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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。
The existing theory of femtosecond pulse measurement is based on the simplified pulse model, that is, only measure the time characteristics of the pulse, regardless of its spatial characteristics. In practice, the spatial and temporal characteristics of impulses are interdependent. Even in the space-time characteristics of femtosecond pulses propagating in free space, they interact with each other. In this paper, the time-space coupling pulse model in femtosecond laser pulse measurement theory is proposed. Taking into account the coupling between time and space, the femtosecond pulse model contains not only the time parameter but also the spatial parameter, that is, the expression of the pulsed electric field changes from E (t) to E (x, y, z, t) , Gives the iterative algorithm of pulse reconstruction under the time-space coupling model. This theory has important guiding significance for the measurement of femtosecond pulse.