OPTICAL FREQUENCY (WAVELENGTH) STANDARD, BASED ON GROUP OF He-Ne/~(127)J_(2) LASERS WITH λ=633 nm

摘要

In the report there is discussed a group standard of primary standards for linear measures, compiled of three He-Ne/~(127)J_(2) lasers and instruments for measurements and registration, to keep and reproduce the operation of the standard of wavelength for interferometer measurements of length. For some reasons our choice was He-Ne/~(127)J_(2) laser (λ=633nm), stabilised upon, hyperfine structure components of rotation line R127 of vibration band 11 - 5 of J_(2) saturated absorption. The principal one was its high radiation frequency reproduction and a widespread application of He-Ne lasers with the same wavelength in laser interferometers. It permits to certify successfully other radiation sources and physical linear measures with sufficient accuracy. The value of the length unit is transferred from the group standard to all physical linear measures, gauge blocks and marking gauges with the help of interferometric measurements.