Doughnut-like beam generation of Laguerre-Gaussian mode with extremely high mode purity |
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Authors: | Shu-Chun Chu Kenju Otsuka |
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Institution: | a Department of Physics, National Cheng Kung University, No. 1, University Road, Tainan City 701, Taiwan b Department of Human and Information Science, Tokai University, 1117 Kitakaname, Hiratsuka, Kanagawa 259-1292, Japan |
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Abstract: | An apparatus to achieve a single doughnut-like Laguerre-Gaussian (LG) mode with extremely high mode purity higher than 99.6% is reported. The proposed apparatus is a conceptual combination of a high-order HG mode selector and an astigmatic mode converter, which consists of only four simple and easily-made optical elements: three lens elements and one binary phase element. Theoretical simulations show that the apparatus has a good tolerance for both system production and alignment errors. With such high mode purity, the doughnut-like LG beam generated by the apparatus carrying an orbital angular momentum will be beneficial to numbers of studies including the trapping and rotating of micro and nano-particles, non-linear optics, and atom-light interaction. |
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Keywords: | 42 60 &minus v 42 60 By 42 60 Da |
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