Abstract
We demonstrated an optical frequency synthesizer based on a femtosecond (fs) mode-locked Ti:sapphire (Ti:s) laser by simultaneously stabilizing the carrier-offset frequency, <TEX>$f_{ceo}$</TEX>, and repetition rate, <TEX>$f_{ rep}$</TEX>, referenced to the Cs atomic frequency standard. By using two wide-band digital phase-detectors we realized a phase-coherent link between <TEX>$f_{rep} and f_{ceo} with the relation f_{ceo} = f_{AOM} 5/6f_{rep} ≡ 0, where f_{AOM} = 5/6f_{rep}$</TEX> is the phase-locked driving frequency of an acousto-optic modulator (AOM) in a self-referencing interferometer and <TEX>$f_{rep}$</TEX> = 100 MHz. As a result, we could stabilize all components of the fs laser comb at once with an equal frequency separation <TEX>$f_{rep}$</TEX> = 100 MHz with <TEX>$f_{ceo}$</TEX> = 0. In our optical frequency synthesizer, the frequency of the nth component (<TEX>$f_{n}$</TEX>) is given exactly by the simple relation <TEX>$f_n = nf_{rep}$</TEX>, enabling us to use the fs laser comb as a frequency ruler in the optical frequency metrology.
© 2003 Optical Society of Korea
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