Document Type

Article

Publication Date

Fall 10-30-2000

Publication Title

Physical Review Letters

ISSN

0031-9007

Volume

85

Issue

18

First Page

3797

Last Page

3800

DOI

http://dx.doi.org/10.1103/PhysRevLett.85.3797

Abstract

Using an iodine-stabilized He-Ne laser as a transfer oscillator, we compare absolute measurements of the optical frequency from a traditional frequency synthesis chain based on harmonic generation and from the frequency division technique of an ultrawide bandwidth femtosecond frequency comb. The agreement between these two measurements, both linked to the Cs standard, is 220±770 Hz, yielding a measurement accuracy of 1.6×10−12. We report 473612353604.8±1.2 kHz as a preliminary updated value of the absolute frequency of the “ f” component for the He-Ne laser international standard at 633 nm.

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