期刊
JOURNAL OF LIGHTWAVE TECHNOLOGY
卷 39, 期 6, 页码 1867-1872出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2020.3042602
关键词
Laser beams; Optical fiber sensors; Optical fibers; Optical fiber communication; Fiber gratings; Optical vortices; Measurement by laser beam; Fiber sensor; fractional orbital angular momentum; long period fiber grating
资金
- National Natural Science Foundation of China (NSFC) [62005169, 61875134, 61635007]
- Natural Science Foundation of Guangdong Province [2019A050510047, 2019B1515120042]
- Science and Technology Innovation Commission of Shenzhen [JCYJ20180507182058432, JCYJ20180507182035270, JCYJ20180305125352956, JCYJ20170818143853289]
This study introduces a novel method for detecting the fractional topological charge of optical orbital angular momentum states, highlighting the potential applications in fields such as optical communication and quantum information. Experimental results show that the proposed method offers a concise, precise, continuous, and fiber-compatible fractional TC detection approach.
Optical orbital angular momentum (OAM), carried by optical vortices, is a fundamental property of light that grabs broad interests. The detection of OAM modes, including fractional OAM is of great importance in diverse fields. Here, we firstly propose and develop the limited integer-component measurement method to determine the fractional topological charge (TC) of OAM states. This method indicates that a 2-integer-mode responsive device could be applied for the detection of fractional TC. An orthogonal long-period fiber grating (OLPFG) element is used as a fractional OAM TC probe to verify the Applicability. We experimentally demonstrate the fractional TC detection, ranging from -1 to 0, and recognize different fractional OAM modes with the minimum TC interval of 0.01. This scheme provides a concise, precise, continuous, and fiber-compatible fractional TC detection method that might have great potential in micro-detection, optical communication, quantum information, and chiral sensing applications.
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