Atomic clock frequency discrimination signal detection system

Abstract

The invention discloses an atomic clock frequency discrimination signal detection system. The detection system comprises an atomic clock control circuit system, a first optical system, a physical system, a second optical system and a microwave pulse synthesizer, the first optical system generates linearly polarized light; the physical system generates a frequency discrimination signal according tothe double-microwave pulse signal, and is used for realizing closed-loop locking of atomic clock frequency and rotating the polarization direction of linearly polarized light; the second optical system determines the component of the detection light which rotates after passing through the physical system in the vertical direction by using a photoelastic modulation technology; the atomic clock control circuit system determines an error voltage signal of atomic clock frequency closed-loop locking according to the component of the detection light in the vertical direction by using a cross-correlation detection technology; and the microwave pulse synthesizer generates a 6.8 GHz double-microwave pulse signal according to the error voltage signal. According to the invention, the photoelastic modulation technology and the cross-correlation detection technology are combined to improve the signal-to-noise ratio and the frequency stability of the atomic clock frequency discrimination signal.

Description

technical field [0001] The invention relates to the technical field of optical detection, in particular to an atomic clock frequency discrimination signal detection system. Background technique [0002] The rubidium atomic clock has the characteristics of low power consumption, small size, high reliability and compliance with satellite load requirements, and is very suitable for space applications as an on-board clock for satellite navigation systems. The pulsed light-pumped rubidium atomic clock separates the light pumping process from the microwave excitation process in time, allowing the light field and the microwave field to interact with the atoms separately, avoiding the coherent coupling of light and microwaves, and theoretically eliminating the optical frequency of the atomic clock. shift, and improve the medium and long-term stability of the atomic clock. [0003] The patent No. CN102799103A "rubidium atomic clock with high-contrast frequency discrimination signal"...

AI Technical Summary

Problems solved by technology

However, due to the limited length of the rubidium bubble in the physical system, the rotation angle of the detected polarized light is very small, resulting in a small absolute intensity of the light intensity signal and a low signal-to-noise ratio

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