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High-brightness optical-field-ionization collisional-excitation extreme-ultraviolet lasing pumped by a 100-TW laser system in an optically preformed plasma waveguide
Authors:B. K. Chen  Y.-C. Ho  T.-S. Hung  Y.-L. Chang  M.-C. Chou  S.-Y. Chen  H.-H. Chu  S.-L. Huang  P.-H. Lin  J. Wang  J.-Y. Lin
Affiliation:1. Department of Physics, National Central University, Jhongli, 32001, Taiwan
2. Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, 10617, Taiwan
3. Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei, 10617, Taiwan
4. Department of Physics, National Chung Cheng University, Chia-Yi, 62102, Taiwan
5. Department of Electrical Engineering, National Taiwan University, Taipei, 10617, Taiwan
6. Department of Physics, National Taiwan University, Taipei, 10617, Taiwan
Abstract:Recent study on optical-field-ionization collisional-excitation extreme-ultraviolet lasing of Ni-like krypton at 32.8 nm pumped by a 100-TW laser system with an optically preformed plasma waveguide is reported. By using a 9-mm-long pure krypton plasma waveguide fabricated with the axicon-ignitor-heater scheme, the 32.8-nm extreme-ultraviolet laser provided an average output of 1012 photons/pulse at pump energy of 1 J, more than one order of magnitude enhancement relative to the previous results with the same scheme at pump energy of 235 mJ. It is also found the far-field pattern of laser beams varies from a single peak profile at low pump energy to an annular profile at high pump energy due to over-ionization of krypton ions at the center of the plasma channel.
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