量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum Science and Technology.
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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.
Petawatt femtosecond laser pulses from titanium-doped sapphire crystal
