DEFORMATION COMPENSATION OF A STABILIZED RESONATOR UNDER HIGH PRESSURE CHANGE BASED ON A MODIFIED POUND-DREVER-HALL METHOD

• Abstract:

  Recently, the resolution of length measurements based on optical interferometry reached sub-nanometer order. However, the accuracy of the optical interferometry is limited by the knowledge of absolute air refractive index. In this work, we have proposed a method to measure the absolute air refractive index by measuring the free-spectral-range and the resonance frequency of a Fabry-Perot cavity, whose inside is filled by vacuum and by air. During the air refractive index measurement, the geometrical length of the Fabry-Perot cavity must be constant in vacuum and in air. In this paper, a compensation of the Fabry-Perot cavity length deformation owing to a large pressure difference between air and vacuum is proposed.
• Keywords:

  air refractive index, Fabry-Perot cavity, Free spectral range, Resonance frequency, Pound-Drever-Hall method
• Download:

  IMEKO-TC14-2014-08.pdf
• DOI:

  _unreg_tc14-2014.08

Event details:

• IMEKO TC:

  TC14
• Event name:

  TC14 LMPMI Symposium 2014
• Title:

  11th Symposium on Laser Metrology for Precision Measurement and Inspection in Industry

• Place:

  Tsukuba, JAPAN
• Time:

  3 September 2014 - 5 September 2014