【作者】 刘文军； 曲士良； 李华军； 周常河；

【Author】 LIU Wen-jun1,QU Shi-liang1,LI Hua-jun1,ZHOU Chang-he2(1.Department of Optics and Electronics Sciences,Harbin Institute of Technology at Weihai,Weihai 264209,China;2.Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China)

【机构】 哈尔滨工业大学光电科学系(威海)； 中国科学院上海光学精密机械研究所；

【摘要】 现有的飞秒脉冲测量理论是建立在简化的脉冲模型基础上,即只对脉冲的时间特性进行测量,不考虑其空间特性。在实际中脉冲的空间特性和时间特性是相互依赖的,即使在自由空间传播的飞秒脉冲它的时间和空间特性之间也发生着相互的耦合作用。文中提出了飞秒激光脉冲测量理论中的时间-空间耦合脉冲模型。考虑到时间和空间之间的耦合作用,飞秒脉冲模型除了包含时间参量之外,还包含空间参量,即脉冲电场的表达式由E(t)变为E(x,y,z,t),给出了时间-空间耦合模型下的脉冲再现迭代算法。这一理论对飞秒脉冲的测量有重要的指导意义。更多还原

【Abstract】 The theory of measuring femtosecond pulse which is widely used at present is based on the simplified pulse model.The simplified pulse model only considers the temporal characteristic of pulse,and the spatial characteristic is disregarded.In reality,the temporal and spatial characteristics are dependent on each other.Even femtosecond pulse propagates in free space,there is coupling effect between its temporal and spatial domain.Furthermore,femtosecond pulse experiences dispersion unavoidably when it passes though optical elements because of its ultra-wide spectrum,and coupling effect between the spatial and temporal domain must have been introduced by dispersion.A new pulse model which is based on the spatial and temporal coupling effect is proposed.The new pulse model not only considers the temporal characteristic but also includes the spatial characteristic,namely,the electric field is become E(x,y,z,t) from E(t).The trace obtained under new pulse model is different from that obtained under simplified pulse model.The iterative algorithm is also presented.This theory is beneficial to the measurement of femtosecond pulse.更多还原