Stable Optical Cavities for Wavelength References;Technical note

摘要

The use of stable, calibrated optical reference cavities to supply interferometer users with more precisely known optical wavelengths in air is considered. Several resonance wavelengths of an air-spaced ring cavity were determined by frequency measurements in a vacuum by use of a femtosecond-laser comb followed by corrections to account for atmospheric pressure and cavity temperature. A design of a new stable ring cavity is discussed that allows for the longitudinal mode index to be determined by difference-frequency measurements between the S and P polarized modes.