Abstract
An optical method for measuring the gas density by monitoring the refractive index inside a high-finesse Fabry–Perot cavity is presented. The frequency of a narrow linewidth Er:fiber laser, locked to a mode of the cavity, is measured with the help of an optical frequency comb while the gas density inside the cavity changes. A resolution of 1.4 × 10−6 mol m−3 is achieved in 3 s for nitrogen, which allows measurement of a relative gas density change of 3.4 × 10−8 at atmospheric pressure.
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