fs脉冲在自由空间中的无畸变紧约束和阶跃衰减
Distortion-free tight confinement and step-like decay of fs pulses in free space
摘要：
本文介绍了一种在自由空间有限长传输条件下，产生强度阶跃衰减的紧束缚无畸变飞秒脉冲的方法。这种脉冲是由高折射率波导的菲涅耳源形成的。源在自由空间中再现由波导限制的传播不变（无失真）脉冲。与物质波导的情况相反，当脉冲从菲涅耳（虚拟）波导中射出时，其形状没有改变，但强度立即下降到近零水平。
英文摘要：
A method of formation of the tightly confined distortion-free fs pulses with the step-like decreasing of intensity under the finite-length propagation in free space is described. Such pulses are formed by the Fresnel source of a high refraction-index waveguide. The source reproduces in free space a propagation-invariant (distortion-free) pulse confined by the waveguide. Converse to the case of material waveguides, when the pulse goes out from the Fresnel (virtual) waveguide its shape is not changed, but the intensity immediately drops down to the near-zero level.
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