Two-photon transition rubidium atomic clock

Abstract

The invention discloses a two-photon transition rubidium atom clock. A microwave transition adopts delta m=2 base state F=1, mF=-1 to F=2, mF=1 or F=1, mF=1 or F=2, mF=-1 dual-microwave-photon transition as a clock transition frequency instead of the non-traditional delta m=0 base state F=1, mF=0 to F=2, mF=0 single-microwave-photon transition. At a magic magnetic field, an one-order Zeeman shiftof the dual-microwave-photon transition is equal to 0, and an two-order Zeeman shift coefficient is less than 0-0 transition; the frequency shift is negative kHz level, thus the positive frequency shift caused by buffer gas is counteracted; the influence of the outside stray magnetic field fluctuation on the rubidium atom clock is reduced. The two-photon transition rubidium atom clock comprises avoltage control crystal oscillator, a microwave frequency synthesizer, a radio frequency signal source, a quantum frequency identifying module, a microprocessor and a compensation module; in the quantum frequency identifying module, the radio frequency field, the microwave field and the laser field are axial; the static magnetic field is perpendicular to the axial direction, thus the delta m=2 clock transition is realized. The two-photon transition rubidium atom clock can improve the stability and the accuracy of the rubidium atom clock.

Description

Technical field [0001] The invention belongs to the technical field of atomic clocks, and particularly relates to a two-photon transition rubidium atomic clock. Background technique [0002] The atomic clock is the product of the highly integrated quantum physics and electronics, and is one of the most prominent achievements of spectroscopy in technical applications. The relative accuracy and accuracy of time-frequency measurement based on it far exceeds the accuracy of other physical quantities. For this reason, people often try to convert other physical quantities, such as length, temperature, voltage, etc., into frequency (time) for measurement to improve Its accuracy. The atomic clock not only has a wide range of applications in navigation, communication, positioning, etc., but also a necessary tool for precise experiments to determine physical constants and verify physical theories (such as quantum electrodynamics, relativity, etc.). [0003] Among them, the most widely used...

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Problems solved by technology

Theoretical calculation at 25 Torr, the relationship between microwave frequency shift and temperature and the relationship between frequency shift temperature coefficient and pressure ratio are shown in figure 2 (a) and figure 2 (b), when the buffer gas ratio is At 60°C, the first-order coefficient of microwave frequency shift with temperature is 0, and the air pressure frequency shift is 4.5kHz at this time, and with the change of buffer gas pressure and temperature, the output frequency accuracy of the rubidium atomic clock is very poor; and the buffer gas frequency The temperature sensitivity of the shift severely limits the medium and long-term stability of rubidium atomic clocks

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