Počet záznamů: 1  

Evaluation of lenght of the Fabry-Perot cavity with ultra-low expansion spacer with optical frequency comb

  1. 1.
    0386130 - ÚPT 2013 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
    Šmíd, Radek - Čížek, Martin - Číp, Ondřej
    Evaluation of lenght of the Fabry-Perot cavity with ultra-low expansion spacer with optical frequency comb.
    Optics and Measurement 2012. Proceedings of the International Conference. Praha: Institute of Plasma Physics, 2012 - (Vít, T.; Kovačičinová, J.; Lédl, V.), s. 132-136. ISBN 978-80-87026-02-1.
    [Optics and Measurement 2012. Liberec (CZ), 16.10.2012-18.10.2012]
    Grant CEP: GA ČR(CZ) GPP102/12/P962; GA MŠMT ED0017/01/01; GA ČR GAP102/10/1813; GA ČR GPP102/11/P819
    Institucionální podpora: RVO:68081731
    Klíčová slova: Fabry-Perot cavity * ultra-low expansion * coeffiecient of thermal expansion * optical frequency comb
    Kód oboru RIV: BH - Optika, masery a lasery

    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.
    Trvalý link: http://hdl.handle.net/11104/0215506

     
     
Počet záznamů: 1  

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