Ideal Waveform to Generate the Maximum Possible Electron Recollision Energy for Any Given Oscillation Period
Ideal Waveform to Generate the Maximum Possible Electron Recollision Energy for Any Given Oscillation Period
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DOI：
10.1103/physrevlett.102.063003
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发表时间：
2009-02-13
影响因子：
8.6
通讯作者：
Marangos, J. P.
中科院分区：
文献类型：
--
作者：
Chipperfield, L. E.;Robinson, J. S.;Marangos, J. P.
我们提出了一个完美的波形，在强场相互作用中，在任何给定的振荡周期内产生最大可能的电子重聚能量，是纯正弦波的3倍以上。这种理想的波形具有带直流偏置的线性斜坡的形式。采用遗传算法寻找一个由更长的波长场组成的实际可实现的优化波形，以提供偏移量，以及更高的频率分量。发现第二种波形能够产生与完美波形一样高的电子回收能量，同时保留纯正弦波的高回收幅度。高谐波产生的计算证明了这种增强，通过将截止能量增加2.5倍，同时保持谐波产生，为阿秒科学提供了增强的工具。
We present the perfect waveform which, during a strong field interaction, generates the maximum possible electron recollision energy for any given oscillation period, over 3 times as high as that for a pure sinusoidal wave. This ideal waveform has the form of a linear ramp with a dc offset. A genetic algorithm was employed to find an optimized practically achievable waveform composed of a longer wavelength field, to provide the offset, in addition to higher frequency components. This second waveform is found to be capable of generating electron recollision energies as high as those for the perfect waveform while retaining the high recollision amplitudes of a pure sinusoidal wave. Calculations of high harmonic generation demonstrate this enhancement, by increasing the cutoff energy by a factor of 2.5 while maintaining the harmonic yield, providing an enhanced tool for attosecond science.