Method and device for stabilizing laser frequency and power

Abstract

The invention discloses a method and a device for stabilizing laser frequency and power. The method comprises the following steps of: obtaining primary diffracted light, and radiating the primary diffracted light into a photoelectric detector; detecting the intensity of the primary diffracted light; processing a detected signal; sending the processed signal to a driving source; and enabling an output signal of the driving source to act on an acoustic optical modulator. The device comprises a laser, the acoustic optical modulator, an electrooptical modulator, a polarization splitting prism, a quarter-wave plate and a Fabry-Perot interferometer. The method and the device have the advantages that reference precision and stability are greatly improved, better power stabilizing effect is realized, and frequency stabilizing effect is improved.

Description

technical field [0001] The invention relates to the field of stabilizing laser frequency and power, in particular to a method and device for stabilizing laser frequency and power. Background technique [0002] The relative frequency accuracy and stability of the frequency standard are inversely proportional to the nominal frequency f, and the light wave frequency is 4-5 orders of magnitude higher than the microwave frequency. The frequency standard (rubidium, hydrogen, cesium clock) is the same, then the Q (=f / Δf) value used to stabilize the spectrum line is tens of thousands to hundreds of thousands of times that of the microwave frequency standard, that is, the stability of the optical frequency standard is theoretically predicted The accuracy and accuracy are 4-5 orders of magnitude higher than microwave frequency standards, which is the reason why optical frequency standards are developing very rapidly. At the same time, with the development of ultra-narrow linewidth la...

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Problems solved by technology

In this power stabilization method, the primary light of the second acousto-optic modulator AOM2 is not used, because the output frequency of the third driving source itself may not be stable enough, thus affecting further frequency stabilization

[0007] However, in this traditional stabilization method, two acousto-optic modulators are usually used to stabilize the laser power and frequency respectively, which increases the complexity of the optical path and circuit. At the same time, the analog voltage reference in the power stabilization circuit may not be stable enough. After experiments, it is also found that its power stabilization effect is not enough to meet our requirements, and the laser passes through two acousto-optic modulators, which will also cause a part of the waste of optical power

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