Digitalized laser phase-locking device and phase-locking method

Abstract

The invention discloses a digital laser phase-locking device, which mainly comprises the components of a laser, a beam splitter, a photodetector, a biased junction, a directional coupler, an amplifier, an integrated phase-locked loop frequency synthesizer, an external reference source, a digital PID control module, a computer and the line, wherein the components are connected with a circuit through optical paths to form a whole body of the digitalized laser phase-locking device, and an electrical phase-locked loop is expanded to a laser frequency to lock the phase of the digitalized laser phase-locking device. The digitalized laser phase-locking device adopts the integrated phase-locked loop frequency synthesizer to ensure that controlled difference frequencies are different from one another from dozens of trillions to 7 GHz; the digital PID control module is used for realizing that a computer controls the phase-locking process, adjusts the parameters of the digital PID control module and changes the phase-locking position; and the operation is convenient, the optical paths are simple, and only one beat frequency optical path is needed.

Description

technical field [0001] The invention relates to the relative phase locking technology of two lasers, in particular to a digital phase locking device and a phase locking method. Background technique [0002] In many fields such as precision spectroscopy, coherent optical measurement, matter wave interferometry, and quantum computing, two laser beams with very precise frequency differences are required. In order to obtain such a coherent beam, the traditional method is to use an acousto-optic frequency shifter (AOM) or an electro-optic modulator (EOM), but the frequency difference must be preset, and the acousto-optic frequency shifter or electro-optic modulator of the corresponding frequency band is selected , once on the shelf, it is not easy to change. In addition, traditional frequency shifting devices cannot achieve very high frequency shifting, and AOMs up to hundreds of megahertz are very expensive, and there are no corresponding frequency shifting devices for higher f...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the frequency of traditional optical frequency shifting devices is fixed and not high enough, to realize the laser phase locking technology mainly composed of integrated phase-locked loop frequency synthesizer and digital PID, and to broaden the application range of two laser beams with precise frequency difference

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