26 July 2011 Interferometry with referencing of wavelength
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Proceedings Volume 8001, International Conference on Applications of Optics and Photonics; 80010X (2011) https://doi.org/10.1117/12.892700
Event: International Conference on Applications of Optics and Photonics, 2011, Braga, Portugal
Abstract
In this contribution we present an approach to incremental interferometric measurements of displacements over a limited range where the atmospheric wavelength of the coherent laser source is either directly stabilized to a mechanical reference or is corrected to fit to the reference. The idea comes from the possibility to use a highly stable material for a reference frame, material which can perform thermal expansion coefficients on the level 10-8/K within a large temperature range up to 50K. Over a range of several K which may be the practical range for displacement measurements the coefficient is even smaller. This may outperform the best techniques of correction for the variations of the refractive index of air. The mechanics is always a part of the measurement setup and represents one of the sources of uncertainty. A link of the refractive to the mechanical reference can practically eliminate another source of uncertainty.
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Josef Lazar, Josef Lazar, Ondrej Cip, Ondrej Cip, Martin Cizek, Martin Cizek, Jan Hrabina, Jan Hrabina, Zdenek Buchta, Zdenek Buchta, "Interferometry with referencing of wavelength", Proc. SPIE 8001, International Conference on Applications of Optics and Photonics, 80010X (26 July 2011); doi: 10.1117/12.892700; https://doi.org/10.1117/12.892700
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