title: Suppression of air refractive index variations in high-resolution interferometry.
abstract: 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 × 10(-8) has been achieved.
authors.affiliation: Institute of Scientific Instruments, Academy of Sciences of the Czech Republic, Královopolská 147, Brno 612 64, Czech Republic. joe@isibrno.cz
authors.forename: Josef
authors.initials: J
authors.lastname: Lazar
authors.forename: Ondřej
authors.initials: O
authors.lastname: Číp
authors.forename: Martin
authors.initials: M
authors.lastname: Čížek
authors.forename: Jan
authors.initials: J
authors.lastname: Hrabina
authors.forename: Zdeněk
authors.initials: Z
authors.lastname: Buchta
mesh_terms: D000388:Air; D000465:Algorithms; D002138:Calibration; D007368:Interferometry / Q000379:methods*; D008853:Microscopy / Q000295:instrumentation / Q000379:methods; D049329:Nanostructures; D036103:Nanotechnology / Q000379:methods*; D055100:Optical Fibers; D010825:Physics / Q000379:methods*; D012031:Refractometry; D015203:Reproducibility of Results; D013696:Temperature