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Direct measurement of the absolute frequency of the international reference laser BIPM4

Long-Sheng Ma1,3, Susanne Picard1, Massimo Zucco1,4, Jean-Marie Chartier1, Lennart Robertsson1,5 and Robert S Windeler2

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Direct phase-coherent measurements of the absolute frequency of the 11-5, R(127) transition in 127I2 at 633 nm of the BIPM4 He–Ne laser have been made. This laser has been used as a reference laser for a large number of international comparisons over the years and, as such, has served as the connecting point for the national implementation of the SI metre in the member states of the Metre Convention. The frequency value found for the f-component was 473 612 353 605.4 kHz with a combined uncertainty of 1.8 kHz, a value in close agreement with the value adopted for this radiation in the list of recommended radiations for the realization of the metre, which is 473 612 353 604 kHz.


PACS

42.55.Lt Gas lasers including excimer and metal-vapor lasers

42.60.Lh Efficiency, stability, gain, and other operational parameters

42.65.Re Ultrafast processes; optical pulse generation and pulse compression

06.20.F- Units and standards

42.60.Jf Beam characteristics: profile, intensity, and power; spatial pattern formation

Subjects

Instrumentation and measurement

Optics, quantum optics and lasers

Dates

Issue 1 (February 2004)

Received 22 July 2003

Published 16 December 2003



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