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Optical frequency measurements using fs-comb generators
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DOI：10.1109/TIM.2004.843417.png)
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We have used a Ti:Sapphire-based fs-comb generator to measure the frequencies of several optical frequency standards available at PTB. The frequency values for HeNe- and frequency-doubled Nd:Yag lasers stabilzed to Iodine hyperfine transitions as well as the frequencies of the S-1(0)-P-3(1) transition of Ca-40 at 657.5 nm (456 THz) and the S-2(1/2) - D-2(3/2) transition of Yb-171(+) at 435.5 nm (688 THz) are presented. Comparing our results with previously published data for the frequency variation of transitions of the Hg+ ion and H atom, we have derived a new upper limit of the variation of the fine structure constant alpha.
Keyword:
femtosecond (fs) lasers
optical frequency comb
optical frequency measurement
stabilized lasers
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5.9
论文数:
2.0W
被引数:
5.8W
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Absolute frequency measurement of the 435.5-nm 171Yb+-clock transition with a Kerr-lens mode-locked femtosecond laser.png)
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