AI 中文总结
研究通过单片干涉仪测量布洛赫轨迹谐波偶极相位，提出用于薄膜固体高谐波干涉测量的方法，揭示多晶ZnO中高次谐波产生的偶极相位，表明布洛赫振荡促成的重碰撞是带隙上方高次谐波产生的主要贡献。
AI 中文摘要
揭示气相高次谐波产生的偶极相位有助于理解阿秒脉冲产生背后的重碰撞物理。凝聚相中的相应测量尚未得出一致结果。本文提出一种用于薄膜固体高谐波干涉测量的紧凑且本质稳定的方法。利用该方法揭示了由宽带中红外激光脉冲驱动的多晶ZnO中高次谐波产生的偶极相位。实验表明，在实验条件下，由布洛赫振荡促成的重碰撞是带隙上方高次谐波产生的主要贡献。
英文摘要
Uncovering the dipole phase of gas-phase high harmonic generation was instrumental to understanding the recollision physics underlying attosecond pulse generation. Corresponding measurements in the condensed phase have not yet yielded a consistent picture. Here, we present a compact and inherently stable approach to high-harmonic interferometry in thin-film solids. We employ it to reveal the dipole phase of high-harmonic generation in polycrystalline ZnO, driven by broadband mid-IR laser pulses. We demonstrate that, under the conditions of our experiments, recollisions facilitated by Bloch oscillations represent the dominant contribution to high-harmonic generation just above the bandgap.
Comments7 pages, 5 figures
