Air refractive index fluctuation ( $\mathrm{\Delta }{n}_{\text{air}}$ ) 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 $\mathrm{\Delta }{n}_{\text{air}}$ inside a normal air-environment chamber using a Fabry–Perot cavity and a piezoelectric volume actuator. The temporal air refractive index ( $n_{\text{air}}$ ) at a local point is maintained constant with an expanded uncertainty of $\sim 4.2\times {10}^{-9}$ ( $k=2$ ), a sufficiently low uncertainty for precise measurements unaffected by $\mathrm{\Delta }{n}_{\text{air}}$ to be made inside a chamber.

© 2010 Optical Society of America

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