Unimodal 87 Rb isotopic atomic filter used for laser frequency stabilization and filter method thereof

Abstract

The invention relates to a unimodal 87 Rb isotopic atomic filter used for laser frequency stabilization and a method for filtering by adopting the atomic filter. The filter consists of components of an external cavity laser 1, an optical isolator 2, a first semipermeable semi-reflective mirror 3, a second semipermeable semi-reflective mirror 4, a first high reflectivity mirror 5, a natural rubidium cell 6 and the like. According to the unimodal 87 Rb isotopic atomic filter used for laser frequency stabilization and the filter method thereof, by using the Faraday anomalous dispersion effect of isotopic 87 Rb ground state atoms in a magnetic field, a uniform magnetic field is generated through a magnetic field source, such as a permanent magnet, and the laser and atoms are interacted, so the laser polarization direction is changed. The laser transmission polarization direction is limited by two polarizing prisms, the light wave with specific frequency is chosen, and the goal of filtering is achieved. A system is enabled to be in a good working condition through a temperature control system. The unimodal atomic filter has the advantages of simple structure, high filtering performance, work stability, long service life and the transmission rate of being more than 78.0%. The unimodal 87 Rb isotopic atomic filter used for laser frequency stabilization and the filter method thereof have important significance in the experiment with interaction between light and atoms.

Description

technical field [0001] The invention belongs to the field of atomic light filtering technology and laser technology. More specifically, the present invention relates to a unimodal 87 The Rb isotope atomic filter also relates to a method of using the atomic filter for light filtering. Background technique [0002] Faraday anomalous dispersion atomic filter has the advantages of high transmittance, ultra-narrow linewidth, and high noise suppression, so it is often used in occasions with strict requirements on signal-to-noise ratio, such as atmospheric laser communication, space communication, laser spectroscopy, laser technology , quantum information, metrology, biology, medicine, basic experiments, etc. [0003] In addition, atomic optical filters can also be used in laser frequency stabilization, making the laser immune to fluctuations and changes in current and temperature. The output light passing through these atomic filters is able to stay away from the absorption lin...

AI Technical Summary

Problems solved by technology

The technique uses atoms of the alkali metal rubidium, which includes the isotope 87 Rb and 85 Rb, the isotope that most scientific research works on 87 Rb, isotope 87 The abundance of Rb in natural rubidium is only 27.8%, while the isotope 85 The abundance of Rb is as high as 72.2%, so the isotope 85 Rb would have an unnecessary impact

[0006] The main technical problem of the existing single-peak atomic filter is that it is not enough to realize that one transmission peak completely corresponds to the isotope 87 A single transmission peak atomic filter of Rb atomic absorption spectrum for laser frequency stabilization

In addition to the inability to match the spectral lines, existing single-peak atomic filters such as the core work mode require a magnetic field of more than 1,000 Gauss and a temperature above 150°C, which brings difficulties to the application.

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