S.A. van den Berg, G.J.P. Kok, S.T. Persijn, M.G. Zeitouny and N. Bhattacharya, "Many-wavelength interferometry with thousands of lasers for absolute distance measurement", Phys. Rev. Lett. 108, 183901 (2012).
We demonstrate a new technique for absolute distance measurement with a femtosecond frequency comb laser, based on unraveling the output of an interferometer to distinct comb modes with 1 GHz spacing. From the fringe patterns that are captured with a camera, a distance is derived by combining spectral and homodyne interferometry, exploiting about 9000 continuous wave lasers. This results in a measurement accuracy far within an optical fringe (λ/30), combined with a large range of nonambiguity (15 cm). Our technique merges multiwavelength interferometry and spectral interferometry, within a single scheme.
The article can only be downloaded for free when your organization has a contract with the publisher.
The link to the publisher is here.