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提出一种直接得到脉宽小于50 as的单个脉冲的新方法.利用波长为800 nm脉宽为5fs的超短脉冲叠加上波长为10μm,强度为超短脉冲强度的10%且脉宽足够长的低频场脉冲驱动氦原子,谐波谱可以拓展到Ip+8.2Up,同时,高于4.2Up的谐波几乎是连续的.如果继续调节超短脉冲的载波包络相位,超连续谱可以继续拓宽,从而可以得到低于50 as的单个脉冲.
A new method for directly obtaining a single pulse with a pulse width less than 50 asses is proposed.It uses an ultrashort pulse with a pulse width of 5fs at a wavelength of 800 nm and an ultrashort pulse with a wavelength of 10 μm and an intensity of 10% of the ultrashort pulse with a sufficiently long pulse width , The harmonic spectrum can be expanded to Ip + 8.2Up, meanwhile the harmonics above 4.2Up are almost continuous. If the carrier envelope phase of the ultrashort pulse continues to be adjusted, the supercontinuum can continue Broaden so you get a single pulse below 50 as.