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Journal Articles

Terahertz absorption spectroscopy of protein-containing reverse micellar solution

Murakami, Hiroshi; Toyota, Yuji*; Nishi, Takaki*; Nashima, Shigeki*

Chemical Physics Letters, 519-520, p.105 - 109, 2012/01

 Times Cited Count:14 Percentile:44.66(Chemistry, Physical)

no abstracts in English

Journal Articles

Proton generation and terahertz radiation from a thin-foil target with a high-intensity laser

Sagisaka, Akito; Pirozhkov, A. S.; Mori, Michiaki; Yogo, Akifumi; Ogura, Koichi; Orimo, Satoshi; Nishiuchi, Mamiko; Ma, J.*; Kiriyama, Hiromitsu; Kanazawa, Shuhei; et al.

Reza Kenkyu, 38(9), p.702 - 705, 2010/09

High-intensity laser and thin-foil interactions produce high-energy particles, hard X-ray, high-order harmonics, and terahertz (THz) radiation. A proton beam driven by a high-intensity laser has received attention as a compact ion source for medical applications. In this study we have tested simultaneous generation of protons and THz radiation from a thin-foil target. We use a Ti:sapphire laser system (J-KAREN) at JAEA. A laser beam is focused by an off-axis parabolic mirror at the thin-foil target. We observed the high-energy proton in the rear side of the target and THz radiation in the reflected direction. Next, high energy protons are observed by reducing the size of preformed plasma.

Journal Articles

Dependence on chirp rate and spectral resolution of the terahertz field pulse waveform measured by electro-optic detection using a chirped optical pulse and a spectrometer and its effect on terahertz spectroscopy

Murakami, Hiroshi; Shimizu, Kohei*; Katsurada, Masaaki; Nashima, Shigeki*

Journal of Applied Physics, 104(10), p.103111_1 - 103111_7, 2008/11

 Times Cited Count:5 Percentile:74.84(Physics, Applied)

Journal Articles

Simultaneous generation of a proton beam and terahertz radiation in high-intensity laser and thin-foil interaction

Sagisaka, Akito; Daido, Hiroyuki; Nashima, Shigeki*; Orimo, Satoshi; Ogura, Koichi; Mori, Michiaki; Yogo, Akifumi; Ma, J.-L.; Daito, Izuru; Pirozhkov, A. S.; et al.

Applied Physics B, 90(3-4), p.373 - 377, 2008/03

 Times Cited Count:57 Percentile:6.95(Optics)

High-intensity laser and thin-foil interactions produce high energy ions, electrons, hard X-ray, and terahertz radiation. The simultaneous generation of the protons and terahertz radiation will provide us unique applications. In this study we use a Ti:sapphire laser system (JLITE-X) at JAEA for simultaneous generation of the protons and terahertz radiation. The laser beam is focused by an off-axis parabolic mirror at the Ti target surface. The estimated peak intensity is $$sim$$2$$times$$10$$^{17}$$W/cm$$^{2}$$. The simultaneous generation of the protons and terahertz radiation are observed by reducing the ASE duration.

Journal Articles

Intense femto-second laser-driven X-ray source coupled with multiple directional quantum beams for applications

Daido, Hiroyuki; Sagisaka, Akito; Ogura, Koichi; Orimo, Satoshi; Nishiuchi, Mamiko; Yogo, Akifumi; Mori, Michiaki; Li, Z.*; Kiriyama, Hiromitsu; Kanazawa, Shuhei; et al.

X-Ray Lasers 2006; Springer Proceedings in Physics, Vol.115, p.595 - 605, 2007/00

At present, using ultra-short high intensity lasers at APRC, JAEA Kansai photon research institute, we are developing laser driven multiple quantum beams such as protons, X-rays, electrons and THz waves. These beams are perfectly synchronized with each other. The pulse duration of each beam is lass than a pico-second. They have sharp directionality with high brightness. If we properly combined these, we have new pump-probe techniques for various applications.

