A direct rf to optical frequency measurement with a femtosecond laser comb spanning 300 THz

Summary form only given. We report an absolute measurement of the optical frequency of a stabilized Nd:YAG laser by measuring the gap between its fundamental f/sub 1064/ and second harmonic 2f/sub 1064/ using a fs laser frequency comb which has been broadened in a silica microstructure fiber. To our knowledge, this is the first ever direct rf to optical frequency measurement using a single optical frequency comb and it provides the means for compact optical frequency standards that are readily compared to the cesium microwave standard.