Fyzikální ústav Akademie věd ČR

Selected results of department 54

Laser-ablation rates measured using x-ray laser transmission

The rate of laser ablation at irradiances of 2 x 1014 W/cm2 of solid iron has been measured using the transmission of a neonlike zinc x-ray laser at 21.2 nm through thin iron targets.

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Focusing a multimillijoule soft x-ray laser at 21 nm

We have focused the beam of currently the most powerful soft x-ray laser at 21 nm using a spherical Mo:Si multilayer mirror. The energy density within the 40 micron x 60 micron focal spot was 48 J /cm2, which corresponds to radiation peak intensity of 5 x 1011 W/cm2.

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Surface modification of organic polymer by dual action of extreme ultraviolet/visible-near infrared ultrashort pulses

We have experimentally demonstrated the evidence of structural surface modifications of polymethyl- methacrylate (PMMA) caused by simultaneous action of extreme ultraviolet (XUV) (similar to 21 nm) and visible-near infrared (visible-NIR) (820/410 nm) ultrashort pulses. Although the fluence of each individual beam was far below the surface modification threshold, very efficient and specific material expansion was observed after irradiation of PMMA by more than similar to 20 shots of mixed XUV/visible-NIR radiation.

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Plasma-based X-ray laser at 21 nm for multidisciplinary applications

We have developed so far the most energetic X-ray laser at 21 nm. The unique parameters of this half-cavity based X-ray laser such as record output energy of 10 mJ, highly symmetric beam, robustness and reproducibility, have made it possible to carry out a number of multidisciplinary scientific projects featuring novel applications of intense coherent X-ray radiation.

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