Self-induced transparency, compression, and stopping of electromagnetic pulses interacting with beams of unexcited classical oscillators
Self-induced transparency, compression, and stopping of electromagnetic pulses interacting with beams of unexcited classical oscillators
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电磁脉冲与未受激经典振荡器光束相互作用的自感透明、压缩和停止
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
A. Sergeev
中科院分区：
文献类型：
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作者：
N. Ginzburg;I. Zotova;A. Sergeev
当短脉冲（在弛豫时间尺度上）在二能级非反转介质中传播时出现的自诱导透明效应在光学中是众所周知的。微波脉冲与初始直线电子束在回旋共振条件下的相互作用可以作为所述效应的经典模拟。在这种情况下，在输入信号的一定强度下，当输入脉冲几乎不改变其轮廓地传播时，回旋吸收被自诱导透明所取代，形成其幅度和持续时间与其速度刚性相关的孤子。在一定的参数域，这个过程是伴随着显着的两个或三倍压缩的初始脉冲，这是实际利益的产生多千兆瓦皮秒微波脉冲。由于孤子速度介于辐射的未扰动群速度和粒子的平移速度之间，因此在与反向传播的电子束相互作用的情况下，另一个重要的效应是电磁脉冲可能会显著减速或完全停止。
The self-induced transparency effects that emerge when short (on the relaxation time scale) light pulses propagate in a two-level noninverted medium are well known in optics. The interaction of microwave pulses with an initially rectilinear electron beam under cyclotron resonance conditions can serve as a classical analog of the described effects. In this case, at a certain intensity of the input signal, the cyclotron absorption is replaced by self-induced transparency when the input pulse propagates almost without any change of its profile, forming a soliton whose amplitude and duration are rigidly related to its velocity. In a certain domain of parameters, this process is accompanied by significant two- or threefold compression of the initial pulse, which is of practical interest for the generation of multigigawatt picosecond microwave pulses. Since the soliton velocity lies between the unperturbed group velocity of the radiation and the translational velocity of the particles, another nontrivial effect in the case of interaction with a counterpropagating electron beam is the possibility of a significant deceleration or full stopping of the electromagnetic pulse.