期刊
OPTICS AND LASERS IN ENGINEERING
卷 153, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.optlaseng.2022.107006
关键词
Doughnut beam array; Hollow Bessel-like beam; Mode-selective coupler; Optical tweezer; Multicore fiber
类别
资金
- Science and Technology Commission of Shanghai Municipality [20JC1415700]
- State Key Laboratory of Pulsed Power Laser Technol-ogy [SKL2020KF03]
- National Natural Science Foundation of China [91750108]
- 111 Project [D20031]
Two methods for generating doughnut beam arrays and hollow Bessel-like beams based on all-fiber structures are demonstrated using mode-selective couplers. The advantages of compactness, flexibility, and easy integration with free-space optical systems make these methods highly significant for applications in super-resolution microscopy, laser material processing, and optical trapping.
Two all-fiber structures for generating doughnut beam arrays and hollow Bessel-like beams are demonstrated experimentally based on mode-selective couplers at the visible band. The mode-selective couplers are acted as mode converters to produce doughnut beams, which have the properties of high mode conversion efficiency (94%), low insertion loss (<0.5 dB) and wide bandwidth (similar to 100 nm). A compact and efficient approach is presented through integrating a tapered multicore fiber with a mode-selective coupler, and a doughnut beam array with nearly equal power distribution is obtained based on the mechanism of coupled-power theory in the tapered multicore fiber. The hollow Bessel-like beams with different cylindrical vector modes and orbital angular momentum are achieved by fabricating a polymer microtip at the facet of the few-mode fiber output port of a mode-selective coupler. The self-healing characteristics of a Bessel-like beam are investigated in detail and the application in an optical tweezer system of a hollow Bessel-like beam exhibits a longer focal depth than that of a Gaussian beam. Both methods used for generating all-fiber-based doughnut beam arrays and hollow Bessel-like beams have the advantages of compactness, flexibility, and easy integration with free-space optical systems. Generated two kinds of beams show huge potentials for the application fields of super-resolution microscopy, laser material process and optical trapping and so on.
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