Atomic ground state hyperfine Zeeman frequency measuring device and method

Abstract

The invention discloses an atomic ground state hyperfine Zeeman frequency measuring device and method, belonging to the field of atomic frequency standard. The atomic ground state hyperfine Zeeman frequency measuring device comprises an optical radiation module, a filtering module, a fission transition module, an optical detection module and a main control computation module, wherein the optical radiation module is used for enabling an atom generate radiation light; the spectral line of the radiation light comprises two hyperfine structural components; the filtering module is used for filtering out one of the two hyperfine structural components by using an isotope of the atom so as to obtain the filtered radiation light; the fission transition module is used for performing fission and resonance transition on the atom in a microwave cavity under the action of the magnetic field and a radio frequency signal and under the radiation of filtered radiation light; the atom in the microwave cavity is the same as the atom in the optical radiation module; the optical detection module is used for detecting the intensity of the radiation light penetrating through the fission transition module in real time and generating a light intensity signal; the main control computation module is used for supplying the radio frequency signal to the microwave cavity, obtaining an absorption spectral line of the atom according to a corresponding relationship between the radio frequency signal and the light intensity signal and computing the atomic ground state hyperfine Zeeman frequency according to the absorption spectral line.

Description

technical field [0001] The invention relates to the field of atomic frequency standards, in particular to a device and method for measuring ultrafine Zeeman frequency of atomic ground state. Background technique [0002] The Zeeman effect is a phenomenon in which the energy levels of atoms split under the action of an external magnetic field. After the Zeeman effect occurs in the atom, the transition frequency between the hyperfine energy levels of the ground state is called the hyperfine Zeeman frequency of the atomic ground state. [0003] With the wide application of rubidium atomic frequency standards, it is usually necessary to measure the hyperfine Zeeman frequency of the ground state of rubidium atoms as a reference frequency value for quantum frequency discrimination of atomic clocks. Existing methods for measuring the hyperfine Zeeman frequency of the ground state of rubidium atoms include: 87 The glass bubble of Rb is placed in a microwave resonant cavity with a ...

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Problems solved by technology

[0005] due to gaseous 87 The number density of Rb particles is small, and the particle number difference between the two hyperfine energy levels obtained by using the existing measurement method at room temperature is very small, so the obtained atomic absorption line is very weak. According to the measurement of the absorption line There is a certain error in the hyperfine Zeeman frequency of the ground state of the rubidium atom

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