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Interferometry with direct compensation of fluctuations of refractive index of air
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SYSNO ASEP 0352206 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Interferometry with direct compensation of fluctuations of refractive index of air Author(s) Lazar, Josef (UPT-D) RID, ORCID, SAI
Číp, Ondřej (UPT-D) RID, SAI, ORCID
Čížek, Martin (UPT-D) RID, ORCID, SAI
Hrabina, Jan (UPT-D) RID, ORCID, SAI
Buchta, Zdeněk (UPT-D) RID, SAI, ORCIDNumber of authors 5 Source Title 17th Slovak-Czech-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics (Proceedings of SPIE Vol. 7746). - Bellingham : SPIE, 2010 - ISBN 978-0-8194-8236-5 Pages 77460e: 1-6 Number of pages 6 s. Action Slovak-Czech-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics /17./ Event date 06.09.2010 VEvent location Liptovsky Jan Country SK - Slovakia Event type WRD Language eng - English Country US - United States Keywords refractometry ; nanopositioning ; interferometry ; nanometrology Subject RIV BH - Optics, Masers, Lasers R&D Projects LC06007 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) KAN311610701 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) FR-TI1/241 GA MPO - Ministry of Industry and Trade (MPO) GA102/09/1276 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z20650511 - UPT-D (2005-2011) Annotation 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. Workplace Institute of Scientific Instruments Contact Martina Šillerová, sillerova@ISIBrno.Cz, Tel.: 541 514 178 Year of Publishing 2011
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