Microwave Phase Modulation Locking Atomic Clocks

Abstract

A microwave phase modulation locked atomic clock, which consists of a controlled crystal oscillator, a frequency multiplier synthesizer, a modulating oscillator, a timing generator, a quantum system, a data acquisition processor and a proportional-integral-derivative controller, characterized in that the modulating oscillator The invention is a microwave phase modulation oscillator, and the microwave frequency of the atomic clock in the present invention is unchanged, which helps to improve the signal-to-noise ratio of the atomic clock transition, and further improves the frequency stability of the atomic clock.

Description

Technical field [0001] The invention relates to a microwave atomic clock, in particular to a microwave phase modulation locking atomic clock. Background technique [0002] The development history of the atomic clock can be traced back to around the Second World War. It was mainly due to the rapid development of quantum mechanics and microwave spectroscopy at that time. Early microwave clocks used incoherent light sources for pumping light and detection light. Later, with the development of lasers, laser state selection and detection methods were applied to the research of atomic clocks in order to obtain better results. Rubidium atomic frequency standards have been widely used due to their short-term stability, small size and portability. The existing pulsed light pumped atomic frequency standard adopts a three-level structure, such as figure 1 Shown. For example, when the atomic clock is used 87 In the case of Rb atomic medium, the technology of separating the laser 01 and th...

AI Technical Summary

Problems solved by technology

For example, for the microwave frequency, when the positive and negative detuning of the microwave frequency are equal, theoretically, the interaction strength between the microwave and the atom is equal. different, that is, the phase shift of the cavity; another reason is that the velocity of the atom will produce different detuning, which makes the microwave deviate from its center frequency, and the theoretical positive and negative detuning effects are no longer equal, thus affecting the clock. Transition signal, which in turn affects the performance of atomic clocks

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