Phase Coherent Vacuum-Ultraviolet to Radio Frequency Comparison with a Mode-Locked Laser

Details Phase Coherent Vacuum-Ultraviolet to Radio Frequency Comparison with a Mode-Locked Laser Phase Coherent Vacuum-Ultraviolet to Radio Frequency Comparison with a Mode-Locked Laser

Apr 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000phrvl..84.3232r&link_type=abstract

Physical Review Letters, Volume 84, Issue 15, April 10, 2000, pp.3232-3235

Physics

86

Scientific paper

We demonstrate a versatile new technique that provides a phase coherent link between optical frequencies and the radio frequency domain. The regularly spaced comb of modes of a mode-locked femtosecond laser is used as a precise ruler to measure a large frequency gap between two different multiples (harmonics or subharmonics) of a laser frequency. In this way, we have determined a new value of the hydrogen 1S-2S two-photon resonance, f1S-2S = 2 466 061 413 187.29\(37\) kHz, representing now the most accurate measurement of an optical frequency.

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