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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。
A simple method of exciting second harmonic oscillation (SHG) in optical fibers is reported: a Bragg grating is engraved on the erbium-doped and ytterbium-codoped fibers by UV pulsed laser. Thus breaking the intrinsic limitation that the second-order polarizability of quartz optical fiber is zero and forming a great permanent second-order polarizability. The periodic structure helps to achieve phase matching. In experiments, the fiber grating was pumped using a semiconductor laser (LD) at a wavelength of 980 nm. Significant blue-green radiation was observed at pumping powers of only a few milliwatts, and its intensity increased with increasing pump power increase. Under the microscope, the phenomenon of the optical fiber grating was observed and photographed. The blue-green radiation at the fiber core of the fiber grating was observed in the photo, while the non-grating region did not emit light and the ultraviolet radiation was observed at the same time.