A cathode lamp faraday anomalous dispersion atomic filter and its preparation method

Abstract

The invention discloses a cathode modulation Faraday anomalous dispersion atom light filter which comprises a hollow cathode lamp, a drive current source, a permanent magnet or an electromagnetic coil, a polarizer and an analyzer. The hollow cathode lamp is connected with the drive current source, the permanent magnet and the electromagnetic coil are placed at the front end and the rear end of the hollow cathode lamp respectively, and spacings are arranged between the permanent magnet and the hollow cathode lamp and between the electromagnetic coil and the hollow cathode lamp. The analyzer is placed at the rear end of the hollow cathode lamp, and the polarizer is placed at the front end of the hollow cathode lamp. The polarization direction of the analyzer is perpendicular to the polarization direction of the polarizer. A magnetic field generated by the permanent magnet or the electromagnetic coil can generate an optical rotation effect on incident light signals, polarization rotating of signal light is achieved, hence, the light signals can be extracted and noise signals can be isolated. The cathode modulation Faraday anomalous dispersion atom light filter is simple and easy to implement, low in cost, high in performance, and stable to work. The number of available atom types is increased, and the obtained atom light filter is of great significance to the fields of laser frequency stabilization, biomedical science detection and the like.

Description

technical field [0001] The invention relates to atomic light filtering technology, laser technology and optoelectronic technology, in particular to a Faraday anomalous dispersion atomic light filter prepared by using a hollow cathode lamp and a preparation method thereof. Background technique [0002] In the process of space optical communication, underwater optical communication, and lidar remote sensing, optical signals are easily interfered by stray light such as sunlight and stars. The function of the optical filter is to shield the interference light of other frequencies other than the signal optical frequency. Inferiority directly affects the quality of communication. [0003] Compared with traditional interference filters and birefringent crystal filters, atomic filters have the advantages of large field of view, narrower line width, specific frequency selection, small size, compact structure, and long-term stability. It has been widely used in atmospheric laser comm...

AI Technical Summary

Problems solved by technology

[0007] In short, the existing FADOF that uses glass bubbles to fill atoms has few types of atoms that can be used, and high melting point atoms such as iron cannot be used; the existing FADOF that uses atomic beams has weak signals and complex equipment is difficult to apply

Due to the structure of the hollow cathode lamp, a variety of high melting point elements, such as calcium, strontium, barium, ytterbium, erbium, neodymium, silver, indium, cadmium, aluminum, magnesium and iron, can be used directly. For FADOF, there is almost no direct photoresponse to laser light, and there is currently no technical solution for using hollow cathode lamps to make atomic filters

Images