Ding Yitian, Xu Miaomiao, Zhao Yongguang, Yu Haohai, Zhang Huaijin, Wang Zhengping, Wang Jiyang
Opt Lett. 2014 Apr 15;39(8):2366-9. doi: 10.1364/OL.39.002366.
We demonstrated a continuous-wave (cw) and pulsed optical vortex with topological charges driven by heat generated during the lasing process without introducing the astigmatism effect and reducing lasing efficiency. During the lasing process, the topological charges were changeable by the thermal-induced lens and selected by the mode-matching between the pump and oscillating beams. With a graphene sample as the saturable absorber, a pulsed optical vortex was achieved at a wavelength of 1.36 μm, which identified that graphene could be used as a pulse modulator for the generation of a pulsed optical vortex. Thermally driven cw and pulsed optical vortexes should have various promising applications based on the compact structure, changeable topological charges, and specific wavelength.
我们展示了一种连续波（cw）和具有拓扑电荷的脉冲光学涡旋，其由激光过程中产生的热量驱动，而无需引入像散效应和降低激光效率。在激光过程中，拓扑电荷可通过热致透镜改变，并通过泵浦光束和振荡光束之间的模式匹配进行选择。以石墨烯样品作为可饱和吸收体，在1.36μm波长处实现了脉冲光学涡旋，这表明石墨烯可作为产生脉冲光学涡旋的脉冲调制器。基于紧凑的结构、可变的拓扑电荷和特定的波长，热驱动的连续波和脉冲光学涡旋应具有各种有前景的应用。
