Fu Cailing, Li Pengfei, Bai Zhiyong, Liu Shen, Wang Yiping
Opt Lett. 2020 Sep 15;45(18):5032-5035. doi: 10.1364/OL.399390.
A compact and broad wavelength range tunable orbital angular momentum (OAM) generator was experimentally demonstrated by cascading two helical photonic crystal fibers (HPCFs) with opposite helicity, i.e., clockwise-twisted + anticlockwise-twisted HPCF. Such an OAM generator exhibited a length of approximately 9 mm and generated a high-quality OAM mode with a wavelength range of 35 nm. Moreover, the wavelength range is expected to be tuned from 17.9-51.3 nm by applying mechanical torsion.
通过级联两根具有相反螺旋度的螺旋光子晶体光纤（HPCF），即顺时针扭曲的HPCF和逆时针扭曲的HPCF，实验展示了一种紧凑且宽波长范围可调的轨道角动量（OAM）发生器。这种OAM发生器长度约为9毫米，能产生波长范围为35纳米的高质量OAM模式。此外，通过施加机械扭转，波长范围有望在17.9 - 51.3纳米之间进行调谐。
