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High-spatiotemporal-quality petawatt-class laser system

2010; Optica Publishing Group; Volume: 49; Issue: 11 Linguagem: Inglês

10.1364/ao.49.002105

0003-6935

Hiromitsu Kiriyama, Michiaki Mori, Yoshiki Nakai, Takuya Shimomura, H. Sasao, Momoko Tanaka, Yoshihiro Ochi, Manabu Tanoue, Hajime Okada, Shuji Kondo, Shuhei Kanazawa, A. Sagisaka, I. Daito, Daisuke Wakai, Fumitaka Sasao, Masayuki Suzuki, Hideyuki Kotakai, K. Kondo, A. Sugiyama, S. V. Bulanov, Paul R. Bolton, Hiroyuki Daido, Shunichi Kawanishi, John Collier, Cristina Hernandez–Gomez, C. J. Hooker, Klaus Ertel, Toyoaki Kimura, Toshiki Tajima,

High-pressure geophysics and materials

We have developed a femtosecond high-intensity laser system that combines both Ti:sapphire chirped-pulse amplification (CPA) and optical parametric CPA (OPCPA) techniques and produces more than 30 J broadband output energy, indicating the potential for achieving peak powers in excess of 500 TW. With a cleaned high-energy seeded OPCPA preamplifier as a front end in the system, for the compressed pulse without pumping the final amplifier, we found that the temporal contrast in this system exceeds 1010 on the subnanosecond time scales, and is near 1012 on the nanosecond time scale prior to the peak of the main femtosecond pulse. Using diffractive optical elements for beam homogenization of a 100 J level high-energy Nd:glass green pump laser in a Ti:sapphire final amplifier, we have successfully generated broadband high-energy output with a near-perfect top-hat-like intensity distribution.