Rubidium atom optical clock based on pulse modulation wide-spectrum multi-frequency laser and implementation method

Abstract

The invention discloses a rubidium atom optical clock based on pulse modulation wide-spectrum multi-frequency laser and an implementation method. The rubidium atom optical clock comprises a power supply control system, a 420 nm pulse modulation wide-spectrum multi-frequency laser system, a modulation transfer spectrum frequency stabilization system, a laser detection module and a laser phase discrimination and high-speed servo control circuit. A wide-spectrum comb-shaped laser containing a plurality of frequency components is generated by applying a pulse modulation signal to a clock laser system; and the wide-spectrum comb-shaped laser interacts with rubidium atoms of different velocity groups to obtain more rubidium atoms contributing to a clock transition spectral line, and the atom utilization efficiency is improved, so that the signal-to-noise ratio is greatly improved, and the stability of the rubidium atom optical clock is effectively improved.

Description

technical field [0001] The invention relates to the technical field of optical frequency atomic clocks and optical frequency quantum frequency standards, in particular to a rubidium atomic optical clock for pulse-modulating wide-spectrum multi-frequency lasers and a realization method thereof. Background technique [0002] Among the alkali metal elements, rubidium atoms have the advantages of low melting point, high reserves, and easy extraction. Generally, a hot atom gas chamber can be used to heat it above room temperature to prepare enough saturated vapor pressure for the realization of an atomic clock system. In addition, the rubidium atomic spectral line is simple, and more atoms can contribute to the clock transition signal. Because of this, rubidium atoms are one of the most commonly used quantum references for atomic clocks. [0003] In the prior art (atomic beam optical clock detected by pulsed wide-spectrum clock laser and its implementation method, patent number:...

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Problems solved by technology

[0006] The first problem solved by the present invention is to solve the technical problem that only a few atoms in the ground state contribute to the transition line in the prior art, resulting in low utilization rate of atoms, thereby limiting the further improvement of the system stability index, by applying pulses to the 420nm clock laser system Modulates the signal to generate a broad-spectrum comb-shaped laser with multiple frequency components

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