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Frequency determination of visible laser light by interferometric comparison with upconverted CO2 laser radiation

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Abstract

A servocontrolled 1-m plane-parallel Fabry-Perot interferometer has been developed at NPL for the precise intercomparison of laser wavelengths. This instrument has been used to measure the wavelength ratio of a 679-nm radiation and that from a 633-nm iodine-stabilized He–Ne laser, achieving an accuracy of 2.9 parts in 1011. The 679-nm light was derived from a stabilized CO2 laser radiation by upconversion, and the wavelength of this 9.3-μm laser radiation can be calculated from the visible wavelength result. Frequency measurements on the same CO2 laser radiation have already been made in this laboratory, so that the experiment reported here leads to a precise value for the speed of light in vacuum and to the value of 473, 612, 380.5 ± 0.3 MHz for the absolute frequency of the visible radiation from a He–Ne laser stabilized to component d of127I2.

© 1978 Optical Society of America

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