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Committee 1: Standards of Wavelength

Published online by Cambridge University Press:  25 April 2016

B. Edlen

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Experiments on Lamb-dip stabilization of the 6328 Å He-Ne laser line made at NBS, NPL and PTB and reported in a joint paper (10) show that the wavelength from different lasers may differ by as much as one part in 107. Similar work on a C02 laser line at 10.6 μm and a xenon line at 3.5 μm is reported from NPL, the 1.15 μm line in a pure Ne 20 laser has been investigated at JILA (5), and several lines in a xenon ion laser are being studied at PTB. However, the method that holds the greatest promise of accuracy and stability is the use of saturated absorption to lock a laser wavelength to some molecular transition having a sharply defined and stable wavelength. Thus the 6328 Å He-Ne laser line can be fixed on a line in the molecule 127I2 (6, 7), and the 3.3913 μm line of a He-Ne laser has been connected to a line of CH4, promising a unique precision and stability according to experiments made at JILA (5) and NRC. This technique will evidently yield excellent substitutes for the Kr 86 line, and may, when the time is ripe, lead to the adoption of an improved primary standard.

Type
Research Article
Information
Transactions of the International Astronomical Union , Volume 14 , Issue 1 , 1970 , pp. 125 - 127
Copyright
Copyright © Reidel 1970

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