Evaluation of thermal expansion coefficient of Fabry-Perot cavity using an optical frequency comb

0367517 - ÚPT 2012 RIV US eng C - Conference Paper (international conference)
Oulehla, Jindřich - Šmíd, Radek - Buchta, Zdeněk - Čížek, Martin - Mikel, Břetislav - Jedlička, Petr - Lazar, Josef - Číp, Ondřej
Evaluation of thermal expansion coefficient of Fabry-Perot cavity using an optical frequency comb.
Optical Measurement Systems for Industrial Inspection VII (Proceedings of SPIE Vol. 8082). Bellingham: SPIE, 2011, 80823Q:1-9. ISBN 978-0-8194-8678-3.
[Optical Measurement Systems for Industrial Inspection VII. Munich (DE), 23.05.2011-26.05.2011]
R&D Projects: GA MŠMT(CZ) LC06007; GA MŠMT 2C06012; GA MPO 2A-1TP1/127; GA MPO FT-TA3/133; GA MPO 2A-3TP1/113; GA ČR GA102/09/1276; GA ČR GA102/07/1179; GA ČR GAP102/10/1813; GA ČR GPP102/11/P819; GA ČR GP102/09/P293; GA ČR GP102/09/P630
Institutional research plan: CEZ:AV0Z20650511
Keywords : length standard * femtosecond laser * stabilization * Fabry-Perot cavity
Subject RIV: BH - Optics, Masers, Lasers

In construction of highly mechanically stable measuring devices like AFM microscopes or nano-comparators the use of low expansion materials is very necessary. We can find Zerodur ceramics or ULE glasses used as a frame or basement of these devices. The expansion coefficient of such low-expansion materials is lower than 0.01 x 10(-6) m . K(-1). For example in case of a frame or basement 20 cm long it leads to a dilatation approximately 4 nm per 1 K. For calculation of the total uncertainty of the mentioned measuring devices the knowledge of the thermal expansion coefficient of the frame or basement is necessary. In this work we present a method, where small distance changes are transformed into rf-frequency signal. The frequency of this signal is detected by a counter which measures the value of the frequency with respect to an ultra-stable time-base.
Permanent Link: http://hdl.handle.net/11104/0202170