A Double Bubble Microwave Cavity with Rubidium Frequency Standard

Abstract

The invention discloses a high-performance dual-bubble microwave cavity for a rubidium frequency scale. The dual-bubble microwave cavity is characterized in that a filtering bubble and an absorption bubble are respectively positioned at two sides of the microwave cavity and are fixed in a medium barrel; a C field coil is coiled on a C field coiling rod for two layers; the C field coil and the C field coiling rod are fixed in the medium barrel; a coupling ring is fixed on a cavity cover board; one end of the coupling ring is electrically connected to a snap-off diode, and the other end of the coupling ring is connected to an external radio frequency signal; a total reflection prism is fixed between the coupling ring and the cavity cover board; a first photocell a is fixed below the absorption bubble for detecting the intensity of light passing through the absorption bubble, and a second photocell b is fixed on one side, coated with a half-reflection half-transmitting film, of the total reflection prism; pumping light enters from a small hole in the bottom of a magnetic screen barrel; after the pumping light is filtered through the filtering bubble, the pumping light is reflected by the total reflection prism; and a light path is changed by 180 degrees and the light is vertically irradiated into the absorption bubble. The dual-bubble microwave cavity has the following advantages of capabilities of promoting monochromaticity of the pumping light, stabilizing the light intensity of a spectral lamp, reducing the optical frequency shift and improving the stability index of the rubidium frequency scale, and also has the advantages of simple structure and convenient use.

Description

technical field [0001] The invention relates to the technical field of atomic frequency standards, and more specifically relates to a high-performance rubidium frequency standard double-bubble microwave cavity, which is especially suitable for communication, time-frequency measurement, and navigation synchronization. Background technique [0002] As a device that provides high-stability time-frequency signals, the atomic frequency standard is the core component of time-frequency. Among many frequency standards, rubidium atomic frequency standards have been more and more widely used in national economic fields such as communication, navigation, measurement, and power synchronization due to their low power consumption, small size, and low price. [0003] With the increasing application of rubidium atomic frequency standards, the research and improvement on it are also deepening, and the work mainly focuses on improving its performance and miniaturization. Among many applicati...

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Problems solved by technology

but due to gaseous 87 The number density of Rb particles is small, |F=2, m F =0> and |F=1, m F =0>The distance between the two energy levels is small, and the particle number difference between the two energy levels is very small at room temperature, so the absorption line obtained through this device is very weak, and the bubbles 87 The broadening of the spectral lines caused by the movement and collision of Rb atoms is also large, which greatly affects the short-term stability of the frequency standard

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