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Proceedings Paper

Novel coupling device of high peak power pulsed laser to multimode fiber
Author(s): Xing-hai Zhao; Yang Gao; Wen-yong Cheng; Yong-sheng Cheng; Wei Su
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Paper Abstract

A novel coupling method for injecting a high peak power laser into a multimode optical fiber through cone-channel condenser is introduced. The novel coupler is investigated by experiments and theories. The design minimizes the irradiance on the fiber input face and reduces its dependence on the system alignment. A simple lens and a special designed cone-channel condenser operate together to transform a laser beam with 5 mm diameter into a smaller one that fits on the 400 μm or 600 μm diameter fiber face. The method resolves the problem that laser induce damage to fiber input end faces. The design principle and method of cone-channel condenser are described by the light transmission theory. The prototype was fabricated without anti-reflection coatings on the end faces. The experimental results show that the transmission efficiency of cone-channel condenser is up to 90%. Though there was 1 mm gap between the cone-channel condenser and a fiber, the coupling efficiency of cone-channel condenser to fiber reach 73%. The maximum transmitted energy before front-face of cone-channel condenser breakdown is 84.5mJ. The transmission capacity of fiber increases by 2-3 times comparing with the traditional method. The interest in this new coupling method is related to the development of transmitting high peak powers through multimode fibers applied to laser-based firing systems for initiating explosives and driving flyer, et al.

Paper Details

Date Published: 16 April 2008
PDF: 8 pages
Proc. SPIE 6998, Solid State Lasers and Amplifiers III, 69980O (16 April 2008); doi: 10.1117/12.779521
Show Author Affiliations
Xing-hai Zhao, China Academy of Engineering Physics (China)
Yang Gao, China Academy of Engineering Physics (China)
Wen-yong Cheng, China Academy of Engineering Physics (China)
Yong-sheng Cheng, China Academy of Engineering Physics (China)
Wei Su, China Academy of Engineering Physics (China)

Published in SPIE Proceedings Vol. 6998:
Solid State Lasers and Amplifiers III
Jonathan A. Terry; Thomas Graf; Helena Jelínková, Editor(s)

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