Approaching the diffraction-limited, bandwidth-limited Petawatt

J-KAREN-P is a high-power laser facility aiming at the highest beam quality and irradiance for performing state-of-the art experiments at the frontier of modern science. Here we approached the physical limits of the beam quality: diffraction limit of the focal spot and bandwidth limit of the pulse s...

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Bibliographic Details
Published in:Optics express 2017-08, Vol.25 (17), p.20486-20501
Main Authors: Pirozhkov, Alexander S, Fukuda, Yuji, Nishiuchi, Mamiko, Kiriyama, Hiromitsu, Sagisaka, Akito, Ogura, Koichi, Mori, Michiaki, Kishimoto, Maki, Sakaki, Hironao, Dover, Nicholas P, Kondo, Kotaro, Nakanii, Nobuhiko, Huang, Kai, Kanasaki, Masato, Kondo, Kiminori, Kando, Masaki
Format: Article
Language:English
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Summary:J-KAREN-P is a high-power laser facility aiming at the highest beam quality and irradiance for performing state-of-the art experiments at the frontier of modern science. Here we approached the physical limits of the beam quality: diffraction limit of the focal spot and bandwidth limit of the pulse shape, removing the chromatic aberration, angular chirp, wavefront and spectral phase distortions. We performed accurate measurements of the spot and peak fluence after an f/1.3 off-axis parabolic mirror under the full amplification at the power of 0.3 PW attenuated with ten high-quality wedges, resulting in the irradiance of ~10 W/cm and the Strehl ratio of ~0.5.
ISSN:1094-4087
1094-4087
DOI:10.1364/oe.25.020486