Multimode Fiber Exit Spot Focusing Method and System Based on Adaptive Parallel Coordinate Algorithm
A technology of multi-mode fiber and focusing method, applied in optics, optical components, testing optical performance, etc., can solve the problem that multi-mode fiber output end cannot quickly and effectively form batch focused spots, etc., and achieves fast modulation speed and good optical path stability. , the effect of a small amount of calculation
Active Publication Date: 2021-02-19
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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[0005] In order to solve the technical problem that the existing multimode fiber exit spot focusing method cannot quickly and effectively form a batch of focused spot at the multimode fiber exit end, the present invention provides a fast focusing method for multimode fiber exit spot based on an adaptive parallel coordinate algorithm method and system
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[0051] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0052] Such as figure 1 As shown, the system for fast focusing of multimode fiber exit spots based on adaptive parallel coordinate algorithm provided in this embodiment includes laser 1, first lens 2, second lens 3, spatial light modulator 4, First convex lens 5, aperture stop 6, second convex lens 7 and focusing objective lens 8; The rear end of focusing objective lens 8 is connected imaging objective lens 10 by multimode optical fiber 9; CCD camera 11 is arranged on the outgoing optical path of imaging objective lens 10; CCD The camera 11 is connected to a computer 12 .
[0053] The first lens 2 and the second lens 3 constitute a collimating beam expanding module, which is used to collimate and expand the beam emitted by the laser 1 before entering the spatial light modulator 4 .
[0054] The pinhole stop 6 is arranged on the focal plane of the firs...
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The invention provides a multimode fiber exiting spot focusing method and system based on the adaptive parallel coordinate algorithm and aims to solve a problem that a multimode fiber exiting spot focusing method cannot quickly form batches of focusing spots on a multimode fiber exiting end in the prior art. The method comprises steps of online speckle acquisition and offline phase optimization, during online speckle acquisition, for each modulation sub region of a spatial light modulator in the gating state, non-interference speckle images of the multimode fiber exiting end and interference speckle images of the modulation sub region and a reference sub region which are in the gating state are respectively acquired, and all the M modulation sub regions are traversed and scanned to obtain3 (M-1) +1 speckle images; during offline phase optimization, for preset N focusing spots, the intensity information of the corresponding focusing position on the 3 (M-1)+1 scatter images is utilizedto sequentially calculate a phase modulation state of each test mode corresponding to all the focusing spots, phase modulation masks are formed and are loaded one by one on the spatial light modulator, and point-by-point focusing of the N exiting spots of the multimode fiber is achieved.
Description
technical field [0001] The invention belongs to the technical field of novel optical imaging and light field regulation, and in particular relates to a method and system for fast focusing of multimode optical fiber exit spot based on an adaptive parallel coordinate algorithm. Background technique [0002] Multimode fiber has multiple guided wave modes, which can carry out information transmission in parallel and realize intra-area imaging. In recent years, multimode fiber imaging methods have become a research hotspot. However, when the incident light of the multimode fiber propagates in different guided wave modes, the mode dispersion and inter-mode coupling lead to the energy exchange between the modes, disrupting the time and space information of the incident light field, and generating signal crosstalk, so that the output of the multimode fiber is A series of speckle hinders the application of multimode fiber in digital signal and image signal transmission. [0003] At...
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IPC IPC(8): G02B27/40G02B27/48G01M11/02
Inventor 任立勇耿燚陈慧贺正权
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI