Abstract

Air refractive index fluctuation (Δnair) is one of the largest uncertainty sources in precision interferometry systems that require a resolution of nanometer order or less. We introduce a method for the active suppression of Δnair inside a normal air-environment chamber using a Fabry–Perot cavity and a piezoelectric volume actuator. The temporal air refractive index (nair) at a local point is maintained constant with an expanded uncertainty of 4.2×109 (k=2), a sufficiently low uncertainty for precise measurements unaffected by Δnair to be made inside a chamber.

© 2010 Optical Society of America

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