Ultra narrow band excited state faraday anomalous dispersion atom filter of communication band
An atomic filter and communication band technology, applied in the field of space optical communication, can solve the problems of high environmental conditions, poor adaptability, complex optical paths, etc., and achieve the effects of good long-term stability, reduced requirements, and high pumping efficiency
Inactive Publication Date: 2014-05-28
PEKING UNIV
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Problems solved by technology
[0011] The technical problem to be solved by the present invention is: for the existing excited-state Faraday anomalous dispersion atomic optical filter, how to effectively improve the pumping efficiency of the excited-state atomic optical filter and overcome the complexity of the optical path caused by the pump laser frequency stabilization module , high environmental requirements, poor adaptability and low practicability
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[0047] In order to make the purpose, content, and advantages of the present invention clearer, the specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0048] First, with regard to the accompanying drawings of the present invention, figure 1 Schematic diagram of the atomic transition lines used for the Rb atomic filter in the communication band. figure 2 It is a schematic diagram of the phenomenon of multiple absorption bands from the ground state energy level to the first excited state energy level of the Rb atom. image 3 Schematic diagram of the spectral lines for the phenomenon of magnetically induced multiple transition line coincidence generated by a simple theoretical model. Figure 4 A schematic diagram of a circularly polarized differential signal obtained from a simple theoretical model. Figure 5 It is a schematic diagram of the spectral line of the phen...
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The invention belongs to the technical field of optical space communication, particularly relates to an ultra narrow band excited state faraday anomalous dispersion atom filter of a communication band, and aims at effectively improving the pumping efficiency of the excited state atom filter and overcoming the problems of complicated light path, high demands on an environmental condition, poor adaptability and low practicability caused by a pump laser frequency stabilization module. An external frequency stabilization module is removed by the filter while an Rb atomic vapor absorption peak inside the filter is utilized as a frequency standard. Thus, the ultra narrow band excited state faraday anomalous dispersion atom filter is simpler in structure, better in work stability and higher in efficiency. The scheme is combined with a generation principle of a multi-transition absorption band, and the targeted frequency stabilization mod is adopted, so that a good pumping effect can be obtained.
Description
technical field [0001] The invention belongs to the technical field of space optical communication, and in particular relates to an ultra-narrow-band excited state Faraday anomalous dispersion atomic optical filter in the communication band. Background technique [0002] The function of the optical filter is to extract the weak narrow-band optical signal from the strong broadband background light. One of the key components in the core. In order to effectively suppress background light noise such as solar radiation, black body radiation, scattered light caused by scattering media such as the atmosphere and sea water, and seabed bioluminescence, to ensure that the receiving system has a high signal-to-noise ratio and at the same time transmit signals efficiently Light, so that the receiving system has a higher detection sensitivity, the filter is required to have the following properties: narrow bandwidth, high transmittance, large field of view and high out-of-band noise rej...
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Login to View More IPC IPC(8): H01S3/10G02B27/28
Inventor 郭弘张建玮罗斌党安红尹龙飞
Owner PEKING UNIV