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Matsuoka, Leo; Ogawa, Kenta*; Yokoyama, Keiichi
Proceedings of 10th Conference on Lasers and Electro-Optics Pacific Rim and 18th OptoElectronics and Communications Conference and Photonics in Switching 2013 (CLEO-PR & OECC/PS 2013) (USB Flash Drive), 2 Pages, 2013/06
Ichihara, Akira; Matsuoka, Leo; Kurosaki, Yuzuru; Yokoyama, Keiichi
Proceedings of 10th Conference on Lasers and Electro-Optics Pacific Rim and 18th OptoElectronics and Communications Conference and Photonics in Switching 2013 (CLEO-PR & OECC/PS 2013) (USB Flash Drive), 2 Pages, 2013/06
Computer simulations were performed for studying isotope-selective excitation of lithium chloride using a terahertz frequency comb. The time evolution of rovibrational population was calculated by the close-coupling method. The 
Li
Cl molecule was excited selectively in gaseous mixture of LiCl and Li
Cl by adjusting pulse parameters. Moreover, the wave packet calculations were performed to investigate the dissociation process. More than half of LiCl in the rovibrational state (v=0, J=150) were dissociated by the second pulse.
Ogawa, Kanade*; Sato, Takahiro*; Matsubara, Shinichi*; Okayasu, Yuichi*; Togashi, Tadashi*; Watanabe, Takahiro*; Takahashi, Eiji*; Midorikawa, Katsumi*; Aoyama, Makoto; Yamakawa, Koichi; et al.
Proceedings of 10th Conference on Lasers and Electro-Optics Pacific Rim and 18th OptoElectronics and Communications Conference and Photonics in Switching 2013 (CLEO-PR & OECC/PS 2013) (USB Flash Drive), 2 Pages, 2013/06
no abstracts in English
O
crystalSuzuki, Masayuki; Kiriyama, Hiromitsu; Nakai, Yoshiki; Okada, Hajime; Daito, Izuru; Kagebayashi, Yoshio*; Yokota, Toshio*; Bolton, P.; Daido, Hiroyuki; Kawanishi, Shunichi
Optics Communications, 283(3), p.451 - 453, 2010/02
Times Cited Count：0 Percentile：0(Optics)We have demonstrated efficient frequency doubling of high energy fundamental Nd:YAG laser pulse energy of the multi-J level at a high repetition rate using high optical quality top-seeded solution growth CsBO (TSSG-CBO) crystal. Second-harmonic (532 nm) generation (SHG) output energy of 12 W at 10 Hz is obtained with a conversion efficiency of 60% The numerical calculation SHG efficiency agrees well with the measured results. These results indicate that CBO is a good candidate material for high energy SHG of Nd-doped lasers at the several J level or more with high repetition rate.
Tanaka, Momoko; Kiriyama, Hiromitsu; Ochi, Yoshihiro; Nakai, Yoshiki; Sasao, Hajime; Okada, Hajime; Daido, Hiroyuki; Bolton, P.; Kawanishi, Shunichi
Optics Communications, 282(22), p.4401 - 4403, 2009/11
Times Cited Count：11 Percentile：49.53(Optics)We have demonstrated that we can homogenize the spatial profile of a high-energy green laser pulse used for pumping a petawatt scale Ti:sapphire amplifier. The second harmonic of a high-energy, large-aperture Nd:glass laser system generates laser emission at a green wavelength with 75 J single pulse energy. Using a diffractive optical element for beam homogenization, we have obtained a highly spatially uniform flat-top second harmonic profile.
Kiriyama, Hiromitsu; Mori, Michiaki; Nakai, Yoshiki; Shimomura, Takuya; Tanoue, Manabu*; Akutsu, Atsushi; Okada, Hajime; Motomura, Tomohiro*; Kondo, Shuji; Kanazawa, Shuhei; et al.
Optics Communications, 282(4), p.625 - 628, 2009/02
Times Cited Count：54 Percentile：89.85(Optics)We demonstrate a high-contrast, high-intensity double chirped-pulse amplification (CPA) Ti:sapphire laser system using an optical parametric chirped-pulse (OPCPA) pre- amplifier. By injecting cleaned microjoule seed pulses into the OPCPA, a temporal contrast greater than 
within picosecond times before the main femtosecond pulse is demonstrated with an output pulse energy of 1.7 J and a pulse duration of 30 fs, corresponding to a peak power of 60 TW at a 10 Hz repetition rate. This system uses a cryogenically-cooled Ti:sapphire final amplifier and generates focused peak intensities in excess of 
W/
.
Terranova, F.*; Kiriyama, Hiromitsu; Pegoraro, F.*
Optics Communications, 281(19), p.4993 - 4997, 2008/10
Times Cited Count：4 Percentile：25.11(Optics)In this paper we discuss the bandwidth enhancement that can be achieved in multi-joule optical parametric chirped pulse amplification (OPCPA) systems exploiting the tenability of parametric amplification. We demonstrate that a bandwidth enhancement up to 50% is possible using multi-beam operation of OPCPA amplifiers.
Ozu, Akira; Kato, Masaaki; Maruyama, Yoichiro
Optics Communications, 177(1-6), p.355 - 361, 2000/04
Times Cited Count：4 Percentile：26.53(Optics)no abstracts in English
Kiriyama, Hiromitsu; Matsuoka, Shinichi; Maruyama, Yoichiro; Arisawa, Takashi
Optics Communications, 174(5-6), p.499 - 502, 2000/02
Times Cited Count：6 Percentile：34.7(Optics)no abstracts in English
