Ultrahigh-repetition-rate (1.1 GHz), deep-ultraviolet coherent light at 208.8 nm is generated by applying an external Fabry-Pérot cavity for repetition-rate multiplication to the fourth harmonics of a 10-ps, mode-locked Ti:sapphire laser. Its small pulse energy minimizes the unwanted space charge effect, while its high repetition rate drastically reduces the acquisition time in high-energy resolution angle-resolved photoemission spectroscopy using hemispherical electron analyzers. The absence of the space charge effect in the photoemission spectrum near the Fermi edge of polycrystalline Au at 8 K demonstrates this idea.

中文翻译：

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用于最小化高分辨率角分辨光发射光谱采集时间的千兆赫兹重复率窄带深紫外光源

超高重复率 (1.1 GHz)、208.8 nm 的深紫外相干光是通过应用外部法布里-珀罗腔产生重复率倍增至 10 ps 锁模钛蓝宝石激光器的四次谐波. 它的小脉冲能量最大限度地减少了不需要的空间电荷效应，而它的高重复率大大减少了使用半球电子分析仪的高能量分辨率角分辨光电子光谱的采集时间。在 8 K 时多晶 Au 的费米边缘附近的光发射光谱中没有空间电荷效应证明了这一想法。