A falling cold atomic clock device based on a pyramidal magneto-optical trap and its working method

Abstract

The present invention discloses a pyramidal magneto-optical trap drop type cold atomic clock device. The pyramidal magneto-optical trap drop type cold atomic clock device comprises: a pyramid magneto-optical trap, wherein the pyramid magneto-optical trap comprises a pyramid mirror, a pair of reverse Helmholtz coils respectively arranged on the upper and lower sides of the pyramid mirror, a quarter-wave plate on the lower side of the lower reverse Helmholtz coil, and a convex lens and an optical fiber arranged on the lower side of the quarter-wave plate from top to bottom; a microwave cavity system arranged between the lower reverse Helmholtz coil and the quarter-wave plate, wherein the microwave cavity system comprises a microwave cavity, and a first cutoff waveguide and a second cutoff waveguide respectively connected with the upper and lower sides of the microwave cavity; an ultra-high vacuum holding system, wherein the ultra-high vacuum holding system comprises an ion pump in communication with the pyramid magneto-optical trap and the microwave cavity system through a vacuum conduit; and an atomic source, wherein the atomic source is arranged adjacent to the back of the pyramidmirror. According to the pyramidal magneto-optical trap drop type cold atomic clock device provided by the present invention, a pyramid magneto-optical trap is used, and the optical path is simplified, so that the pyramidal magneto-optical trap drop type cold atomic clock device has a simpler optical path and geometric structure, and a smaller volume.

Description

technical field [0001] The invention belongs to the technical field of atomic clocks, and in particular relates to a falling cold atomic clock device based on a pyramidal magneto-optical trap and a working method thereof. Background technique [0002] Modern timekeeping systems, both on the ground and on the Global Positioning Satellite System, rely heavily on atomic clocks. Traditional atomic clocks use hot atoms as working substances, and their accuracy and stability are affected by the thermal motion of atoms, making it difficult to further improve. At present, they are close to the theoretical limit. For example, the long-term stability of the best performance of commercial cesium beam clocks is still 10 -14 order of magnitude, with an accuracy of 5×10 -13 . [0003] The use of laser cooling technology can cool the temperature of atoms to close to absolute zero, reduce the speed of motion of atoms, increase the Ramsey interaction time between atoms and microwaves, and ...

AI Technical Summary

Problems solved by technology

[0005] Although cold atoms have many advantages such as environmental isolation and the ability to greatly improve measurement accuracy, the laser cooling device for atoms and its supporting optical systems are often bulky, making it difficult to miniaturize and practicalize

At present, the fountain clock based on cold atoms can only be defined as seconds in the laboratory, and it is difficult to carry and run for a long time

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