Observations of the intense soft x-ray emissions from ultrathin Au films irradiated with high contrast laser pulses

Ishino, Masahiko; Kado, M.; Nishikino, Masaharu; Shinohara, Kunio; Tamotsu, Satoshi; Yasuda, Keiko; Hasegawa, Noboru; Kishimoto, Maki; Ohba, Toshiyuki; Kawachi, Tetsuya

doi:10.1117/12.839945

Cited by 2 publications

(3 citation statements)

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“…An obvious dependence of the emitted x-ray intensities on the Au film thickness was seen, and the highest intensity was observed at the Au film target with the thickness of 28 nm. In our previous experiments 4 , soft x-ray photons more than 2.3x10 14 photons/sr/mm 2 /eV/pulse were estimated for a soft x-ray source. This value was almost the same of order of magnitude as that of 50 μm thick bulk target observed from the front side.…”

Section: Introductionmentioning

confidence: 99%

“…The details of fabrication of Au film targets were described in Ref. 4. Thicknesses of Au film target and Si 3 N 4 membrane were 28 nm and 100 nm, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Then, the laser pulse was focused onto the Au film surface by a lens having a focal length of 150 mm. The peak intensity was estimated to be about 2 x 10 14 W/cm 2 on the film surface 4 . The OPCPA pre-amplifier was useful for suppressions of unexpected pre-pulse and of an amplification of spontaneous emission generation, so that the Au film target was irradiated by the pre-pulse free high contrast (> 10 6 ) laser pulse.…”

Section: Introductionmentioning

confidence: 99%

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Development of a specimen holder combined with ultra thin film laser plasma x-ray source for compact contact-type soft x-ray microscope to observe hydrated living biological cells

et al. 2011

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Ultra thin gold films having a thickness of 20-30 nm are favorable laser plasma targets for a soft x-ray microscopy, because the ultra thin films emit intense soft x-rays at the wavelength of water window region from the rear side with respect to the surface irradiated with short pulse laser. Using rear side emissions, the distance between the x-ray source and the specimens can be reduced so that the x-ray flux on specimens increases. In addition, the microscope system can be designed to be compact when the specimen holder and x-ray source are combined in one piece. In the present study, the biological specimen holder combined with a gold ultra thin film plasma target has been developed for a contact-type soft x-ray microscope. This x-ray microscope system needs not any x-ray optics such as a condenser and/or an objective optics which causes a decrease in x-ray photons for imaging. Specimen holder equipped with the plasma target keeps biological specimens at wet condition in vacuum. In this study, x-ray images of hydrated living cells (MH-S mouse alveolar macrophage cell line) have been obtained successfully by use of the newly developed specimen holder. These experimental results reveal that the soft x-ray image can be taken safely. Specimen holder combined with plasma x-ray source will be a key component of a compact soft x-ray microscope using in a laboratory.

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Section: Introductionmentioning

confidence: 99%

“…The details of fabrication of Au film targets were described in Ref. 4. Thicknesses of Au film target and Si 3 N 4 membrane were 28 nm and 100 nm, respectively.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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