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- W4313478224 abstract "An ultrabroadband long-period fiber grating with 10-dB bandwidth of 155 nm and 3-dB bandwidth of 415 nm is demonstrated around an optical wavelength of 1060 nm in a few-mode fiber. Combined with a wavelength-tunable ytterbium-doped fiber laser, the application of the force-gradient method achieves the generation of optical doughnuts in the spectral range of 1030 nm <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$sim ~1099$ </tex-math></inline-formula> nm. This long-period fiber grating has also been used with an amplified-spontaneous-emission source to obtain a broadband optical doughnut. Instead of varying the grating period, the ultrabroad bandwidth is obtained by adjusting the effective index difference between the core mode and the higher-order modes, which is realized by the variation of an applied force in the few-mode fiber, and the force gradient along the grating is quantitatively determined to be 2.11 N/cm." @default.
- W4313478224 created "2023-01-06" @default.
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- W4313478224 date "2023-02-15" @default.
- W4313478224 modified "2023-10-16" @default.
- W4313478224 title "Ultrabroadband Long-Period Fiber Gratings for Wavelength-Tunable Doughnut Beam Generation" @default.
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- W4313478224 doi "https://doi.org/10.1109/lpt.2022.3233534" @default.
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