【摘要】 报道了一种在光纤中激发二次谐波振荡(SHG)的简单方法:利用紫外脉冲激光在载氢后的高浓度铒、镱共 掺的光纤上刻制布拉格光栅。从而打破了石英光纤二阶极化率为零的固有限制,形成了极大的永久的二阶极化 率,周期性的结构辅助实现了相位的匹配。在实验中,利用波长为980nm的半导体激光器(LD)抽运该光纤光栅, 在只有几毫瓦的抽运功率下,便观察到了显著的蓝绿光辐射,而且强度随抽运功率的增加而增加。在显微镜下对 光纤光栅发光现象进行了观测并拍摄了数码相片,在相片中观测到光纤光栅纤芯处的蓝绿光辐射,而非光栅区没 有发光现象,同时观测到了紫外光辐射。更多还原

【Abstract】 A novel method of second harmonic generation (SHG) is reported. A permanent second order nonliearity which is zero in theory has been induced simultaneously by ultraviolet (UV)-excited poling in a high concentration Er-Yb co-doped fiber Bragg gratings, and the phase-match has been satisfied with periodic structure. When a 980-nm laser diode (LD) pumped the fiber gratings, SHGs in such a fiber gratings with low pump power (<4 mW) were abserved and the intensity increased with the increase of pump power. The SHG light radiating phenomenon was observed under microscope and some microscope photograph were taken. It was found that the radiation occurred only in the core of the fiber gratings. And then UV radiation from the structure was also recorded.更多还原