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Ultra-long free evolution time cold atom frequency standard device and method

A cold atom, free technology, applied in the direction of automatic power control, electrical components, etc., can solve the problems of limiting the stability index of the cold atom frequency scale and the limited free evolution time of cold atoms, so as to increase the free evolution time and solve the The effect of short evolution time and reasonable method

Active Publication Date: 2020-11-06
BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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  • Application Information

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Problems solved by technology

Therefore, the free evolution time of cold atoms will be limited, which limits the further improvement of the stability index of cold atom frequency standards

Method used

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  • Ultra-long free evolution time cold atom frequency standard device and method
  • Ultra-long free evolution time cold atom frequency standard device and method
  • Ultra-long free evolution time cold atom frequency standard device and method

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Embodiment approach

[0043] As a possible implementation, the cold atom preparation device includes an atom source 1, a laser 3 and a magneto-optical trap cooling assembly 5;

[0044] Atom source 1 for providing atoms;

[0045] The magneto-optical trap cooling component 5 is used to cool down the atoms provided by the atom source 1 to complete the preparation of cold atoms 10;

[0046] The laser 3 is used for ejecting the cold atoms 10 in the vertical direction, providing the static cold atoms with a moving speed in the vertical direction, and converting the static cold atoms into high-energy state cold atoms.

[0047] First, the magneto-optical trap cooling component 5 cools the atoms provided by the atom source 1 to the uK level and loads them into cold atoms 10 , and the cold source atoms at this time are static cold atoms. The laser 3 will provide the upper polishing beam 4 for the cold atoms 10. Under the action of the upper polishing beam 4, the cold atoms 10 obtain a certain macroscopic lo...

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Abstract

The invention discloses an ultra-long free evolution time cold atom frequency standard device and an ultra-long free evolution time cold atom frequency standard method, relates to the technical fieldof cold atom frequency standards, and aims to solve the problems that the cold atom free evolution time is limited and the stability index of a limited cold atom frequency standard is poor in an existing mode. The ultra-long free evolution time cold atom frequency standard device comprises a cold atom preparation device, a cold atom transition assembly, a grating assembly and a signal collector, wherein the cold atom preparation device is used for preparing high-energy-state cold atoms with vertical upward speed; the cold atom transition assembly transitions the high-energy-state cold atoms into low-energy-state cold atoms and provides microwave pulses for the low-energy-state cold atoms; the grating assembly is used for trapping the low-energy-state cold atoms and limiting the spatial displacement and diffusion of the low-energy-state cold atoms until the rising speed of the low-energy-state cold atoms becomes zero; the cold atom transition assembly is used for carrying out secondarymicrowave pulse on cold atoms which freely fall into the cold atom transition assembly; and the signal collector collects the energy state distribution of the prepared high-energy-state cold atoms, and collects microwave frequency signals contained in the cold atoms which freely fall and pass through the cold atom transition assembly.

Description

technical field [0001] The invention relates to the technical field of cold atomic frequency standards, in particular to an ultra-long free evolution time cold atomic frequency standard device and method. Background technique [0002] The cold atom frequency standard mainly uses the interaction of the separated oscillation field between the cold atom and the microwave to generate a frequency discrimination curve, so that the local oscillator outputs a frequency signal with high stability and high accuracy. The line width of the central stripe of the frequency discrimination curve is inversely proportional to the free evolution time of the cold atoms, and the stability of the output frequency of the local oscillator is inversely proportional to the line width of the central stripe, that is, the stability of the output frequency of the local oscillator is inversely proportional to the cold atom is proportional to the free evolution time of . Therefore, the free evolution time...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/26
CPCH03L7/26
Inventor 王秀梅李晶周铁中刘亚轩王亮高连山
Owner BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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