论文标题
两色高谐波生成中各个峰的抑制
Suppression of individual peaks in two-colour high harmonic generation
论文作者
论文摘要
这项工作研究了对单个谐波的抑制，同时影响了由霓虹灯中量身定制的两彩，多周期激光脉冲产生的高谐波光谱中的特定均匀顺序和奇数。最终的光谱是系统地研究的，这是对称性破裂（$ω$ - $2Ω$）和对称保留（$ω$-3Ω$）配置的电场形状的函数。峰抑制是通过宏观强场近似计算复制的，并且发现对对称性破裂的字段独有（$ω$-2Ω$）。此外，半古典计算进一步证实了观察结果并揭示其潜在机制，在此过程中，发现随后的不对称半伴侣之间的非平凡光谱干扰是造成抑制作用的原因。
This work investigates the suppression of individual harmonics, simultaneously affecting specific even and odd orders in the high-harmonic spectra generated by strongly tailored, two-colour, multi-cycle laser pulses in neon. The resulting spectra are systematically studied as a function of the electric-field shape in a symmetry-broken ($ω$-$2ω$) and symmetry-preserved ($ω$-$3ω$) configuration. The peak suppression is reproduced by macroscopic strong-field approximation calculations and is found to be unique to symmetry-broken fields ($ω$-$2ω$). Additionally, semi-classical calculations further corroborate the observation and reveal their underlying mechanism, where a nontrivial spectral interference between subsequent asymmetric half-cycles is found to be responsible for the suppression.
