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10月19日外宾学术报告：Recent progress on the J-KAREN-P laser facility

来源： 发布时间：2023-10-18【字体：大 中 小】

报告人：Prof. Hiromitsu Kiriyama

会议时间：10月19日（周四）11：00

会议地点：王大珩厅

报告内容：

We described the output performance and temporal quality enhancement of the J-KARENP petawatt laser facility. After wavefront correction using a deformable mirror, focusing with an f/1.3 off-axis parabolic mirror delivered a peak intensity of 10^22 W/cm^2 at 0.3 PW power levels. Technologies to improve the temporal contrast were investigated and tested. The origins of pre-pulses generated by post-pulses were identified and the elimination of most pre-pulses by removal of the post-pulses with wedged optics was achieved. A cascaded femtosecond optical parametric amplifier based on the utilization of the idler pulse rather than the signal pulse was developed for the complete elimination of the remaining pre-pulses. The orders of magnitude enhancement of the pedestal before the main pulse were obtained by using a higher surface quality of the convex mirror in the Öffner stretcher. A single plasma mirror was installed in the J-KAREN-P laser beam line for further contrast improvement of three orders of magnitude. The above developments indicate, although it has not been directly measured, the contrast can be as high as approximately 10^15 up to 40 ps before the main pulse. We also showed an overview of the digital transformation (DX) of the system, enabling remote and automated operation of the J-KAREN-P laser facility.

报告人简介:

Hiromitsu Kiriyama was born in Osaka, Japan. He received a Ph.D. degree in electrical engineering from Osaka University, Osaka, Japan, in 1998. His doctoral thesis focused on high power laser-diode pumped solid-state lasers for inertial confinement fusion at the Institute of Laser Engineering, Osaka University, Osaka, Japan. In 1998, he joined the Advanced Photon Research Center, Japan Atomic Energy Research Institute (JAERI), Kyoto, Japan. He is currently a Group Leader with the Advanced Laser Science Group, Kansai Institute for Photon Science (KPSI), National Institutes for Quantum Science and Technology (QST) (previously JAERI and the Japan Atomic Energy Agency). He is currently involved in laser research and development efforts and their applications for high field science. From 2010 to 2015, he was a Professor at the Graduate School of Life and Medical Science in the Collaborative Program at Doshisha University, since 2019 he has been a Professor at the Graduate School of Science and Engineering in the Collaborative Program at Doshisha University, Kyoto, Japan.

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