Atomic frequency standard detection method and system of cold atomic beam

Abstract

The invention relates to an atomic frequency standard detection method and system of a cold atomic beam, and belongs to the technical field of atomic frequency standards. The method comprises the steps that a cold atom beam is generated, the cold atom beam is acted by a state preparation and separation oscillation field, the cold atom beam comprises first atoms at a first energy level and second atoms at a second energy level, and the first energy level is higher than the second energy level; detection laser acts on a cold atom beam to obtain a first fluorescence signal and a second fluorescence signal, the first fluorescence signal is generated when a first atom jumps to an excited state energy level and falls back to a first energy level, and the second fluorescence signal is generated after a second atom is pumped to the first energy level, then is transited to the excited state energy level through the first energy level and then falls back to the first energy level; an atomic transition probability signal of the cold atom beam is calculated according to the first fluorescence signal and the second fluorescence signal; and the output frequency of the crystal oscillator is controlled according to the atomic transition probability signal. According to the atomic frequency standard detection method and system for the cold atom beam, the atomic frequency standard performance of the cold atom beam can be improved.

Description

technical field [0001] The invention relates to the technical field of atomic frequency standards, in particular to an atomic frequency standard detection method and system for cold atomic beams. Background technique [0002] The atomic frequency standard of the cold atomic beam includes: detecting the fluorescent signal of the cold atomic beam, and sending the fluorescent signal to the crystal oscillator as a deviation correction signal, thereby controlling the frequency of the crystal oscillator, wherein the detected cold atomic beam is After state preparation and separation by the action of an oscillating field. In the cold atomic beam frequency calibration process, the deviation correction signal will affect the stability of the output frequency of the crystal oscillator. [0003] The existing atomic frequency standard detection method of the cold atomic beam is to lock the laser frequency to a transition energy level of the atom through a detection laser beam, so as to...

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Problems solved by technology

[0004] However, because the fluorescence signal will be affected by changes in laser frequency, laser light intensity, and atomic beam flux, etc., the amplitude of the fluorescence signal will fluctuate, which will bring signal noise, which will affect the signal-to-noise ratio of the fluorescence signal, and then affect the crystal. Oscillator output frequency stability and atomic frequency standard performance of cold atomic beams

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