Patent ID: 8143956

Claim:
A method for generating an atomic clock at an optical frequency based on an atomic beam, comprising: ejecting an atomic beam from a mouth of an oven after heating an atomic oven in a vacuum chamber; transferring particles in the atomic beam from a ground state of clock transition to an excited state of the clock transition by a pump laser having a frequency corresponding to a frequency of the clock transition in an adiabatic passing mode to generate a first excited atomic beam, and the first excited atomic beam being interacted with a clock laser having a frequency corresponding to the frequency of the clock transition to generate a second excited atomic beam; the second excited atomic beam passing a detection region with a detection laser, wherein a frequency of the detection laser corresponds to one strong transition spectral line related to a clock transition energy level of the atomic clock, and the frequency of the detection laser is higher than the frequency of the clock laser, particles in the second excited atomic beam give off fluorescence photons of spontaneous emission after the second excited atomic beam moves to the detection region and interacts with the detection laser, and the emitted fluorescence photons is detected by a photoelectric receiving system; and modulating the frequency of the clock laser which is used to detect frequency of the clock transition, and locking the frequency of the clock laser at spectrum of the clock transition according to the detected fluorescence photons so as to implement the atomic clock.