Bierbach Jana, Yeung Mark, Eckner Erich, Roedel Christian, Kuschel Stephan, Zepf Matt, Paulus Gerhard G
Opt Express. 2015 May 4;23(9):12321-7. doi: 10.1364/OE.23.012321.
Surface high-harmonic generation in the relativistic regime is demonstrated as a source of extreme ultra-violet (XUV) pulses with extended operation time. Relativistic high-harmonic generation is driven by a frequency-doubled high-power Ti:Sapphire laser focused to a peak intensity of 3·10(19) W/cm2 onto spooling tapes. We demonstrate continuous operation over up to one hour runtime at a repetition rate of 1 Hz. Harmonic spectra ranging from 20 eV to 70 eV (62 nm to 18 nm) were consecutively recorded by an XUV spectrometer. An average XUV pulse energy in the µJ range is measured. With the presented setup, relativistic surface high-harmonic generation becomes a powerful source of coherent XUV pulses that might enable applications in, e.g. attosecond laser physics and the seeding of free-electron lasers, when the laser issues causing 80-% pulse energy fluctuations are overcome.
相对论 regime 下的表面高次谐波产生被证明是一种产生具有延长工作时间的极紫外（XUV）脉冲的源。相对论高次谐波产生由倍频高功率钛宝石激光器驱动，该激光器聚焦到峰值强度为 3·10(19) W/cm2 照射到卷轴带上。我们展示了在 1 Hz 的重复频率下长达一小时的连续运行。通过 XUV 光谱仪连续记录了范围从 20 eV 到 70 eV（62 nm 到 18 nm）的谐波光谱。测量到的平均 XUV 脉冲能量在微焦耳范围内。利用所展示的装置，当克服导致 80%脉冲能量波动的激光问题时，相对论表面高次谐波产生成为一种强大的相干 XUV 脉冲源，这可能使例如阿秒激光物理和自由电子激光种子注入等应用成为可能。
