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

A technology of atomic vapor and atomic vapor bubbles, which is applied in the field of weak optical signals, can solve the problems of increasing the complexity of the device, achieve superior filtering characteristics, reduce bit error rate, and simple structure

Active Publication Date: 2010-08-04
WUHAN INST OF PHYSICS & MATHEMATICS CHINESE ACADEMY OF SCI
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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

Method used

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

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Embodiment Construction

[0045] Below in conjunction with accompanying drawing, the method for collective Raman-enhanced atomic vapor filter signal of the present invention is described in detail, and its steps are:

[0046] (a) The horizontally polarized pumping laser 2 is incident through the narrow-band polarizing beam splitter (NB-PBS) 3 placed in the same polarization direction, and its transmission direction is changed by the total reflection mirror 4 and the total reflection mirror 5 successively to irradiate the part of the size of the external beam. Magnetic field on the atomic vapor bubble 7 .

[0047](b) After a beam of vertically polarized weak signal light 1 from the communication transmitter is incident, it first passes through the first Glan-Thompson prism 6 placed in the same direction of polarization, and then enters the part-sized external magnetic field The atomic vapor bubbles 7 on.

[0048] (c) There is no magnetic field in the front part of the atomic vapor bubble 7 with partial...

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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...

Claims

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Application Information

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IPC IPC(8): G02F1/09G02F1/39
Inventor 孙献平谭政罗军詹明生
Owner WUHAN INST OF PHYSICS & MATHEMATICS CHINESE ACADEMY OF SCI
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