Interferometry with direct compensation of fluctuations of refractive index of air

Josef Lazar; Ondřej Číp; Martin Čížek; Jan Hrabina; Zdeněk Buchta

doi:10.1117/12.881889

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14 December 2010 Interferometry with direct compensation of fluctuations of refractive index of air

Josef Lazar, Ondřej Číp, Martin Čížek, Jan Hrabina, Zdeněk Buchta

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Proceedings Volume 7746, 17th Slovak-Czech-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics; 77460E (2010) https://doi.org/10.1117/12.881889
Event: 17th Slovak-Czech-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 2010, Liptovsky Jan, Slovakia

Abstract

We present an experimental arrangement of an interferometric system designed to operate with full compensation for varying refractive index of air in the measuring axis. The concept is based on a principle where the wavelength of the laser source is derived not from an optical frequency of the stabilized laser but from a fixed length being a base-plate or a frame of the whole measuring setup. This results into stabilization of the wavelength of the laser source in atmospheric conditions to mechanical length of suitable etalon made of a material with very low thermal expansion. The ultra-low thermal expanding glass ceramic materials available on the market perform thermal expansion coefficients on the level 10^-8 which significantly exceeds the limits of uncertainty posed by indirect evaluation of refractive index of air through Edlen formula. To verify the concept a tracking of laser frequency following the drift of refractive index has been performed.

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Josef Lazar, Ondřej Číp, Martin Čížek, Jan Hrabina, and Zdeněk Buchta "Interferometry with direct compensation of fluctuations of refractive index of air", Proc. SPIE 7746, 17th Slovak-Czech-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 77460E (14 December 2010); https://doi.org/10.1117/12.881889

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