Microwave phase modulation locking atomic clock

Abstract

A microwave phase modulation locking atomic clock comprises a controlled crystal oscillator, a frequency doubling synthesizer, a modulation oscillator, a timing sequence generator, a quantum system, a data acquisition processor and a proportion integration difference controller, and is characterized in that the modulation oscillator is a microwave phase modulation oscillator. The microwave frequency of the atomic clock is not changed, so that the transition signal to noise ratio of the atomic clock is improved, and then the frequency stability of the atomic clock is improved.

Description

technical field [0001] The invention relates to a microwave atomic clock, in particular to a microwave phase modulation locked atomic clock. Background technique [0002] The history of the development of atomic clocks can be traced back to around World War II. It mainly benefited from the rapid development of quantum mechanics and microwave spectroscopy at that time. Early microwave clocks used incoherent light sources as pumping light and probe light. Later, with the development of lasers, laser state selection and detection methods were applied to atomic clock research in order to obtain better results. The rubidium atomic frequency standard has been widely used due to its high short-term stability, small size and portability. The existing pulsed light pumped atomic frequency standards adopt a three-level structure, such as figure 1 shown. For example, when an atomic clock uses 87 When the Rb atomic medium is used, the technology of separating the laser 01 and the mi...

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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