Some Experimental Factors Affecting the Reproducibility and Stability of Methane-Stabilized Helium-Neon Lasers
The frequency of the methane-stabilized helium-neon laser was first measured by Evenson et al (1). In June 1973, their result was combined by the Comité Consultatif pour la Définition du Mètre (2,3), with the results of four independent measurements of its wavelength, to give a recommended value for the speed of light (c = 299 792 458 ms−1) with an uncertainty of 4 parts in 109.
KeywordsBeat Frequency National Physical Laboratory Frequency Offset Methane Pressure Laser Stability
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- 3.Com. Consult. Définition Mètre, (Com. Int. Poids. Mesures), 5th Session, (1973).Google Scholar