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Updated: Aug 14, 2026

Implementation of a Reference Interferometer for Nanodetection
Published on: April 26, 2014
Wavelength references for interferometry in air
Richard W Fox1, Brian R Washburn, Nathan R Newbury
1National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA. richard.fox@nist.gov
Abstract:
Cavity-mode wavelengths in air are determined by measuring a laser's frequency while it is locked to the mode in vacuum during a calibration step and subsequently correcting the mode wavelength for atmospheric pressure compression, temperature difference, and material aging. Using a Zerodur ring cavity, we demonstrate a repeatability of +/- 2 x 10(-8) (3sigma), with the wavelength accuracy limited to +/- 4 x 10(-8) by knowledge of the absolute helium gas temperature during the pressure calibration. Mirror cleaning perturbed the mode frequency by less than deltav/v approximately 3 x 10(-9), limited by temperature correction residuals.
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