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Working equation for a Fabry-Perot cavity based optical pressure standard

Yuanchao Yang, Patrick F. Egan, Tom Rubin
  • Abstract:
    From basics of Fabry-Perot (FP) resonator and roundtrip phase, a complete working equation for a FP cavity based optical pressure standard (OPS) is derived and presented which includes corrections of reflection phase-shift, diffraction and pressure-induced distortion. The correction from diffraction, i.e. Gouy phase, is negligible. To operate an OPS as a primary standard, two unknown parameters, i.e. mirror dispersion coefficient ϵ_α and pressure distortion coefficient d_m, in the working equation should be determined independently. Methods to determine ϵ_α and d_m are described and applied to an OPS developed at the National Institute of Metrology (NIM), China. Thermodynamic effect observed in the determination of d_m is also discussed.
  • Keywords:
    Fabry-Perot; refractometry; fixed-length; optical cavity; force-balanced; piston gauge; optical pressure; standard
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  • DOI:
    tc16-2023.09

Event details:

  • IMEKO TC:
    TC16
  • Event name:
    TC16 Conference 2023
  • Title:

    7th Conference on Pressure and Vacuum Measurement (together with the CCM - the Consultative Committee for Mass and Related Quantities of the BIPM)

  • Place:
    Washington DC, UNITED STATES
  • Time:
    15 May 2023 - 19 May 2023