Jiaxin Gao

Jul 8, 2024 | opg.optica.org | Yajun Jiang |Li Shen |Jiaxin Gao |Yuhui Su

The inscription of a helical-sampled fiber Bragg grating (HSFBG) in a ring core fiber (RCF) using a low repetition rate femtosecond laser point-by-point technique is demonstrated. The reflection spectrum exhibits several peak groups attributed to the helical-sampled structure, with the wavelength interval between different groups determined by the helical pitch. Meanwhile, the number and spacing of the peaks within each group are dictated by the RCF.

Jul 3, 2024 | mdpi.com | Gang Zhou |Jiaxin Gao |Yao Xu |Yi Zhang

1. IntroductionSignificant carbon emissions resulting from human activities are a primary contributor to global climate change. The climate issue has led humanity off course from progressing towards sustainable development. The United Nations Framework Convention on Climate Change (UNFCCC), established in May 1992, required industrialized countries to maintain their annual greenhouse gas emissions at 1990 levels by the end of the 1990s [].