We demonstrate visible-light all-fiber vortex lasers by incorporating the home-made mode selective couplers (MSCs). The MSC at green or red wavebands is fabricated by specially designing and fusing a single-mode fiber (SMF) and a few-mode fiber (FMF). The MSCs inserted into visible fiber cavities act as power splitters and mode converters from the LP 01 to LP 11 mode at green and red wavelengths, respectively. The red-light all-fiber vortex laser is formed by a 10-cm Pr 3+ /Yb 3+ :ZBLAN fiber, a fiber Bragg grating, a fiber end-facet mirror and the MSC at 635 nm, which generates vortex beams with OAM ±1 at 634.4 nm and an output power of 13 mW. The green-light all-fiber vortex laser consists of a 12-cm Ho 3+ :ZBLAN fiber, two fiber pigtail mirrors, and the MSC at 550 nm, which generates vortex beams with OAM ±1 at 548.9 nm and an output power of 3 mW.

中文翻译：

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基于模式选择耦合器的可见光全光纤涡旋激光器

通过结合自制的模式选择性耦合器（MSC），我们演示了可见光全光纤涡旋激光器。通过专门设计和融合单模光纤（SMF）和几模光纤（FMF）来制造绿色或红色波段的MSC。插入可见光纤腔中的MSC分别用作在绿色和红色波长处从LP 01到LP 11模式的功率分配器和模式转换器。红光全光纤涡旋激光器是由10 cm Pr 3+ / Yb 3+：ZBLAN光纤，布拉格光纤光栅，光纤端面镜和635 nm的MSC形成的，它产生具有OAM在634.4 nm处为±1，输出功率为13 mW。绿光全光纤涡旋激光器由12厘米厚的Ho 3+：ZBLAN光纤，两个光纤尾纤反射镜和550 nm的MSC组成，其在548处产生OAM±1的涡旋光束。