Device and method for achieving minitype CPT atomic clock physical system

Abstract

The invention discloses a device for achieving a minitype CPT atomic clock physical system. The device comprises a Bias-Tee, a VCSEL, a first quarter wave plate, an atomic gas chamber, a second quarter wave plate, a polarization beam splitter, a first photoelectric detector and a second photoelectric detector. The invention further discloses a method for achieving the minitype CPT atomic clock physical system. Elliptically-polarized light is adopted for resonance with atom CPT, and difference detection is conducted on the optical rotation effect generated by the resonance. According to the device and method for achieving the minitype CPT atomic clock physical system, background noise generated by optical frequency components which do not interact with atoms in multi-color light output by the VCSEL and conversion noise generated by light interacting with the atoms due to light frequency jitter which is converted into signal amplitude jitter through action with the atoms are eliminated, and the signal to noise ratio of CPT resonance signals is greatly increased; in addition, the device and the method further have the advantages that the influence on the obtained CPT resonance signals by environment magnetic field intensity fluctuation is small, and laser frequency stabilization can be easily achieved through an achieved atomic clock.

Description

technical field [0001] The invention relates to the field of coherent population captive (CPT) atomic clocks, in particular to a device for realizing the physical system of the miniature CPT atomic clock, and also to a method for realizing the physical system of the miniature CPT atomic clock, which is suitable for implementing the physical system of the high-performance miniature CPT atomic clock. Background technique [0002] Compared with other types of atomic clocks, miniature CPT atomic clocks have great advantages in small size and low power consumption. Therefore, they are ideal frequency sources for handheld communicators, tiny drones, and tiny underwater detectors for marine resources. They are used in satellite navigation and positioning There are important applications in equipment, autonomous navigation equipment and communication network equipment. [0003] At present, the popular schemes for obtaining CPT resonance signals by miniature CPT atomic clocks are: mi...

AI Technical Summary

Problems solved by technology

There are two important shortcomings in this scheme: 1. In addition to the two optical frequency components that resonate with the atoms, the optical frequency components that are out of tune with the atoms are also detected, and the contribution of detuned light in the photoelectric signal is a strong useless light background ; 2. The bandwidth of the VCSEL output light is wide, and the strong frequency jitter is converted into amplitude fluctuations in the CPT signal, that is, frequency-amplitude conversion (FM-AM) noise is generated, resulting in poor quality of the obtained CPT resonance signal

However, there are two defects in the linearly polarized light differential method: 1. The atomic energy level used to prepare the CPT state moves with the magnetic field as a first-order Zeeman movement, so changes in the strength of the ambient magnetic field cause changes in the quality of the CPT resonance signal, and the accuracy of the realized atomic clock is affected by the ambient magnetic field larger

2. Laser frequency stabilization can only be performed by using the absorption spectrum of atoms in the excited state F=1, because the spectral line is weak and the dynamic range of frequency stabilization is small, resulting in poor shock and vibration resistance of the atomic clock

In addition, the spectral line is too weak to be identified for miniature atomic clocks, so the linear polarization differential method is not suitable for miniature atomic clocks

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