Optical fiber type CPT (Coherent Population Trapping) atomic clock physical system

Abstract

The invention provides an optical fiber type CPT (Coherent Population Trapping) atomic clock physical system. The system comprises a pigtail VCSEL, a fiber optic attenuator, an optical fiber one fourth wave plate, an atomic gas chamber component and a pigtail photoelectric detector; the fiber optic attenuator is connected with the pigtail VCSEL through optical fibers; the optical fiber one fourth wave plate is connected with the fiber optic attenuator through the optical fibers; the atomic gas chamber component is connected with the optical fiber one fourth wave plate through the optical fibers; the pigtail photoelectric detector is connected with the atomic gas chamber component through the optical fibers; the atomic gas chamber component comprises an atomic gas chamber, a C field coil, a metal thermostatic bath and a magnetic shielding strip. Compared with the prior art, the optical fiber type CPT atomic clock physical system provided by the invention has the advantages that coaxial installing in the prior art is not needed, the difficulty of installing and light path debugging is reduced, and the installation size is small; in addition, interaction of light and alkaline metal atoms in the optical fibers in a process of total-reflection in the optical fibers for multiple times can be realized by the atomic gas chamber, and a signal-to-noise ratio is improved, thereby improving the stability of outputting a CPT optical signal.

Description

technical field [0001] The invention relates to the technical field of miniaturized atomic frequency standards, in particular to an all-fiber type CPT atomic clock physical system. Background technique [0002] Optical fiber is an abbreviation for optical fiber, which is a fiber made of glass or plastic that can be used as a light transmission tool. The principle of transmission is total reflection of light. Kao Kung, former president of the Chinese University of Hong Kong, and George A. Hockham first proposed the idea that optical fibers could be used for communication transmission, for which Kao Kung won the 2009 Nobel Prize in Physics. [0003] Optical fiber technology generally consists of three parts: an optical signal transmitting end, an optical fiber for transmitting optical signals, and an optical signal receiving end. Fiber optic technology is represented in all three sections. Optical fiber sensing technology is a new technology that uses the optical fiber that...

AI Technical Summary

Problems solved by technology

This requirement increases the difficulty of installing and debugging the optical path, and affects the frequency stability of the atomic clock

[0009] 2. When the temperature of the atomic gas cell is constant, in the interaction between light and alkali metal atoms, in order to improve the signal-to-noise ratio of the CPT signal, it is necessary to increase the length of the interaction between light and atoms, because the collimated light is parallel To improve the signal-to-noise ratio of light, the only way to increase the length of the atomic gas chamber is to increase the size and power consumption of the atomic clock.

[0010] 3. The heater of the atomic gas chamber usually adopts a double-strand parallel heating wire wound around the atomic gas chamber or a MOS tube placed on the side of the atomic gas chamber. It is easy to generate an electrostatic magnetic field during heating, which directly interferes with the internal magnetic field of the atomic gas chamber and affects the output of the atomic clock. Stability of CPT signal

[0011] 4. Since the atomic gas chamber is made by traditional glass blowing technology, a small glass tip must be formed at the sealing port where the alkali metal and buffer gas are injected. The asymmetric structure of the atomic gas chamber will affect the structure of the CPT atomic clock. compactness and stability

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