Continuous attenuator capable of keeping original polarization state
A polarization state and attenuator technology, applied in the field of optical detection, can solve the problems of not having a wide spectrum, communication laser distortion, etc.
Inactive Publication Date: 2014-01-29
CHANGCHUN UNIV OF SCI & TECH
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Problems solved by technology
[0004] The problem in the existing technology is that the polarization state of the measured polarized light changes before entering the prism 4 and after exiting the prism 4. If this scheme is used to simulate a laser that transmits a certain communication distance, the communication laser will actually be distorted.
In addition, the prior art needs to adjust the film thickness of the reflective film 5 to adapt to the attenuation of light of different wavelengths. Therefore, the prior art does not have the characteristics of wide spectrum
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[0010] The continuous attenuator capable of maintaining the original polarization state of the present invention includes a prism capable of internal reflection. Described prism comprises horizontal rhombic prism 11 and vertical rhomboid prism 12, as figure 2 Shown, horizontal rhombic prism 11 and vertical rhombic prism 12 are two identical rhomboidal prisms, the axis passes through the geometric center of the side of the prism and is perpendicular to the side of the prism, the axis of horizontal rhomboid prism 11 is the same as the axis of vertical rhombic prism 12 In a spatially vertical relationship, the outgoing surface of the horizontal rhomboidal prism 11 is opposite to the incident surface of the vertical rhomboidal prism 12 . The incident surface and the outgoing surface of the horizontal rhomboid prism 11 and the vertical rhomboid prism 12 are coated with an anti-reflection film of 380-1560 nm. The material of the horizontal rhombic prism 11 and the vertical rhomboi...
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The invention discloses a continuous attenuator capable of keeping an original polarization state, and belongs to the technical field of optical detecting. In the prior art, polarization state is changed after attenuation of tested polarized light. A horizontal inclined square prism and a vertical inclined square prism which are two same inclined square prisms are adopted, axes penetrate the geometric centers of the side faces of the prisms and are perpendicular to the sides of the prisms, a spatial vertical relation is formed between the axes of the two inclined square prisms, and the emergent plane of the horizontal inclined square prism is opposite to the incident plane of the vertical inclined square prism. A horizontal rotary table and a vertical rotary table support the horizontal inclined square prism and the vertical inclined square prism respectively, are synchronously driven by a horizontal motor and a vertical motor in the same direction respectively, and are provided with horizontal circular gratings and vertical circular gratings respectively. Angle signal transmission relations are formed between the horizontal circular gratings and a signal collecting and processing system as well as between the vertical circular gratings and the signal collecting and processing system. The signal collecting and processing system is connected with an attenuation coefficient control system. Drive control signal transmission relations are formed between the attenuation coefficient control system and the horizontal motor as well as between the vertical motor and the horizontal motor.
Description
technical field [0001] The invention relates to a continuous attenuator capable of maintaining the original polarization state, belonging to the technical field of optical detection. Background technique [0002] Some optical inspection projects require attenuation of the intensity of the inspected beam, such as laser communication inspection. In order to realize off-site inspection, it is necessary to simulate a laser that has transmitted a certain communication distance, which requires energy attenuation of the laser. [0003] In the prior art, there is a "variable optical attenuator based on internal reflection effect", see Chinese "Acta Optics" Vol. 23 No. 7. The program consists of a laser 1, a reflector 2, a polarizer 3, a prism 4, a reflective film 5, a detector 6, an A / D converter 7, a goniometer 8, a stepping motor 9, and a computer 10, such as figure 1 shown. The laser light of a certain wavelength such as 832nm emitted by the laser 1 is reflected by the reflecto...
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IPC IPC(8): G02B17/08G02B7/18
Inventor贺文俊付跃刚王加科欧阳名钊
OwnerCHANGCHUN UNIV OF SCI & TECH