利用具有时变焦速的双色飞焦脉冲实现太赫兹辐射的波前整形
Wavefront shaping of terahertz radiation using two-color flying-focus pulses with time-dependent focal velocities
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中文总结 AI 辅助
该研究提出利用时变焦速的双色飞焦脉冲，通过控制强度峰值与电离前沿的非均匀运动，实现THz辐射的波前整形，可产生适合收集聚焦的抛物面波前THz辐射。
中文摘要 AI 辅助
相位合适的双色激光脉冲驱动光电流，产生宽带太赫兹（THz）辐射。采用传统双色脉冲时，电离前沿以近似恒定的超光速传播，产生的THz辐射具有类切伦科夫角的锥形波前。本文表明，双色超短飞焦脉冲的动态强度峰值可用于控制THz波前的形状。模拟显示，强度峰值及其驱动的电离前沿的非均匀运动，产生时变发射角，该角度决定波前形状。特别是，减速的强度峰值可产生抛物面波前的THz辐射，这类辐射非常适合收集和聚焦。
英文摘要
Properly phased two-color laser pulses drive photoionization currents that emit broadband THz radiation. With a conventional two-color pulse, the ionization front travels at a nearly constant superluminal velocity, generating THz radiation with conical wavefronts at a Cherenkov-like angle. Here we show that the dynamic intensity peak of a two-color ultrashort flying-focus pulse can be used to control the shape of the THz wavefronts. Simulations demonstrate that non-uniform motion of the intensity peak and the ionization front it drives result in a time-dependent emission angle that determines the wavefront shape. A decelerating intensity peak, in particular, enables the generation of THz radiation with parabolic wavefronts that are well suited for collection and focusing.
