Device and method for balanced beat detection of POP rubidium atomic clock

Abstract

The invention discloses a device for balanced beat detection of a POP rubidium atomic clock. A half slide and a polarization beam splitter are arranged on a DBR laser along a laser emergent direction.A first beam of linearly polarized light is reflected to a non-polarization beam splitter. A second beam of linearly polarized light enters an acousto-optic modulator, a quarter-slide, a zero-degreetotal reflection mirror in the original direction, returns to the polarization beam splitter in the original direction, and then enters a first 45-degree total reflection mirror. The light exit direction of the first 45-degree total reflection mirror is sequentially provided with a first high extinction ratio polarizer, a physical system, a second high extinction ratio polarizer, a second 45 degree total reflection mirror, a third 45 degree total reflection mirror, and the non-polarization beam splitter. The first polarized light and the second polarized light are correspondingly input into abalanced beat detector after being split and combined without the polarization beam splitter, and a signal of the detector is input to a data acquisition card. A detection method greatly improves signal-to-noise ratio of the signal of the POP atomic clock, enhances signal resistance to current noise, and can be applied to the field of atomic clock detection.

Description

technical field [0001] The invention belongs to the technical field of atomic clocks, and in particular relates to a device and method for detecting POP rubidium atomic clocks with balanced beats. Background technique [0002] The development of atomic clocks with small size, low power consumption and high performance has important positive significance for basic scientific research and industrial production, especially in high-resolution satellite navigation. Compared with crystal oscillators, atomic clocks have better long-term stability. good advantage. [0003] The POP rubidium atomic clock has three advantages of small size, low power consumption and high performance, and has been extensively studied in recent years. The basic principle is to use laser and microwave to interact with the atomic three-level system to generate the ground state energy level layout number difference and the coherence of the ground state. When the microwave frequency is exactly equal to the ...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the problem that the weak signal of the polarization detection method is easily affected by the AM and FM-AM noise generated by the laser, and then affect the stability of the atomic clock, and provide a reasonably designed, effective suppression of AM and FM-AM Device and method for balanced beat detection of POP rubidium atomic clock for AM noise, greatly improving signal-to-noise ratio of POP atomic clock signal, enhancing signal resistance to current noise generated by microwave cavity heating and other circuit noise capabilities

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