EMMI ExtreMe Matter Institute

Darmstadt, Germany

EMMI ExtreMe Matter Institute

Darmstadt, Germany

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Aurand B.,Helmholtz Center for Heavy Ion Research | Aurand B.,Johannes Gutenberg University Mainz | Aurand B.,EMMI ExtreMe Matter Institute | Kuschel S.,Helmholtz Center for Heavy Ion Research | And 14 more authors.
Optics Express | Year: 2011

We report on the performance of a system employing a multi-layer coated mirror creating circularly polarized light in a fully reflective setup. With one specially designed mirror we are able to create laser pulses with an ellipticity of more than ε = 98% over the entire spectral bandwidth from initially linearly polarized Titanium:Sapphire femtosecond laser pulses. We tested the homogeneity of the polarization with beam sizes of the order of approximately 10 cm. The damage threshold was determined to be nearly 400 times higher than for a transmissive quartz-wave plate which suggests applications in high intensity laser experiments. Another advantage of the reflective scheme is the absence of nonlinear effects changing the spectrum or the pulse-form and the scalability of coating fabrication to large aperture mirrors. © 2011 Optical Society of America.


Aurand B.,Helmholtz Center for Heavy Ion Research | Aurand B.,Johannes Gutenberg University Mainz | Aurand B.,EMMI ExtreMe Matter Institute | Rdel C.,Helmholtz Center for Heavy Ion Research | And 18 more authors.
Review of Scientific Instruments | Year: 2012

We report on a four-mirror reflective wave-plate system based on a phase-shifting mirror (PSM) for a continuous variation of elliptical polarization without changing the beam position and direction. The system presented and characterized here can replace a conventional retardation plate providing all advantages of a PSM, such as high damage-threshold, large scalability, and low dispersion. This makes reflective wave-plates an ideal tool for ultra-high power laser applications. © 2012 American Institute of Physics.


Aurand B.,Helmholtz Center for Heavy Ion Research | Aurand B.,Johannes Gutenberg University Mainz | Aurand B.,EMMI Extreme Matter Institute | Elkin B.,Fraunhofer Institute for Interfacial Engineering and Biotechnology | And 13 more authors.
Journal of Radioanalytical and Nuclear Chemistry | Year: 2014

We report on the development of new materials for laser-ion acceleration applicable for the advanced mechanism of radiation-pressure-acceleration. These targets are ultra-thin with thicknesses of just a few nm. For several years, diamond-like carbon foils in this thickness range can be produced. An alternative material containing more than one ion-species has the potential to further improve the acceleration mechanism. The fabrication and characterization of self-supporting polymer-based targets will be described in this paper. Furthermore, we show the significant influence on a radiation-pressure induced acceleration process by experimental data. © 2013 Akadémiai Kiadó, Budapest, Hungary.


Aurand B.,Helmholtz Center for Heavy Ion Research | Aurand B.,Johannes Gutenberg University Mainz | Aurand B.,EMMI Extreme Matter Institute | Bierbach J.,Helmholtz Center for Heavy Ion Research | And 25 more authors.
Optics InfoBase Conference Papers | Year: 2012

We present first time data of monoenergetic multi-ion acceleration in the radiationpressure- dominated regime from few nm polymer foils. PIC-Simulations highlight a combined model of RPA with a field-dominated post acceleration process. ©OSA 2012.


Seres J.,Friedrich - Schiller University of Jena | Seres J.,University of Würzburg | Seres E.,Friedrich - Schiller University of Jena | Hochhaus D.,Helmholtz Center for Heavy Ion Research | And 12 more authors.
Nature Physics | Year: 2010

We present a new method for parametric amplification of soft-X-ray radiation. The laser-driven amplifier is based on parametric stimulated emission and is seeded with high-order-harmonic radiation generated in the same medium. The exponential increase of the soft-X-ray yield with increasing atomic density is experimentally demonstrated for two different sets of laser parameters. A small-signal gain up to 8×10 3 is obtained in both experiments at about 40 eV in argon using 350-fs-long laser pulses and with 6-fs-long ones at about 260 eV in helium, respectively. This new scheme reduces the pumping threshold for lasing with a comparable conversion efficiency into the millijoule level, which is about two orders of magnitude smaller compared with the conventional plasma X-ray lasers. With a simple model, we can estimate the necessary experimental conditions for identifying the spectral range and the magnitude of the maximum gain, which are in reasonable agreement with our measurements. © 2010 Macmillan Publishers Limited. All rights reserved.

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