Phase and group refractive indices of air calculation by fitting\nof phase difference measured using a combination of laser and\nlow-coherence interferometry

0482686 - ÚPT 2018 RIV US eng C - Konferenční příspěvek (zahraniční konf.)
Pikálek, Tomáš - Šarbort, Martin - Číp, Ondřej - Pham, Minh Tuan - Lešundák, Adam - Pravdová, Lenka - Buchta, Zdeněk
Phase and group refractive indices of air calculation by fitting
of phase difference measured using a combination of laser and
low-coherence interferometry.
Optical Measurement Systems for Industrial Inspection X. (Proceedings of SPIE 10329). Bellingham: SPIE, 2017, č. článku 103293I. ISBN 9781510611030. ISSN 0277-786X.
[Conference on Optical Measurement Systems for Industrial Inspection /10./. Munich (DE), 26.06.2017-29.06.2017]
Grant CEP: GA MŠMT(CZ) LO1212; GA MŠMT ED0017/01/01
Institucionální podpora: RVO:68081731
Klíčová slova: air refractive index * laser interferometry * low-coherence interferometry
Obor OECD: Optics (including laser optics and quantum optics)

The air refractive index is an important parameter in interferometric length measurements, since it substantially
affects the measurement accuracy. We present a refractive index of air measurement method based on monitoring
the phase difference between the ambient air and vacuum inside a permanently evacuated double-spaced cell. The cell is placed in one arm of the Michelson interferometer equipped with two light sources—red LED and HeNe laser, while the low-coherence and laser interference signals are measured separately. Both phase and group refractive indices of air can be calculated from the measured signals. The method was experimentally verified by
comparing the obtained refractive index values with two different techniques.
Trvalý link: http://hdl.handle.net/11104/0278098