Fountain type cold atomic clock

Abstract

The invention relates to the technical field of atomic clocks, and discloses a fountain type cold atomic clock. On one hand, an atomic energy state selection mechanism is changed into an optical pumping state selection mechanism, an atomic state selection structure and a fluorescence detection structure can be combined into one, and then a state selection microwave cavity structure commonly used for the fountain type cold atomic clock can be removed, so that the overall height of a physical system structure is greatly reduced, the size and the weight of the atomic clock are effectively reduced, and movement, popularization and use are facilitated; and on the other hand, due to the fact that the atomic utilization rate is greatly improved through the optical pumping state selection, the number of atoms used for microwave inquiry is multiplied, the signal-to-noise ratio of a spectral line is increased, then the index influence caused by the fact that the line width of the spectral line is increased due to height reduction is counteracted, the index potential of the accuracy and the stability is equivalent to that of a current fountain type cold atomic clock, and the performance of the atomic clock cannot be affected due to height reduction.

Description

technical field [0001] The invention belongs to the technical field of atomic clocks, in particular to a fountain-type cold atomic clock. Background technique [0002] Time and frequency measurement is of great significance to modern national defense construction and the development of various fields in the national economy. Atomic clock is a frequency output and timing device, which is an indispensable and important component in the modern information society. Its stability and accuracy will affect the performance of communication, navigation and positioning, and missile guidance systems. Since laser cooling technology was applied to the field of atomic clocks, fountain-type cold atomic clocks have been successfully built by various laboratories in the world. It uses cold atomic groups as working substances, which greatly eliminates the effects of Doppler frequency shift and collision frequency shift. At the same time, the fountain-type working method increases the interac...

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Problems solved by technology

[0004] In order to solve the problem that the volume and weight of the current fountain-type cold atomic clock are too large, which is not conducive to movement and popularization, the purpose of the present invention is to provide a new fountain-type cold atomic clock based on optical pumping state selection, which

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