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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 7×10~(-12)by a cesium atomic clock via the optical frequency comb’s mass frequency dividing technique.
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 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 × 10 ~ (-12) by a cesium atomic clock via the optical frequency comb’s mass frequency division technique.