Method and device for implementing Ramsey-CPT atomic frequency standard by microwave periodic On-Off modulation VCSEL

Abstract

The invention discloses a method and a device for implementing a Ramsey-CPT atomic clock by microwave On-Off modulation VCSEL. The method comprises the following steps of: A, coupling direct current and microwave to a laser tube, scanning the direct current to obtain a plurality of absorption peaks and locking the direct current; B, switching on and off the microwave to realize equivalent laser pulse, and scanning the microwave to obtain Ramsey-CPT stripes; and C, locking the microwave to obtain stable frequency output. The device is characterized in that: a current source is connected with a Bias-Tee, a microwave source is connected with the Bias-Tee through a microwave switch, the Bias-Tee is connected to a laser generating device, the output laser passes through a physical system and then enters a laser detection device, and control equipment is connected with the current source, the microwave source, the microwave switch and the laser detection device respectively. The method and the device realize laser-atom periodic interaction through microwave On-Off, have a more predominant frequency discrimination curve compared with the traditional CPT scheme, and implements the atomic block with higher stability. Compared with the Ramsey-CPT atomic clock implemented by using the AOM with larger volume and higher power consumption, the device has a simple structure, adopts a unique method, is easy for microminiaturization, and overcomes the key technology of the chip Ramsey-CPT atomic clock.

Description

Technical field [0001] The present invention relates to the field of atomic frequency standards, and more specifically to a method for implementing the Ramsey-CPT atomic frequency standard by microwave On-Off, and also to a device for implementing the Ramsey-CPT atomic frequency standard. The method and device can be applied to atomic frequency standards, especially miniaturized high-performance chip-level atomic frequency standards (CSAC), and can also be used in precision measurement equipment such as magnetometers, and has broad application prospects in precision measurement. Background technique [0002] Microwave modulates the vertical cavity surface emitting laser (VCSEL) to produce coherent polychromatic light. The interaction between the two-color light composed of positive and negative first-order sidebands and atoms can produce a coherent population trap (CPT) state, thereby obtaining electromagnetic induction Transparency (EIT) phenomenon. The EIT spectral line can be...

AI Technical Summary

Problems solved by technology

However, the existing Ramsey-CPT atomic frequency standard uses an acousto-optic modulator (AOM) as an optical switch to generate pulsed laser light. Due to the large size and high power consumption of the AOM, the miniaturization and low-cost of the Ramsey-CPT atomic frequency standard are limited. The development of power consumption atomic frequency standard

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