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optical scanning endoscope via a single multimode optical fiber

Opto-Electronic Science 2024年第3期3卷 1-32页

作者： Guangxing Wu Runze Zhu Yanqing Lu Minghui Hong Fei Xu Department of Electrical and Computer Engineering National University of Singapore4 Engineering Drive 3117576Singapore College of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210023China Pen-Tung Sah Institute of Micro-Nano Science and Technology Xiamen University33 Qunxian RoadXiamen 361005China

optical endoscopy has become an essential diagnostic and therapeutic approach in modern biomedicine for directly observing organs and tissues deep inside the human body,enabling non-invasive,rapid diagnosis and *** fiber endoscopy is highly competitive among various endoscopic imaging techniques due to its high flexibility,compact structure,excellent resolution,and resistance to electromagnetic *** the past decade,endoscopes based on a single multimode optical fiber(MMF)have attracted widespread research interest due to their potential to significantly reduce the footprint of optical fiber endoscopes and enhance imaging *** comparison with other imaging principles of MMF endoscopes,the scanning imaging method based on the wavefront shaping technique is highly developed and provides benefits including excellent imaging contrast,broad applicability to complex imaging scenarios,and good compatibility with various well-established scanning imaging *** this review,various technical routes to achieve light focusing through MMF and procedures to conduct the scanning imaging of MMF endoscopes are *** advancements in imaging performance enhancements,integrations of various imaging modalities with MMF scanning endoscopes,and applications are *** specific to this endoscopic imaging technology are analyzed,and potential remedies and avenues for future developments are discussed.

关键词： multimode optical fiber endoscope scanning imaging focusing wavefront shaping

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multimode optical fiber Displacement Sensor

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Semiconductor Photonics and Technology 2000年第3期6卷 148-150页

作者： SHANG Li-ping ZHENG De-zhong YU Si-yuan SHI Jin-shan Yanshan University Qinhuangdao 066004CHN

The structure of an intensity modulation optical fiber sensor is introduced. The principle of the sensor which can detect minor displacement by use of minor curve in dark ground is described. Complex experiment shows that the multimode optical fiber not only has the abilitly of detecting the displacement of less than 0.1 nm, but also exhibits characteristics of wide dynamic range and good linearety.

关键词： multimode optical fiber Intensity modulation Mode coupling

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fiber Optic Coupling of CW Linear Laser Diode Array

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Chinese Journal of Lasers 2002年第3期11卷 46-48页

作者： WANG Xiaowei XIAO Jianwei MA Xiaoyu WANG Zhongming FANG Gaozhan (National Research Center for Optoelectronic Engineering, Institute of Semiconductors, The Chinese Academy of Science, Beijing 100083, China) Institute of Semiconductors，The Chinese Academy of Science国家光电子工艺中心北京 100083 Institute of Semiconductors The Chinese Academy of Science国家光电子工艺中心北京 100083

Based on a set of microoptics the output radiation from a continuous wave (CW) linear laser diode array is coupled into a multi mode optical fiber of 400 μm diameter. The CW linear laser diode array is a 1 cm laser diode bar with 19 stripes with 100 μm aperture spaced on 500 μm centers. The coupling system contains packaged laser diode bar, fast axis collimator, slow axis collimation array, beam transformation system and focusing system. The high brightness, high power density and single fiber output of a laser diode bar is achieved. The coupling efficiency is 65% and the power density is up to 1.03×10 4 W/cm 2.

关键词： fiber coupling laser diode bar multimode optical fiber

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Shaping the light amplified in a multimode fiber

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Light(Science & Applications) 2016年第1期5卷 250-258页

作者： Raphael Florentin Vincent Kermene Joel Benoist Agnès Desfarges-Berthelemot Dominique Pagnoux Alain Barthélémy Jean-Pierre Huignard XLIM Research Institute Universitéde Limoges-Centre National de la Recherche ScientifiqueUMR 625287060 LimogesFrance Institut Langevin ESPCI-ParisTech75238 ParisFrance

Propagation of light in multimode optical fibers usually gives a spatial and temporal randomization of the transmitted field similar to the propagation through scattering *** still applies when scattering or multimode propagation occurs in gain *** demonstrate that appropriate structuration of the input beam wavefront can shape the light amplified by a rareearth-doped multimode *** of the wavefront was achieved by a deformable mirror in combination with an iterative optimization *** present experimental results and simulations showing the shaping of a single sharp spot at different places in the output cross-section of an ytterbium-doped fiber *** and narrowing of the amplifier far-field pattern was realized as *** the wavefront to shape the amplified light can also serve to improve the effective *** shaping approach still works under gain saturation,showing the robustness of the *** and experiments attest that the shaping is effective even with a highly multimode fiber amplifier carrying up to 127 modes.

关键词： adaptive optics amplification beam shaping complex media multimode optical fiber

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