Oral presentation

Development of systems for light-pump/terahertz-probe spectroscopy; Single-shot measurement of terahertz wave

Shimizu, Kohei; Katsurada, Masaaki; Murakami, Hiroshi; Nashima, Shigeki*; Hosoda, Makoto*

no journal, , 

no abstracts in English

Oral presentation

Simultaneous generation of proton beam and terahertz radiation under intense ultrashort pulse-laser irradiation

Sagisaka, Akito; Daido, Hiroyuki; Pirozhkov, A. S.; Ogura, Koichi; Orimo, Satoshi; Mori, Michiaki; Yogo, Akifumi; Nakamura, Shu*; Iwashita, Yoshihisa*; Shirai, Toshiyuki*; et al.

no journal, , 

no abstracts in English

Oral presentation

Development of pump-probe THz spectroscopy measurement system and its application to solution systems, 2

Shimizu, Kohei; Katsurada, Masaaki; Murakami, Hiroshi; Nashima, Shigeki*; Hosoda, Makoto*

no journal, , 

no abstracts in English

Oral presentation

Generation of high-energy proton and electromagnetic waves with a high-intensity laser

Sagisaka, Akito; Daido, Hiroyuki; Pirozhkov, A. S.; Ma, J.-L.; Yogo, Akifumi; Ogura, Koichi; Orimo, Satoshi; Mori, Michiaki; Nishiuchi, Mamiko; Kawachi, Tetsuya; et al.

no journal, , 

High-intensity laser and thin-foil interactions produce high energy ions, electrons, X-ray, high-order harmonics, and THz radiation. High-energy protons driven by the high-intensity laser is paid attention as a compact ion source for medical application. The simultaneous generation of the protons and THz or harmonics will provide us high-density plasma diagnostic or unique pump-probe techniques. We use a Ti:sapphire laser system (JLITE-X) in JAEA for THz radiation. The laser beam is focused by an off-axis parabolic mirror at the 5 $$mu$$m thick Ti target. We observe simultaneously both the high-energy proton and THz radiation by changing the duration of ASE preceding the main pulse. We use a Ti:sapphire laser system in CRIEPI for harmonic generation. The laser beam is focused by an off-axis parabolic mirror at the 7.5 $$mu$$m thick polyimide target surface. The high-energy protons and UV harmonics are observed at the target is moved away from the best focus.

Oral presentation

Terahertz spectroscopy of protein aqueous with reverse micelles solution

Toyota, Yuji; Nishi, Takaki; Murakami, Hiroshi; Nashima, Shigeki*; Hosoda, Makoto*

no journal, , 

no abstracts in English

Oral presentation

Generation of high-energy protons and THz radiation with the thin-foil target

Sagisaka, Akito; Pirozhkov, A. S.; Daido, Hiroyuki; Ogura, Koichi; Orimo, Satoshi; Yogo, Akifumi; Daito, Izuru; Nishiuchi, Mamiko; Mori, Michiaki; Nashima, Shigeki*; et al.

no journal, , 

no abstracts in English

Oral presentation

Observation of long-wavelength electromagnetic radiation generated via intense laser matter interaction

Kando, Masaki; Nashima, Shigeki*; Pirozhkov, A. S.; Hayashi, Yukio; Kotaki, Hideyuki; Bulanov, S. V.

no journal, , 

We irradiated laser pulses with energy of 400 mJ - 1J and the pulse duration of 30 fs onto a helium gas-jet target with the irradiance of 10$$^{19}$$ W/cm$$^2$$ and measured the long wavelength ($$sim$$ THz) electromagnetic radiation with a DTGS detector. Among the known mechanism of THz generation via laser-matter interaction, we focus on the soliton mechanism that the laser pulse depletes its energy and its energy is converted to lower frequency light. With a probe light, we observed soliton-like structures. With the DTGS, many noises were obtained when the laser intensity and laser contrast increases.

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