Kovalchuk E V, Schuldt T, Peters A
Institut für Physik, Humboldt-Universität zu Berlin, Germany.
Opt Lett. 2005 Dec 1;30(23):3141-3. doi: 10.1364/ol.30.003141.
We combined a tunable continuous-wave optical parametric oscillator and a femtosecond Ti:sapphire laser frequency comb to provide a phase-coherent bridge between the visible and the mid-infrared spectral ranges. As a first demonstration of this new technique we performed a direct frequency comparison between an iodine-stabilized Nd:YAG laser at 1064 nm and an infrared methane optical frequency standard at 3.39 microm.
