We have developed the world’ s first vacuum ultra-violet laser (6.994eV) based angle resolved photoemission system with a super-high energy resolution better than 1meV .

FIG. 1 A picture of the VUV laser-based ARPES system which is composed of two main parts: VUV laser optical system and angle resolved photoemission spectrometer.

FIG. 2 A schematic layout of our VUV laser optical system.

The key part of our laser system: The photon energy can be doubled by this KBBF crystal.

FIG. 3 KBBF Crystal

References：
  • Guodong Liu, et al., Review of Scientific Instruments 79 (2008) 023105.

    • Performance of our Laser ARPES:


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    Y.Y.Peng, X.J.Zhou* etc. arXiv:1302.3017, (Submitted to Nature Communications)