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Journal Articles

High-energy diode-pumped picosecond regenerative amplification at 999 nm in wavelength with a cryogenically cooled Yb:LuLiF$$_{4}$$ crystal

Akahane, Yutaka; Aoyama, Makoto; Sugiyama, Akira; Kubo, Ryoichi; Ogawa, Kanade; Tsuji, Koichi; Yamakawa, Koichi

Optics Letters, 33(5), p.494 - 496, 2008/03

 Times Cited Count:2 Percentile:15.43(Optics)

A diode-pumped, cryogenically-cooled Yb:LuLiF$$_{4}$$ regenerative amplifier has been developed for the first time to our knowledge. A chirped-seed pulse was amplified and compressed in the regenerative amplifier, simultaneously, which generated $$sim$$6-mJ, 13-ps pulses at 999 nm wavelength without a pulse compressor. Simultaneous lasing at 999 nm and 1024 nm, respectively, was demonstrated, which could be used for different frequency generation in the THz region.

Journal Articles

Generation and evaluation of a 10$$^{20}$$ W/cm$$^{2}$$ intensity by focusing wavefront corrected 100 TW, 10 Hz laser pulses

Akahane, Yutaka; Ma, J.; Fukuda, Yuji; Aoyama, Makoto; Kiriyama, Hiromitsu; Inoue, Norihiro*; Tsuji, Koichi*; Nakai, Yoshiki*; Yamamoto, Yoichi*; Sheldakova, J. V.*; et al.

Japanese Journal of Applied Physics, Part 1, 44(8), p.6087 - 6089, 2005/08

 Times Cited Count:1 Percentile:4.93(Physics, Applied)

An improvement of laser-focused peak intensity has been achieved in a JAERI 100 TW Ti:sapphire chirped-pulse amplifier chain with a feedback-controlled adaptive optics system. Measurements of optical parameters of the laser pulse and an experimental tunneling ionization ratio of a rare gas atom with laser energy scaling have practically confirmed an ultrarelativistic intensity of over 10$$^{20}$$ W/cm$$^{2}$$ operating at a 10 Hz repetition rate.

Journal Articles

Electron acceleration by a nonlinear wakefield generated by ultrashort (23-fs) high-peak-power laser pulses in plasma

Kando, Masaki; Masuda, Shinichi; Zhidkov, A.*; Yamazaki, Atsushi; Kotaki, Hideyuki; Kondo, Shuji; Homma, Takayuki*; Kanazawa, Shuhei; Nakajima, Kazuhisa; Hayashi, Yukio; et al.

Physical Review E, 71(1), p.015403_1 - 015403_4, 2005/01

 Times Cited Count:33 Percentile:79.46(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Relativistic laser plasma from micron-sized argon clusters as a debris-free X-ray source for pulse X-ray diffraction

Fukuda, Yuji; Akahane, Yutaka; Aoyama, Makoto; Inoue, Norihiro*; Ueda, Hideki; Nakai, Yoshiki*; Tsuji, Koichi*; Yamakawa, Koichi; Hironaka, Yoichiro*; Kishimura, Hiroaki*; et al.

Applied Physics Letters, 85(21), p.5099 - 5101, 2004/11

 Times Cited Count:10 Percentile:41.51(Physics, Applied)

We have demonstrated diffraction from Si(111) crystal using X-rays from highly ionized Ar ions produced by laser irradiation with an intensity of 6$$times$$10$$^{18}$$ W/cm$$^{2}$$ and a pulse duration of 30 fs acting upon micron-sized Ar clusters. The measured total photon flux and line width in the He$$_{alpha1}$$ line (3.14 keV) were 4$$times$$10$$^{7}$$ photons/shot/4$$pi$$sr and 3.7 eV (FWHM), respectively, which is sufficient to utilize as a debris-free light source for time-resolved X-ray diffraction studies.

Journal Articles

Present status of advanced photon science research program related to X-, and $$gamma$$-ray emission source development

Arisawa, Takashi; Matoba, Toru; Yamakawa, Koichi; Maruyama, Yoichiro; Sasuga, Tsuneo; Wakaida, Ikuo; Nakajima, Kazuhisa*; Sasaki, Akira; Minehara, Eisuke; Oshima, Masumi

Proc. of the 1st International Induced Gamma Emision Workshop, p.29 - 41, 1999/00

no abstracts in English

Oral presentation

Cryogenically-cooled Yb:LLF picosecond chirped-pulse regenerative amplifier

Akahane, Yutaka; Aoyama, Makoto; Sugiyama, Akira; Kubo, Ryoichi; Ogawa, Kanade; Tsuji, Koichi; Yamakawa, Koichi

no journal, , 

A diode-pumped, cryogenically-cooled Yb$$^{3+}$$:LuLiF$$^{4}$$ regenerative amplifier has been developed for the first time to our knowledge, which generated 6-mJ, 13-ps pulses at 999 nm wavelength without a pulse compressor.

