Suppression of Air Refractive Index Variations in High-Resolution Interferometry

0368382 - ÚPT 2012 RIV CH eng J - Journal Article
Lazar, Josef - Číp, Ondřej - Čížek, Martin - Hrabina, Jan - Buchta, Zdeněk
Suppression of Air Refractive Index Variations in High-Resolution Interferometry.
Sensors. Roč. 11, č. 8 (2011), s. 7644-7655. E-ISSN 1424-8220
R&D Projects: GA ČR GA102/09/1276; GA ČR GPP102/11/P820; GA AV ČR KAN311610701; GA MŠMT(CZ) LC06007
Institutional research plan: CEZ:AV0Z20650511
Keywords : refractometry * nanopositioning * interferometry * nanometrology
Subject RIV: BH - Optics, Masers, Lasers
Impact factor: 1.739, year: 2011

The influence of the refractive index of air has proven to be a major problem on the road to improvement of the uncertainty in interferometric displacement measurements. We propose an approach with two counter-measuring interferometers acting as a combination of tracking refractometer and a displacement interferometer referencing the wavelength of the laser source to a mechanical standard made of a material with ultra-low thermal expansion. This technique combines length measurement within a specified range with measurement of the refractive index fluctuations in one axis. Errors caused by different position of the interferometer laser beam and air sensors are thus eliminated. The method has been experimentally tested in comparison with the indirect measurement of the refractive index of air in a thermal controlled environment. Over a 1 K temperature range an agreement on the level of 5 x 10(-8) has been achieved.
Permanent Link: http://hdl.handle.net/11104/0202743