Shi Fan, Yao Han, Huang Yiping, Li Wenlin, Wang Teng, Zeng Xianglong
Appl Opt. 2020 Feb 1;59(4):1206-1211. doi: 10.1364/AO.382496.
We present two kinds of mode-selective-coupler-based ultrafast radially polarized lasers delivering switchable wavelengths and pulsewidths. One is a linear-cavity fiber laser mode locked in the 1.5 µm region, which produces not only wavelength-agile radially polarized pulses in the spatial domain, but also switchable femtosecond and picosecond pulses in the temporal domain. The other one is a nonlinear-polarization-rotation-technique-assisted passively mode-locked fiber ring laser in the 1.0 µm region, presenting an ideal broadband spectral switching with picosecond radially polarized pulses output. The presented fiber lasers offer a type of compact laser source, enabling a flexible option for radially polarized beams in spectral and temporal domains.
我们展示了两种基于模式选择耦合器的超快径向偏振激光器，它们能够提供可切换的波长和脉冲宽度。一种是锁模在1.5微米区域的线性腔光纤激光器，它不仅在空间域产生波长灵活的径向偏振脉冲，还能在时间域产生可切换的飞秒和皮秒脉冲。另一种是在1.0微米区域采用非线性偏振旋转技术辅助的被动锁模光纤环形激光器，输出皮秒径向偏振脉冲，呈现出理想的宽带光谱切换。所展示的光纤激光器提供了一种紧凑的激光源，为光谱和时间域中的径向偏振光束提供了灵活的选择。
