Fiber Laser Development for Dielectric Laser-driven Accelerator and Electron Beam Source

Hayato Okamoto, Kazuyoshi Koyama, Shohei Otsuki, Daisuke Satoh, Tatsunori Shibuya, Mitsuru Uesaka, Mitsuhiro Yoshida, Schaa, Volker RW (Ed.), Petit-Jean-Genaz, Christine (Ed.), Kim, Dong Eon (Ed.), Kim, Kyung Sook (Ed.), Ko, In Soo (Ed.)
Our group is aiming for developing a table-top electronμbeam source, whose beam size is micro-meter order so that we can irradiate just the nuclei of cells (1μm) and observe the behavior in real time. This beam source will be realized by dielectric laser-driven accelerators(DLAs), which is expected to produce acceleration gradients of ~GV/m. To drive these accelerators, ultra-short pulse laser has to be incident to the structure*. We chose Ytterbium (Yb) fiber laser for generating and
more » ... ating and amplifying ultra-short laser pulse, which has high quantum efficiency and can easily pumped by LD, and is proper to produce ultra-short pulses because of its wide-band oscillation. We succeeded in getting ultra-short pulse (central wavelength: {1030} nm, average output: 10 W, pulse duration: ~10 ps, reputation rate: 84 MHz) from Yb fiber laser system. Also in order to make electron bunch by photo cathode, we then converted the obtained IR laser to UV of 258 nm (4ω) using BBO and LBO crystals. We are planning to amplify the pulses by Yb:YAG in future, which has its amplification band in {1030} nm.
doi:10.18429/jacow-ipac2016-thpow056 fatcat:muy7ya4xgbhvtjb3kilbhzog4m