Narrow-selection bandwith of femtosecond laser comb with application to changes in optical path distance

0352220 - ÚPT 2011 RIV US eng C - Conference Paper (international conference)
Šmíd, Radek - Ježek, Jan - Buchta, Zdeněk - Čížek, Martin - Lazar, Josef - Číp, Ondřej
Narrow-selection bandwith of femtosecond laser comb with application to changes in optical path distance.
Optical Micro- and Nanometrology III (Proceedings of SPIE Vol. 7718). Bellingham: SPIE, 2010, 771818: 1-8. ISBN 978-0-8194-8191-7.
[Optical Micro- and Nanometrology /3./. Brussels (BE), 13.04.2010]
Institutional research plan: CEZ:AV0Z20650511
Keywords : interferometry * cavity * optical frequency synthesis
Subject RIV: BH - Optics, Masers, Lasers

In this contribution we propose a scheme of Fabry-Perot interferometer measuring the absolute distance in atmosferic conditions using a femtosecond laser comb. The spacing of mirrors of the Fabry-Perot interferometer represents the length standard referenced to stable optical frequency of the femtosecond mode-locked laser. With the help of highly selective optical filter it is possible to get only a few of separate spectral components. By tuning and locking of the Fabry-Perot cavity to a selected single component it is possible to get a mechanical length standard with the uncertainty of the repetition frequency of the femtosecond laser. If the interferometer measures distance in atmospheric conditions, the absolute value of the laser wavelength fluctuates with a refractive index of air. Compairing the measurement in evacuated chamber with measurement in ambient air leads to enhanced precision in measurement of refrective index of air.
Permanent Link: http://hdl.handle.net/11104/0191783