Method and device for strengthening atom steam optical filtering signals by combined Raman

Abstract

The invention discloses a method and a device for strengthening atom steam optical filtering signals by combined Raman. The method combines two characteristics of atom excited Raman gain and Faraday anomalous dispersion effect of atom steam in a single atom steam bubble. The device for realizing the method comprises a narrow band polarization beam splitter, two holophotes, an atom steam bubble with an external magnetic field with a part of size, an aperture slot with adjustable pore size and a pair of Gran Thomson prisms. In the invention, the atom steam optical filtering signals are strengthened by above 10 times in the atom steam bubble with the external magnetic field with a part of size through vertical direction of weak signal light and pump laser polarization and matching frequency, and scattered light and passband external background light of pumping lasers are inhibited by an optical polarization device, therefore, the device has the advantages of high suppression ratio (-105), adjustable optical filtering wavelength and the like. The invention remarkably enhances the atom steam optical filtering characteristic and the detection sensitivity and has important significance to application in the fields of remote laser communication, free space quantum communication and the like.

Description

technical field [0001] The present invention relates to the technical field of weak optical signals, more specifically to a method for collective Raman-enhanced atomic vapor filtering signal, and also to a device for collective Raman-enhanced atomic vapor filtering signal, which is specifically applicable to free space quantum communication , Atmospheric laser communication and fluorescent laser radar need to extract weak light signals in strong, wide-spectrum background light. Background technique [0002] Quantum communication, which uses the polarization, phase or spin state of photons to encode classical information, has absolute security in theory, and its development trend is to realize long-distance and high-efficiency information transmission. Global quantum communication can be realized through ground-to-satellite and star-to-satellite communication. Because the background light (sunlight, moonlight or starlight) in atmospheric space has the characteristics of high...

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Problems solved by technology

However, due to the combination of two atomic steam bubbles, it is necessary to equip two independent temperature control modules (for regulating, controlling and measuring the temperature to make it work at a suitable atomic number density) to match the two atomic steam bubbles respectively. The working parameters of the bubble, thus increasing the complexity of the device

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