A laser frequency stabilization system

Abstract

The invention discloses a laser frequency stabilization system, belonging to the field of lasers. The system includes: a reference laser, a first electro-optic modulator, a first polarization beam splitter, a first half-wave plate, a Fabry-Perot interferometer, a second half-wave plate, a second polarization beam splitter, a second electro-optic Modulator and laser to be stabilized; Piezoelectric ceramics, the first driving source that outputs the first reference signal to the first electro-optic modulator, the first photoelectric unit that is arranged on the reflected optical path of the first polarization beam splitter prism, and the first oscillation signal A first mixer for mixing with the frequency signal output by the first photoelectric unit, a driving source for generating a voltage signal according to the signal output by the first mixer; a second driving source for outputting a second reference signal to the second electro-optical modulator The source is a second photoelectric unit arranged on the reflected optical path of the second polarization beam splitter, and a second mixer for mixing the second oscillation signal and the frequency signal output by the second photoelectric unit.

Description

technical field [0001] The invention relates to the field of lasers, in particular to a laser frequency stabilization system. Background technique [0002] Semiconductor lasers are important laser light sources in scientific research and industry. [0003] The linewidth of semiconductor lasers is about 10MHz, and its long-term drift index is >100MHz / 1h. In the research of laser cooling of atoms, it is usually required that the linewidth of semiconductor lasers is less than 1MHz or even 10kHz, and the drift within a few hours is also within 1MHz. . In order to meet the stability requirements of semiconductor lasers in related research, the following methods are usually used to achieve frequency stabilization of semiconductor lasers: saturation absorption frequency stabilization, Zeeman frequency stabilization, polarization spectrum stabilization, external cavity frequency stabilization and transmission cavity stabilization. frequency. [0004] Among them, the frequency ...

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Problems solved by technology

[0006] First, when the signal output by the photoelectric detector is input into the computer, if the acquisition rate of the data acquisition card is low, the delay of the feedback will be caused by the problem of transmission speed, and if the acquisition rate of the data acquisition card is high, it will cause cost Too high; second, piezoelectric ceramics are always in a scanning state, because the scanning of piezoelectric ceramics is nonlinear, therefore, the same scanning voltage may correspond to different scanning lengths of piezoelectric ceramics, and at the same time, due to the different lengths of piezoelectric ceramics The different voltage sensitivities of the transmission cavity may cause the insensitivity of the error signal, thus limiting the locking effect of the laser to be stabilized; third, the frequency stabilization of the transmission cavity can only control the long-term drift of the laser, and does not contribute to the narrowing of the laser linewidth not big

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