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System and method for improving atomic clock frequency stability

A technology of frequency stability and atomic clocks, which is applied to instruments using atomic clocks, etc., can solve the problems of optical frequency shift and affect the performance of atomic clocks, and achieve the effect of eliminating optical frequency shift and improving frequency stability

Active Publication Date: 2017-05-31
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the atomic clock scheme he adopted, continuous microwaves and light act on the atomic system at the same time, so there is an optical frequency shift, and the spectral line width is affected by the laser and microwave power, which affects the performance of the atomic clock

Method used

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  • System and method for improving atomic clock frequency stability
  • System and method for improving atomic clock frequency stability
  • System and method for improving atomic clock frequency stability

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the embodiments and accompanying drawings, but the protection scope of the present invention should not be limited thereby.

[0032] see first figure 1 , figure 1 It is the principle block diagram of pulsed light pumped atomic clock. The optical system 1 generates light pulses to enter the physical system 2 to interact with rubidium atoms. The microwave frequency synthesizer 3 generates microwave pulses to enter the physical system to interact with the atoms. The microwave pulses and light pulses are separated in time to interact with the atoms, thereby eliminating the optical frequency shift. , the atomic clock control system 5 detects forward scattered light passing through the physical system 2 . The atomic clock control system 5 generates optical power control timing to control the optical pulses output by the optical system, and the generated microwave power and frequency control timing con...

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Abstract

The invention discloses a system for improving atomic clock frequency stability. The system comprises an optical system, a physical system, a microwave frequency synthesizer, a controlled crystals and atomic clock control system. Quantum states are prepared by the aid of optical pulse, atomic states are probed by the aid of pi / 2 of microwave pulses, the time interval of the two microwave pulses is T, a Ramsey stripe is acquired based on orthogonal polarized light detection technology, line width of the Ramsey stripe is 1 / (4T), the line width is decreased one half as compared with usual 1 / (2T) line width, so that the frequency stability of an atomic clock is improved. The system can remove optical frequency shift, restrain laser noise and compact the line width of Ramsey stripes, so that the frequency stability of the atomic clock is improved.

Description

technical field [0001] The invention relates to a passive bubble type atomic clock, in particular to a system and method for improving the frequency stability of the atomic clock. The present invention can obtain Ramsey fringes with a linewidth of 1 / (4T) (T is the time interval between two microwave pulses), which is half the usual 1 / (2T) linewidth, thereby increasing the frequency of the atomic clock stability. Background technique [0002] Applications such as navigation and positioning, high-speed wireless communication, and high-resolution spectroscopy are increasingly demanding more stable time-frequency signal sources. Rubidium atomic clocks have been widely used due to their high frequency stability, small size, and portability. [0003] For a pulsed atomic clock, the Allan variance characterizing its frequency stability can be expressed as: [0004] [0005] where τ is the sampling time, T C is the duty cycle of the atomic clock, Q=v 0 / Δv is the quality fact...

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Application Information

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IPC IPC(8): G04F5/14
Inventor 林海笑邓见辽林锦达张松董功勋王育竹
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI