Název: Evaluation of lenght of the Fabry-Perot cavity with ultra-low expansion spacer with optical frequency comb
Autoři: Šmíd, Radek ; Čížek, Martin ; Číp, Ondřej
Typ dokumentu: Příspěvky z konference
Konference/Akce: Optics and Measurement 2012, Liberec (CZ), 2012-10-16 / 2012-10-18
Rok: 2012
Jazyk: eng
Abstrakt: The ultra-low expansion materials play a crucial role in laser stabilization and they are essential for laser stalibization. Blocks made from ultra-low expansion material are used as a base for precise interferometric measurements and in AFM microscopes. In our experiment we have monitored the free spectral range (FSR) changes and absolute length of a Fabry-Perot cavity (FPC) with a spacer made from an ultra-low expansion ceramics (Zerodur) with the expansion coefficient (CTE) of 2.8 • 10-8K-1. Experiment was carried out in the vacuum chamber at the pressure as low as 1 O'5 Pa. A fiber based femtosecond mode-locked laser with 100 MHz repetition frequency and central wavelength of 1550 nm was locked to a GPS disciplined crystal oscillator with a short term stability better than 10"12 and long term stability controlled by GPS clocks. An auxiliary tunable DFB laser diode was locked to a certain optical mode of the FPC. A beat-note signal from optical mixing between the laser and a stabilized femtosecond frequency comb is detected and processed. The absolute optical frequency of this mode is defined by saturation to acetylene cell. The FPC spacer of Zerodur material of 175 mm length was analyzed during the temperature cycling process from 22 - 35°C. Measured CTE of the spacer material was (0.069 ± 0.005) • 10-6K-1. Material exhibited hysteresis in the spacer length up to 8 nm during cycling process.
Klíčová slova: coeffiecient of thermal expansion; Fabry-Perot cavity; optical frequency comb; ultra-low expansion
Číslo projektu: GPP102/12/P962 (CEP), ED0017/01/01, GAP102/10/1813 (CEP), GPP102/11/P819 (CEP)
Poskytovatel projektu: GA ČR, GA MŠk, GA ČR, GA ČR
Zdrojový dokument: Optics and Measurement 2012. Proceedings of the International Conference, ISBN 978-80-87026-02-1

Instituce: Ústav přístrojové techniky AV ČR (web)
Informace o dostupnosti dokumentu: Dokument je dostupný v příslušném ústavu Akademie věd ČR.
Původní záznam: http://hdl.handle.net/11104/0215506

Trvalý odkaz NUŠL: http://www.nusl.cz/ntk/nusl-135547


Záznam je zařazen do těchto sbírek:
Věda a výzkum > AV ČR > Ústav přístrojové techniky
Konferenční materiály > Příspěvky z konference