会議発表用資料 Characterization of the J-KAREN-P laser spot at 300 TW and pulse shape at full beam diameter

ピロジコフ, アレキサンダー  ,  福田, 祐仁  ,  西内, 満美子  ,  桐山, 博光  ,  匂坂, 明人  ,  小倉, 浩一  ,  森, 道昭  ,  岸本, 牧  ,  榊, 泰直  ,  ドーバー, ニコラス ピーター  ,  近藤, 康太郎  ,  中新, 信彦  ,  黄, 開  ,  Kanasaki, M  ,  近藤, 公伯  ,  神門, 正城

2017-05-10
内容記述
J-KAREN-P [1] is a high-power laser facility aiming at highest beam quality and highest irradiance for performing state-of-the art experiments at the frontier of modern science.We have recently approached the physical limits of the beam quality: diffraction limit of the focal spot and bandwidth limit of the pulse shape [2]. In particular, we have measured the focal spot after an f/1.3 off-axis parabolic mirror during 0.3 PW operation. The laser beam was attenuated by ten wedges with high surface quality confirmed with interferometry. The resulting focal spot had the effective radius of ~1.0 μm and the Strehl ratio of ~0.5. We thus achieved the highest at-focus irradiance of ~10^22 W/cm^2.We have also performed full-beam duration measurement, down-collimating the Ø280 mm beam to a few mm using a telescope consisting of the main f = 2,600 mm and additional f = 2.54 mm off-axis parabolic mirrors. The full-beam pulse duration and shape were nearly identical to the duration and shape measured using a few mm diameter pick-off, confirming high spatiotemporal quality of the beam and absence of the spatiotemporal couplings.[1]. H. Kiriyama, M. Mori, A. S. Pirozhkov, et al., "High-Contrast, High-Intensity Petawatt-Class Laser and Applications," IEEE J. Sel. Topics Quantum Electron. 21 1601118-18 (2015).[2]. A. S. Pirozhkov, Y. Fukuda, M. Nishiuchi, H. Kiriyama, A. Sagisaka, K. Ogura, M. Mori, M. Kishimoto, H. Sakaki, N. P. Dover, K. Kondo, M. Kanasaki, K. Kondo, and M. Kando, "Approaching the diffraction-limited, bandwidth-limited Petawatt," (submitted).
Opto 2017 Symposium on Photon and Beam Science

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