1.5-micron waveband polarization pump atomic light filter

Abstract

The invention belongs to the technical field of atomic light filtration and particularly relates to a 1.5-micron waveband polarization pump atomic light filter. The atomic light filter makes the magneton energy level of the atomic excitation state of alkali metal to generate atomicity difference through polarization of pumping light, the atomicity difference will bring about circular double fraction, and thus incident light has the rotation effect, and the light filtering function is achieved. Specifically, the emphasis is laid on the most common 1.5-micron waveband laser signals of a communication waveband, alkali metal rubidium atoms are selected as working atoms, Rb86 is pumped from 5S1 / 2 to 5P3 / 2 with a 780-nm semiconductor laser, and the polarization pump atomic light filter of the communication waveband is manufactured through the transition from 5P3 / 2 to 4D3 / 2 of Rb87. Because light is filtered in a polarization pumping mode, the light filtering function can be achieved by the light filter without a magnetic field, a magnetic field part structure in a traditional light filter is omitted, so that the structure of the light filter is simplified, and the 1.5-micron waveband polarization pump atomic light filter can be used in special situations with no need for a magnetic field.

Description

technical field [0001] The invention belongs to the technical field of atomic light filtering, and in particular relates to a polarization-pumped atomic light filter of 1.5 μm wave band. Background technique [0002] Traditional optical filters, such as interference filters, have a wide passband width, on the order of 10nm; and crystal filters made of birefringence effect, the filtering bandwidth is inversely proportional to the crystal thickness, increasing the crystal thickness will shrink Receiving the solid angle and increasing the loss in the passband, it is difficult to meet the requirements of narrow bandwidth and high transmittance at the same time. In addition, using the ultra-narrow-band resonance characteristics of atoms to develop optical filter devices, ARF (atom resonance filter, atomic resonance filter), has the disadvantages of slow response speed and incapable of imaging. [0003] In 1991, a new type of atomic optical filter - FADOF (Faraday anomalous dispe...

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Problems solved by technology

[0002] Traditional optical filters, such as interference filters, have a wide passband width, on the order of 10nm; and crystal filters made of birefringence effect, the filtering bandwidth is inversely proportional to the crystal thickness, increasing the crystal thickness will shrink Receiving solid angle and increasing loss in the passband, it is difficult to meet the requirements of narrow bandwidth and high transmittance at the same time

In addition, using the ultra-narrow-band resonance characteristics of atoms to develop optical filter devices, ARF (atom resonance filter, atomic resonance filter), has the disadvantages of slow response speed and incapable of imaging

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