title: Coupling light from a laser diode into a multimode fiber.
abstract: A parabolalike fiber end to couple the light from a high-power laser diode into a multimode fiber is presented. The formula for the coupling efficiency of such a system is given, and numerical evaluation shows that the theoretical coupling efficiency can be as high as 92% without an antireflection coating on the fiber's end face. This beam-shaping system can be fabricated easily and has a large alignment tolerance.
authors.affiliation: School of Technical Physics, Xidian University, Xian 710071, China. xdzeng@xidian.edu.cn
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Zeng
authors.forename: Yuying
authors.initials: Y
authors.lastname: An