Saturation absorption frequency discrimination device

Abstract

The invention relates to a saturation absorption frequency discrimination device, which comprises a lambda / 2 wave plate, a polarization beam splitter prism, a lambda / 4 wave plate, a saturation absorption cell and a wedge-shaped quartz glass plate along the input direction of a laser beam coaxially in turn, wherein the front surface of the wedge-shaped quartz glass plate is vertical to the laser beam, incident light beams are reflected by the front surface and the back surface of the wedge-shaped quartz glass plate to form a detection beam and a reference beam respectively, a photoelectric detector is arranged in the reflection direction of the detection beam of the polarization beam splitter prism, and the detection beam and the reference beam are received by the photoelectric detector. The saturation absorption frequency discrimination device has the advantages of simplified optical path, small floor space, convenient use, easy implementation of Zeeman effect frequency discriminationand frequency shift, and no appearance of light blocking.

Description

Technical field [0001] The present invention involves a saturated absorption of frequency. It is used in semiconductor laser steady frequency and is a non -linear laser spectrometer technology and precision laser spectrum technology field. Background technique [0002] At present, the use of saturated absorption effects stable laser frequency is very common in the cold atom physics laboratory.Using saturated absorption effects can obtain atoms or molecular absorption lines that are not widened by Doppler effects, such as some ultra -fine structural spectral lines.The width of the spectrum line is very narrow, which can reach the magnitude of the natural line width (MHz).These scores can provide a stable external reference frequency, which stabilizes the frequency of laser to 1MHz or below. [0003] Saturation absorption is a non -linear optical effect.When a strong laser (relative to the saturated light of the absorption medium) is incident on the absorption medium, the absorptio...

AI Technical Summary

Problems solved by technology

In terms of optical path stability, two mirrors are required on the optical path of the pump light, which is not conducive to the stability of the optical path

If you want to use the Zeeman effect for frequency shift or frequency discrimination, you need to add a set of coils to the absorption cell, which will increase the space occupied by the absorption cell, which may block the pump light or need to readjust the optical path, and the saturated absorption signal may deteriorate

In addition, this kind of optical path occupies a large volume, which is not conducive to compressing the optical path.

Images