Oral presentation

Multi-millijoule, diode-pumped, picosecond regenerative amplifier at 999-nm wavelength with cryogenically-cooled Yb$$^{3+}$$:LuLiF$$_{4}$$ crystal

Akahane, Yutaka; Aoyama, Makoto; Kubo, Ryoichi; Sugiyama, Akira; Ogawa, Kanade; Tsuji, Koichi; Yamakawa, Koichi

no journal, , 

A diode-pumped, cryogenically-cooled Yb$$^{3+}$$:LuLiF$$_{4}$$ regenerative amplifier has been developed for the first time to our knowledge, which generated $$sim$$6-mJ, 13-ps pulses at 999 nm wavelength without a pulse compressor.

Oral presentation

LD-pumped, cryogenically-cooled Yb:LLF picosecond chirped-pulse regenerative amplifier

Akahane, Yutaka; Aoyama, Makoto; Sugiyama, Akira; Kubo, Ryoichi; Tsuji, Koichi; Ogawa, Kanade; Yamakawa, Koichi

no journal, , 

We have developed a diode-pumped, cryogenically-cooled Yb:LuLiF$$_{4}$$ regenerative amplifier, for the first time to our knowledge, which amplified 999 and 1024 nm chirped seed pulse to 6 and 8.5 mJ, respectively. Durations of amplified laser pulses in the regen were compressed to 13.2 ps and 27.4 ps in 999 and 1024 nm amplification, respectively, by gain-narrowing of chirped pulses, which enables us to apply output laser pulses to nonlinear applications directly without additional pulse compressor. We have also demonstrated simultaneous two-color lasing at 999 nm and 1024 nm, which could be used for different frequency generation in the THz region.

Oral presentation

Multi-millijoule, diode-pumped, chirped-pulse regenerative amplification at two wavelengths with cryogenically-cooled Yb$$^{3+}$$:LuLiF$$_{4}$$ crystal

Akahane, Yutaka; Aoyama, Makoto; Sugiyama, Akira; Kubo, Ryoichi*; Ogawa, Kanade; Tsuji, Koichi; Yamakawa, Koichi

no journal, , 

A diode-pumped regenerative amplification with cryogenically cooled Yb$$^{3+}$$ : LuLiF$$_{4}$$ crystal has been demonstrated for the first time to our knowledge. A chirped-seed pulse was amplified and compressed in the regenerative amplifier, simultaneously, which generated 6 mJ, 13 ps pulses at 999 nm in wavelength and 8.5 mJ, 27 ps pulses at 1024 nm, respectively, without a pulse compressor. Simultaneous lasing at 999 and 1024 nm was demonstrated, which could be used for different frequency generation in the terahertz region.

Oral presentation

Multi-millijoule picosecond regenerative chirped-pulse amplification of two wavelengths with cryogenically-cooled Yb$$^{3+}$$:LuLiF$$_{4}$$ crystal

Akahane, Yutaka; Aoyama, Makoto; Sugiyama, Akira; Kubo, Ryoichi*; Ogawa, Kanade; Tsuji, Koichi; Yamakawa, Koichi

no journal, , 

We have performed chirped-pulse regenerative amplification at 999 nm and 1024 nm wavelengths with cryogenically-cooled Yb$$^{3+}$$:LuLiF$$_{4}$$ crystal. High-energy amplified pulses with energies of 6 mJ and 8.5 mJ were obtained at 999 nm and 1024nm wavelengths, respectively. In the regen durations of output pulses were compressed to 13 ps and 27 ps, respectively by gain-narrrwoing, so these pulses are available as pump sources for nonlinear effects without additional pulse compression devices. Simultaneous two-color lasing was also performed in this study, which is available for differential frequency generation in THz region.

Oral presentation

Theoretical study of resonant inelastic X-ray scattering in iron pnictides

Nomura, Takuji; Yamakawa, Yoichi*; Yanagi, Yuki*; Ono, Yoshiaki*

no journal, , 

Resonant inelastic X-ray scattering (RIXS) measurements at the Fe $$K$$ edge have been performed for recently discovered iron-pnictide superconductors. The aim of the present study is to analyze theoretically the results of the experiments. Specifically, we use a 16-band d-p model, where the Fe3d and As4p orbitals are taken into account, and the electron correlation effects are taken into account within the random-phase approximation (RPA).

Oral presentation

Electron correlations and orbital excitations in resonant inelastic X-Ray scattering from iron-arsenide superconductor

Nomura, Takuji; Yamakawa, Yoichi*; Yanagi, Yuki*; Ono, Yoshiaki*

no journal, , 

no abstracts in English

Oral presentation

Spin nematic susceptibility studied by inelastic neutron scattering in FeSe

Shamoto, Shinichi; Kajimoto, Ryoichi; Ishikado, Motoyuki*; Yamakawa, Yoichi*; Watashige, Tatsuya*; Kasahara, Shigeru*; Nakamura, Mitsutaka; Kontani, Hiroshi*; Shibauchi, Takasada*; Matsuda, Yuji*

no journal, , 

no abstracts in English

13 (Records 1-13 displayed on this page)
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