Optical pumping rubidium atomic clock based on modulation transfer spectrum frequency stabilization laser, and preparation method thereof

Abstract

The invention discloses an optical pumping rubidium atomic clock based on modulation transfer spectrum frequency stabilization laser, and a preparation method thereof. The optical pumping rubidium atomic clock comprises a narrow linewidth laser, a beam expander, a half wave plate, a polarization beam splitting prism, a phase modulator, a rubidium atomic bubble for laser frequency stabilization, ahigh-speed photoelectric detector, a mixer, a high-speed servo feedback circuit, a radio frequency signal source, a laser driving power supply, a convex lens, an acoustic optical modulator, a rubidiumatomic bubble for obtaining a clock transition spectral line, a crystal oscillator frequency synthesizer and a control circuit part; the radio frequency signal source generates a modulation signal, the modulation signal is input into the phase modulator to perform phase modulation on pumping laser, meanwhile, a demodulation signal is generated to perform mixing demodulation with the signal from the photoelectric detector to obtain an error signal, and the laser driving power supply is controlled by the high-speed servo feedback circuit to realize high-stability narrow linewidth laser based ona modulation transfer spectrum. The laser subjected to frequency stabilization is used as the pumping laser of the optical pumping rubidium atomic clock to obtain a high-performance optical pumping rubidium atomic clock.

Description

technical field [0001] The invention belongs to the technical field of microwave atomic clocks and microwave quantum frequency standards. A high-performance narrow-linewidth laser with modulation transfer spectrum and frequency stabilization is used as the pumping laser and detection laser of an optically pumped rubidium atomic clock to realize a high-performance optically pumped Rubidium atomic clock. Background technique [0002] Although the rubidium atomic frequency standard can only be used as a secondary frequency standard, the structure of its quantum part is very simple, easy to manufacture and mass-produce, easy to miniaturize and low in price, so although it can only be used as a secondary frequency standard, it is But has a wide range of applications. Frequency stability is the most important index to measure the performance of an atomic clock. Therefore, the frequency stability of an optically pumped rubidium atomic clock based on a modulated transfer spectrum f...

AI Technical Summary

Problems solved by technology

[0003] At present, lasers with wide linewidths are usually used in the world, combined with frequency stabilization techniques such as saturated absorption spectroscopy or polarization spectroscopy, and the frequency-stabilized lasers are used as pumping lasers and probe lasers for laser-pumped rubidium atomic clocks, but the linewidth is relatively large. A wide laser will introduce frequency noise to the clock system, which restricts the improvement of the signal-to-noise ratio of the clock transition line

In addition, the saturation spectrum frequency stabilization technology usually requires internal modulation of the laser, which will also introduce additional frequency noise, and the stability of the frequency-stabilized laser is limited by the bandwidth of the feedback loop; The problem of changing parameters such as power, and the frequency stabilization technology is also limited by the feedback loop bandwidth; so the laser and frequency stabilization technology commonly used at present limit the further improvement of the stability index of laser-pumped rubidium atomic clocks

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