Saturated absorption Doppler broadening spectral line device

Abstract

A saturated absorption Doppler broadening spectral line device comprises a Lambda / 2 wave plate, a first polarization beam splitter, a first total reflection mirror, a second total reflection mirror, a third total reflection mirror, a second polarization beam splitter, a Lambda / 4 wave plate, a sample reservoir and a detector. According to the saturated absorption Doppler broadening spectral line device provided by the invention, the light beams of pump light and detection light completely coincide to obtain a higher signal to noise ratio; the spatial scale of the whole system is only limited by the size of an optical device and the sample reservoir, an optical path is more compactly and flexibly arranged, so that people can observe a precise level-structure spectral line of an atom or molecule.

Description

technical field [0001] The invention relates to a laser, which is a device for saturating, absorbing, and Doppler broadening spectral lines of an accurate and stable frequency discrimination source in a laser frequency stabilization system. Background technique [0002] At room temperature, due to the high speed of thermal motion of atoms and molecules, Doppler broadening becomes the main mechanism of spectral line broadening, which prevents us from obtaining spectral lines that can reflect its fine energy level structure. [0003] Saturated absorption de-Doppler broadens the spectrum, so that we can observe the spectral lines of the fine energy level structure of atoms and molecules, so that we can have a deeper understanding of the structure of atoms and molecules. In the laser frequency stabilization system, the hyperfine energy level structure spectrum line is widely used as a stable and accurate frequency source. At present, there are special commercialized devices for...

AI Technical Summary

Problems solved by technology

[0006] First, it takes up a lot of space

In order to obtain a signal with a high signal-to-noise ratio, we need to make the pump light and the probe light overlap as much as possible, but limited to the triangular optical path structure, this requires a very small angle between the pump light and the probe light , so a larger space is required

[0007] Second, the signal-to-noise ratio of the signal is not high

The pump light and the probe light cannot completely coincide, so a considerable part of the atoms are not pumped or not detected

[0008] Third, the distance between the probe light and the reference light is fixed and cannot be adjusted arbitrarily

The thickness of the thick mirror beam splitter is determined, which determines that the distance between the probe light and the reference light cannot be changed easily

[0009] Fourth, the light intensity balance between reference light and probe light is not easy to adjust

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