Extension of Absolute Frequency Measurements to the cw He–Ne Laser at 88 THz (3.39 μ)

1 February 1972

journal article
research article
Published by AIP Publishing in Applied Physics Letters

Vol. 20 (3) , 133-134
https://doi.org/10.1063/1.1654077

Abstract

The highest absolute frequency measurement yet reported is described. The frequency of the 3.39‐μ line from a He–Ne laser oscillating at the methane absorption frequency was found to be 88.376245 (55) THz. The frequency was measured by beating the 88‐THz radiation with the R(30) line from a cw CO₂ laser and a 48‐GHz klystron in a tungsten‐on‐nickel point‐contact diode. The speed of light calculated from this frequency and previous wave‐length measurements is in agreement with the accepted value and of comparable accuracy.

Keywords

This publication has 7 references indexed in Scilit:

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