@article{oai:repo.qst.go.jp:00080415,
 author = {Kiriyama, Hiromitsu and Pirozhkov, Alexander and Nishiuchi, Mamiko and Fukuda, Yuuji and Sagisaka, Akito and Kon, Akira and Miyasaka, Yasuhiro and Ogura, Koichi and Dover, NicholasPeter and Kondo, Kotaro and Sakaki, Hironao and Kevin Koga, James and Timur, Esirkepov and HUANG, KAI and Nakanii, Nobuhiko and Kando, Masaki and Kondo, Kiminori and Bock, Stefan and Ziegler, Tim and Thomas, Püschel and Zeil, Karl and Schramm, Ulrich and Kiriyama, Hiromitsu and Pirozhkov, Alexander and Nishiuchi, Mamiko and Fukuda, Yuuji and Sagisaka, Akito and Kon, Akira and Miyasaka, Yasuhiro and Ogura, Koichi and Dover, NicholasPeter and Kondo, Kotaro and Sakaki, Hironao and Kevin Koga, James and Timur, Esirkepov and HUANG, KAI and Nakanii, Nobuhiko and Kando, Masaki and Kondo, Kiminori},
 issue = {9},
 journal = {Crystals},
 month = {Sep},
 note = {Ultra-high intensity femtosecond lasers have now become excellent scientific tools for the study of extreme material states in small scale laboratory settings. The invention of chirped-pulse amplification (CPA) combined with titanium-doped sapphire (Ti:sapphire) crystals have enabled realization of such lasers. The pursuit of ultra-high intensity science and applications is driving world-wide development of new capabilities. A petawatt (PW=10^15 W), femtosecond (fs=10^-15 s), repetitive (0.1 Hz), high beam quality J-KAREN-P (Japan Kansai Advanced Relativistic ENgineering Petawatt) Ti:sapphire CPA laser has been recently constructed and used for accelerating charged particles (ions and electrons) and generating coherent and incoherent ultra-short pulse, high energy photon (x-ray) radiation. Ultra-high intensities of 10^22 W/cm^2 with high temporal contrast of 10^-12 and a minimal number of pre-pulses on target has been demonstrated with the J-KAREN-P laser. Here, world-wide ultra-high intensity laser development is summarized, the output performance and spatiotemporal quality improvement of the J-KAREN-P laser are described, and some experimental results are briefly introduced.},
 title = {Petawatt femtosecond laser pulses from titanium-doped sapphire crystal},
 volume = {10},
 year = {2020}
}