High-Stability Rb Optical Clock Based on Pulse-Modulated Broad-Spectrum Comb-Tooth Laser

We have proposed a new scheme to realize the Rb optical clock using a pulse-modulated broad-spectrum multi-frequency laser. By applying a pulse-modulated signal to a 420 nm external cavity diode laser, a broad-spectrum comb-tooth laser with multiple frequency components is generated, which can interact with almost all the Rb atoms with different transverse velocities, so that more Rb atoms in the Rb cell can contribute to the frequency stabilization signal of the clock transition spectral line. The effective atomic number is expected to be improved by a factor of 10
²
- 10
³
, which will significantly improve the signal-to-noise ratio of spectrum, so as to optimize the frequency stability of Rb optical clock. The Rb optical frequency standard with high stability can be widely used in laser physics and precision measurement.