Tosa Valer, Kovacs Katalin, Altucci Carlo, Velotta Raffaele
National Institute for Research and Development of Isotopic and Molecular Technologies, Donath str. 65-103, 400293 Cluj-Napoca, Romania.
Opt Express. 2009 Sep 28;17(20):17700-10. doi: 10.1364/OE.17.017700.
We analyze the macroscopic effects which are responsible for producing clean isolated pulses lasting few hundreds of attoseconds when starting from multi-cycle fundamental pulses. In particular, we consider a polarization gating scheme and show that, at high fundamental peak intensities, in the range 0.7-1 PWcm(-2), it usually produces three-four main attosecond pulses of radiation at single dipole level, just located in the leading edge of the laser pulse. We describe the physical mechanisms contributing to the formation of a single attosecond pulse by using a three dimensional non-adiabatic model and a quantum trajectory phase calculation. An analysis of the scheme optimization and stability against various parameters is performed in view of an experimental scheme implementation.
我们分析了从多周期基频脉冲开始产生持续数百阿秒的干净孤立脉冲的宏观效应。特别地，我们考虑一种偏振选通方案，并表明，在0.7 - 1 PWcm⁻²范围内的高基频峰值强度下，它通常在单偶极子能级产生三到四个主要的阿秒辐射脉冲，恰好位于激光脉冲的前沿。我们通过使用三维非绝热模型和量子轨迹相位计算来描述促成单个阿秒脉冲形成的物理机制。鉴于实验方案的实施，对该方案针对各种参数的优化和稳定性进行了分析。
