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Ultra narrowband atomic filter and filtering method realization method

An atomic filter, ultra-narrowband technology, applied in the field of optoelectronics, to achieve the effect of eliminating the influence

Active Publication Date: 2018-09-14
LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
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Problems solved by technology

[0004] The 420nm atomic transition and the 780nm transition have a common ground state energy level, and the atomic high-excited state transition line with a weaker oscillator intensity is transferred to the lower excited state transition line of an atom with a stronger oscillator intensity by using the speed transfer effect of the atom , can realize ultra-narrowband FADOF, the bandwidth is around tens of MHz to one hundred MHz, so far, there is no report in this regard

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  • Ultra narrowband atomic filter and filtering method realization method

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Embodiment Construction

[0032] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0033] The principle of the present invention is: the laser light corresponding to the atomic transition wavelength with weaker oscillator strength is used as pump light, and the laser light corresponding to the atomic transition wavelength with stronger oscillator intensity is used as probe light, interacting with atoms, and moving the oscillator through the speed transfer effect. The weaker atomic high excited state transition line is transferred to the higher oscillator intensity atomic lower excited state transition line, combined with the Faraday effect, when the probe light passes through the atomic filter, a magneto-optical rotation occurs , output the target optical signal corresponding to the pump laser.

[0034] Based on this principle, the ultra-narrow-band Faraday anomalous dispersion atomic optical filter provided by the present invention incl...

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Abstract

The invention discloses an ultra narrowband atomic filter and a filtering method realization method. In the technical scheme, the velocity transfer effect of atoms is used to transfer an atomic highly-excited state transition spectrum line with weak oscillator strength to an atomic lowly-excited state transition spectrum line with strong oscillator strength, Faraday effects are combined, magneto-optic rotation happens to detection light through the atomic filter, and target light signals corresponding to pump laser are outputted. The pump light uses a saturated absorption spectrum for frequency stabilization, and the size of a magnetic field can be strictly controlled by changing the magnitude of current. Rubidium bubbles are placed in a magnetic shielding box to eliminate influences of the magnetic field. Compared with the traditional atomic filter, the atomic filter is narrower in passband bandwidth and better in filtering effects.

Description

technical field [0001] The invention belongs to the technical field of optoelectronics, and relates to an ultra-narrow-band Faraday anomalous dispersion atomic optical filter realized by utilizing atomic velocity transfer effect and Faraday effect and a method for realizing optical filtering. Background technique [0002] In laser communication, light will attenuate due to factors such as dispersion and absorption during transmission, and the signal will be very weak when it reaches the receiving system. The role of the filter is to extract the weak narrowband light signal from the strong broadband background light. The use of optical filters to transmit optical signals can effectively suppress background light noise, improve the signal-to-noise ratio of signals in a receiving system, and at the same time improve the detection sensitivity of the receiving system. [0003] Faraday anomalous dispersion atomic filter (FADOF) is currently the most studied and widely used atomic...

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Application Information

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IPC IPC(8): H01S3/094H01S3/10H01S3/227H01S3/098G02F1/09
CPCG02F1/09H01S3/094H01S3/10061H01S3/1115H01S3/227
Inventor 崔敬忠涂建辉张盛楠陈景标陈大勇客洪亮
Owner LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
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