Realignment-free cryogenic macroscopic optical cavity coupled to an optical fiber

Review of Scientific Instruments, vol. 93, pp. 013103

Abstract

We present a cryogenic setup where an optical Fabry-Perot resonator is coupled to a single-mode optical fiber with coupling efficiency above 90% at mK temperatures without realignment during cooling down. The setup is prealigned at room temperature to compensate for the thermal contraction and change of the refractive index of the optical components during cooling down. The high coupling efficiency is achieved by keeping the setup rotation-symmetric around the optical axis. The majority of the setup components are made of Invar (FeNi36), which minimizes the thermal contraction. High coupling efficiency is essential in quantum optomechanical experiments.

Authors 5

1. Vitaly Fedoseev corresponding Aachen Huygens-Kamerlingh Onnes Laboratorium

   Leiden University

   Affiliation as printed

   Huygens-Kamerlingh Onnes Laboratorium, Leiden University 1 , 2333 Leiden, CA, The Netherlands

2. Matteo Fisicaro Aachen Huygens-Kamerlingh Onnes Laboratorium

   Leiden University

   Affiliation as printed

   Huygens-Kamerlingh Onnes Laboratorium, Leiden University 1 , 2333 Leiden, CA, The Netherlands

3. Harmen van der Meer Aachen Huygens-Kamerlingh Onnes Laboratorium

   Leiden University

   Affiliation as printed

   Huygens-Kamerlingh Onnes Laboratorium, Leiden University 1 , 2333 Leiden, CA, The Netherlands

4. W. Löffler Aachen Huygens-Kamerlingh Onnes Laboratorium

   Leiden University

   Affiliation as printed

   Huygens-Kamerlingh Onnes Laboratorium, Leiden University 1 , 2333 Leiden, CA, The Netherlands

5. Dirk Bouwmeester Aachen Huygens-Kamerlingh Onnes Laboratorium

   Leiden University · University of California, Santa Barbara

   Affiliation as printed

   Department of Physics, University of California 2 , Santa Barbara, California 93106, USA

   Huygens-Kamerlingh Onnes Laboratorium, Leiden University 1 , 2333 Leiden, CA, The Netherlands