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The two highest cw absolute frequency measurements as yet reported are described. Frequencies of the P(18) and P(20) 10.6-μm lines from a cwCO2 laser were found to be 28.359800 THz and 28.306251 THz±0.000025 THz, respectively. The frequencies were measured by beating each of these lines with 3.8-THz (78μm) and 10.7-THz (28μm) radiation from a water vapor laser and a 26- to 28-GHz klystron in a tungsten-on-nickel point contact diode.
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Evenson et al. (1970) studied this question.
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