The method to pump the FBG written into an Er3+-doped optical fiber is proposed to increase the group velocity of a prob......

为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7......

For a V-type three-level atomic system with two closely spaced upper levels, we investigate the light pulse propagation ......