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We are exploring air wavelength references useful for interferometry. Femtosecond comb frequency measurements determine mode wavelengths of a stable optical cavity in vacuum, and subsequently a tunable laser is locked to the modes in air.
Fox, R.
and Hollberg, L.
(2005),
Wavelength References for Optical Interferometry, Proc. 2005 Conf. Lasers and Electro-Optics, Baltimore, MD, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=30063
(Accessed October 14, 2025)