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Kiriyama, Hiromitsu; Mori, Michiaki; Nakai, Yoshiki; Shimomura, Takuya; Sasao, Hajime; Tanaka, Momoko; Ochi, Yoshihiro; Tanoue, Manabu*; Okada, Hajime; Kondo, Shuji; et al.
Applied Optics, 49(11), p.2105 - 2115, 2010/04
Times Cited Count：39 Percentile：83.22(Optics)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 compressed pulse without pumping the final amplifier we found that the temporal contrast in this system exceeds 10
on the sub-nanosecond timescales, and is near 10
on the nanosecond timescale prior to the peak of 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 a near-perfect top-hat-like intensity distribution.
Terranova, F.*; Bulanov, S. V.; Esirkepov, T. Z.; Kiriyama, Hiromitsu; Tajima, Toshiki; Collier, J. L.*; Migliozzi, P.*; Pegoraro, F.*
International Journal of Modern Physics B, 21(3&4), p.351 - 360, 2007/02
In the forthcoming decades, the physics of massive neutrinos will pose unprecedented challenges to traditional acceleration techniques. In this talk we revise the main motivations for pursuing neutrino oscillation studies with novel neutrino sources and, particularly, we consider the opportunities offered by laser-plasma accelerators. The existence of efficient ion acceleration regimes in collective laser-plasma interactions opens up the possibility to develop neutrino and, more generally, high-energy physics facilities in conjunction with projects for inertial confinement nuclear fusion (ICF) and neutron spallation sources. Moreover, parametric amplification techniques allow pulse compression implementations that do not fall in contradiction with current designs for ICF drivers. We discuss the conditions under which these efficient regimes can be put into operation and the perspectives for their empirical verification.
