时空定域的亚laser循环电子源
A spatially and temporally localized sub-laser-cycle electron source
摘要：
我们提出了一个实验和数值研究的电子发射从一个尖锐的钨针尖触发亚8飞秒低功率激光脉冲。该过程在激光电场中是非线性的，并且可以通过施加到尖端的DC电压来调谐非线性。该系统的数值模拟表明，电子发射发生在小于一个光学周期的激发激光脉冲，使一个8飞秒800 nm的激光脉冲是能够产生一个单一的电子脉冲小于1飞秒的持续时间。此外，我们发现，载波包络的相位依赖的发射过程是小于0.1%的8飞秒脉冲，但急剧增加，减少激光脉冲宽度。
英文摘要：
We present an experimental and numerical study of electron emission from a sharp tungsten tip triggered by sub-8 femtosecond low power laser pulses. This process is non-linear in the laser electric field, and the non-linearity can be tuned via the DC voltage applied to the tip. Numerical simulations of this system show that electron emission takes place within less than one optical period of the exciting laser pulse, so that an 8 fsec 800 nm laser pulse is capable of producing a single electron pulse of less than 1 fsec duration. Furthermore, we find that the carrier-envelope phase dependence of the emission process is smaller than 0.1% for an 8 fsec pulse but is steeply increasing with decreasing laser pulse duration.
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