报道了基于锯齿波脉冲抑制自相位调制(SPM)的高功率窄线宽单频脉冲光纤激光放大器.通过优化掺镱(Yb)石英有源光纤的长度,在保证输出功率和转换效率的同时提高单频光纤激光放大器中的受激布里渊散射阈值,并采用脉冲波形为锯齿波的种子光...报道了基于锯齿波脉冲抑制自相位调制(SPM)的高功率窄线宽单频脉冲光纤激光放大器.通过优化掺镱(Yb)石英有源光纤的长度,在保证输出功率和转换效率的同时提高单频光纤激光放大器中的受激布里渊散射阈值,并采用脉冲波形为锯齿波的种子光,利用其光强对时间的变化率为常数的特性有效抑制了SPM效应导致的激光光谱展宽现象.主放大级泵浦功率为11.3 W时获得了平均输出功率为3.13 W、脉冲重复频率为20 k Hz的1064 nm单频激光输出;此时脉冲宽度为6.5 ns,对应峰值功率为24 k W,测得光谱线宽仅为83 MHz,接近变换极限水平.与采用常规高斯波形脉冲种子光的对照实验相比,锯齿波形脉冲对SPM所致的光谱展宽具有显著抑制效果,为高功率窄线宽脉冲光纤激光放大器提供了一种行之有效的方法.展开更多
Based on the index-induced mode coupling between the higher-order mode in core and the fundamental mode in cladding tubes,the single-mode operation can be realized in any antiresonant fibers(ARFs)when satisfying that ...Based on the index-induced mode coupling between the higher-order mode in core and the fundamental mode in cladding tubes,the single-mode operation can be realized in any antiresonant fibers(ARFs)when satisfying that the area ratio of cladding tube and core is about 0.46:1,and this area ratio also should be modified according to the shape and the number of cladding tubes.In the ARF with nodal core boundary,the mode in core also can couple with the mode in the wall of core boundary,which can further enhance the suppression of high-order mode.Accordingly,an ARF with conjoint semi-elliptical cladding tubes realizes a loss of higher-order mode larger than 30 dB/m;simultaneously,a loss of fundamental mode loss less than 0.4 dB/m.展开更多
文摘报道了基于锯齿波脉冲抑制自相位调制(SPM)的高功率窄线宽单频脉冲光纤激光放大器.通过优化掺镱(Yb)石英有源光纤的长度,在保证输出功率和转换效率的同时提高单频光纤激光放大器中的受激布里渊散射阈值,并采用脉冲波形为锯齿波的种子光,利用其光强对时间的变化率为常数的特性有效抑制了SPM效应导致的激光光谱展宽现象.主放大级泵浦功率为11.3 W时获得了平均输出功率为3.13 W、脉冲重复频率为20 k Hz的1064 nm单频激光输出;此时脉冲宽度为6.5 ns,对应峰值功率为24 k W,测得光谱线宽仅为83 MHz,接近变换极限水平.与采用常规高斯波形脉冲种子光的对照实验相比,锯齿波形脉冲对SPM所致的光谱展宽具有显著抑制效果,为高功率窄线宽脉冲光纤激光放大器提供了一种行之有效的方法.
基金Project supported by the National Natural Science Foundation of China(Grant No.62075159)the National Key Research and Development Program of China(Grant No.2017YFF0104603)+1 种基金the 111 Project of China(Grant No.B17031)the Major Scientific and Technological Innovation Projects of Key Research and Development Plans in Shandong Province,CHina(Grant No.2019JZZY020206)。
文摘Based on the index-induced mode coupling between the higher-order mode in core and the fundamental mode in cladding tubes,the single-mode operation can be realized in any antiresonant fibers(ARFs)when satisfying that the area ratio of cladding tube and core is about 0.46:1,and this area ratio also should be modified according to the shape and the number of cladding tubes.In the ARF with nodal core boundary,the mode in core also can couple with the mode in the wall of core boundary,which can further enhance the suppression of high-order mode.Accordingly,an ARF with conjoint semi-elliptical cladding tubes realizes a loss of higher-order mode larger than 30 dB/m;simultaneously,a loss of fundamental mode loss less than 0.4 dB/m.
