 2005 Optical Society of America
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