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Chinese Science Bulletin, Volume 61, Issue 8: 799-801(2016) https://doi.org/10.1360/zk2016-61-8-799

对话舒跃龙: 科学认识流感大流行

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Abstract

通过数值求解两维含时薛定谔方程, 研究了在不同波长的椭圆极化激光驱动下氢原子发射高次谐波的特点, 得到了氢原子所产生的高次谐波谱截止位置处发射效率随椭偏率的依赖关系. 研究结果表明, 在激光光强保持不变的情况下, 激光波长越大, 截止位置处谐波发射效率对椭偏率的依赖越强; 而在相同的激光波长驱动下, 随着激光光强的增大, 氢原子高次谐波谱截止位置处的效率随着驱动场椭偏率的增大下降得更快. 最后, 利用不同波长下高次谐波发射效率随椭偏率的依赖关系, 通过数值计算和拟合研究了电子波包在隧穿电离后的横向扩散速率, 研究发现在谐波截止位置附近由ADK模型得到的横向扩散速率比数值求解两维含时薛定谔方程得到的结果约小17%, 正是这种横向扩散速率偏小的原因导致由ADK模型计算的谐波发射效率随椭偏率的增大相对于实验结果来说下降的较慢, 而数值求解两维模型原子得到的结果与实验结果一致.


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