Coherent beam transformations using multimode waveguides

被引：45
作者：
Zhu, X. [1 ]
Schuelzgen, A. [1 ]
Li, H. [1 ]
Wei, H. [1 ]
Moloney, J. V. [1 ]
Peyghambarian, N. [1 ]
机构：
[1] Univ Arizona, Coll Opt Sci, Tucson, AZ 85721 USA
来源：
OPTICS EXPRESS | 2010年 / 18卷 / 07期
基金：
美国国家科学基金会;
关键词：
FIBER LASERS; INTERFERENCE; HOMOGENIZER; AMPLIFIERS;
D O I：
10.1364/OE.18.007506
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Physical insights and characteristics of beam transformations based on multimode interference (MMI) in multimode waveguides are illuminated and analyzed. Our calculations show that, utilizing a short piece of cylindrical multimode waveguide, an input Gaussian beam can be readily transformed to frequently desired beams including top-hat, donut-shaped, taper-shaped, and Bessel-like beams in the Fresnel or the Fraunhofer diffraction range, or even in both ranges. This is a consequence of diffractive propagation of the field exiting the waveguide. The performance of the beam shaper based on MMI can be controlled via tailoring the dimensions of the multimode waveguide or changing the signal wavelength. This beam shaping technique is investigated experimentally using monolithic fiber devices consisting of a short piece of multimode fiber (similar to 10 mm long) and a single-mode signal delivery fiber. (C) 2010 Optical Society of America
引用
收藏
页码：7506 / 7520
页数：15
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