High-spetiotemporal-quality OPCPA/Ti:sapphire petawatt-class laser system

Kiriyama, Hiromitsu; Mori, Michiaki; Nakai, Yoshiki*; Shimomura, Takuya; Sasao, Hajime*; Tanoue, Manabu*; Okada, Hajime; Kanazawa, Shuhei; Daito, Izuru; Sasao, Fumitaka; Suzuki, Masayuki; Kondo, Kiminori; Sugiyama, Akira; Bulanov, S. V.; Bolton, P.; Daido, Hiroyuki; Yokoyama, Atsushi; Kawanishi, Shunichi; Tajima, Toshiki

We have developed a femtosecond high intensity laser system, which combines both Ti:sapphire chirped-pulse amplification (CPA) and optical parametric chirped-pulse amplification (OPCPA) techniques, that 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 final compressed pulse we found that the temporal contrast in this system exceeds 10 on the sub-nanosecond timescale before the main femtosecond pulse. Using diffractive optical elements for beam homogenization of 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 near-perfect top-hat intensity distributions.