Transferring the stability of iodine-stabilized diode laser at 634 nm to radio frequency by an optical frequency comb

An optical frequency comb phase-locked on an iodine frequency stabilized diode laser at 634 nm is con structed to transfer the accuracy and stability from the optical domain to the radio frequency domain. An external-cavity diode laser is frequency-stabilized on the Doppler-free absorption signals of the hyperfine transition R(80)8-4 using the third-harmonic detection technique. The instability of the ultra-stable op tical oscillator is determined to be 7 x 10-12 by a cesium atomic clock via the optical frequency comb's mass frequency dividing technique.