A hybrid technique for ultra-high dynamic range interferometry

摘要

In this paper, we explore the optimization and implementation of multi-wavelength interferometers suchthat measurements beyond the largest beat wavelength can be achieved reliably. A hybrid beat wavelengthapproach is presented that also exploits wavelength coincidence between two beat wavelengths in order to measureunambiguously over an extended range. The performance of the approach has been explored both throughsimulations and experimental validation has been obtained using a fiber interferometer with 4 measurementwavelengths. The initial results have demonstrated 11200th of a fringe phase resolution giving absolute metrologyover 18.16 mm, or a dynamic range of 1 part in 2.4x10~6.