High-performance pulse laser pumping rubidium clock optical system

Abstract

The invention discloses a high-performance pulse laser pumping rubidium clock optical system. An optical isolator is arranged in the light emitting direction of a laser diode; a first reflector is arranged in the light emitting direction of the optical isolator; one part of the light beam passing through the first reflector enters a frequency stabilization module through a first beam splitter, andthe other part enters a second beam splitter; one part of the light beam split by the second beam splitter enters a photoelectric detector, and the other part enters a second reflector; light reflected by the light beam through the second reflector enters an acoustic optical modulator, the acoustic optical modulator adopts a semiconductor refrigerator for temperature control, light emitted by theacoustic optical modulator enters a diaphragm, light emitted by the diaphragm enters a third reflector, and the light beam enters a beam expander after being reflected by the third reflector. A largenumber of temperature-sensitive components such as a phase delay sheet and a polarization beam splitter are effectively prevented from being used, and a Doppler background removing frequency stabilization scheme is adopted, so that the system has the advantages of compact volume, high reliability and low frequency and intensity noise.

Description

technical field [0001] The invention belongs to the technical field of bubble-type atomic clocks, and in particular relates to a high-performance pulsed laser-pumped rubidium clock optical system. Background technique [0002] The pulsed laser-pumped rubidium clock has the characteristics of high signal-to-noise ratio and small optical frequency shift coefficient, and is a new type of bubble-type atomic clock with certain potential. The optical system used for pulsed laser pumping needs to provide a light source with stable frequency and power on the one hand, and to generate pulsed light that meets the requirements through an acousto-optic modulator on the other hand. At present, researchers have developed an integrated optical system for pulsed laser pumping rubidium clocks, such as literature (Kang S, Gharavipour M, Gruet F, et al. Compact and high-performance Rb clock based on pulsed optical pumping for industrial application [C], Frequency Control Symposium&the Europea...

AI Technical Summary

Problems solved by technology

When the ambient temperature affects the refractive index of the crystal, the polarization direction of the laser will also change, resulting in a change in the splitting ratio of the polarization beam splitter. Therefore, the output frequency and power of this type of optical system are easily affected by changes in the ambient temperature.

In addition, for the frequency stabilization module of the above-mentioned optical system, the frequency stabilization effect is easily affected by the Doppler background, so it is usually necessary to select the absorption peak where the Doppler background changes less as a reference instead of selecting the maximum absorption peak as the reference. Reference, which affects the frequency stability of the optical system to some extent

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