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High-aspect 3D two-photon polymerization structuring with widened objective working range (WOW-2PP)

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Light(Science & Applications) 2013年第1期2卷 9-12页

作者： Kotaro Obata Ayman el-Tamer Lothar Koch Ulf Hinze Boris N Chichkov laser zentrum hannover e.v. 30419 HannoverGermany

We developed a novel two-photon polymerization(2PP)configuration for fabrication of high-aspect three-dimensional(3D)structures,with an overall height larger than working distance of the microscope objective used for laser beam focusing into a photosensitive *** method is based on a modified optical 2PP setup,where a microscope objective(1003 high N.A.),immersion oil and cover glass can be moved together into the photosensitive material,resulting in an effective higher and wider objective working range(WOW-2PP).The proposed technique enables the fabrication of high-aspect structures with sub-micrometer process resolution.3D structures with a height of 7 mm are demonstrated,which could hardly be built with the conventional 2PP set-up due to refractive index mismatch and laser beam disturbances.

关键词： femtosecond laser large-scale structuring laser material processing photochemistry two-photon polymerization

Ion emission from warm dense matter produced by irradiation with a soft x-ray free-electron laser

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Matter and Radiation at extremes 2024年第1期9卷 71-84页

作者： Josef Krása Tomás Burian vera Hájková Jaromír Chalupský Šimon Jelínek Katerina Frantálová Michal Krupka Zuzana Kuglerová Sushil Kumar Singh vojtech vozda Ludek vysín MichalŠmíd Pablo Perez-Martin Marion Kühlman Juan Pintor Jakub Cikhardt Matthias Dreimann Dennis eckermann Felix Rosenthal Sam M.vinko Alessandro Forte Thomas Gawne Thomas Campbell Shenyuan Ren YuanFeng Shi Trevor Hutchinson Oliver Humphries Thomas Preston Mikako Makita Motoaki Nakatsutsumi Xiayun Pan Alexander Köhler Marion Harmand Sven Toleikis Katerina Falk Libor Juha Department of Radiation and Chemical Physics Institute of PhysicsCzech Academy of SciencesNa Slovance 218221 Prague 8Czech Republic laser Plasma Department Institute of Plasma PhysicsCzech Academy of SciencesZa Slovankou 318200 Prague 8Czech Republic Department of Surface and Plasma Science Faculty of Mathematics and PhysicsCharles University in PragueV Holesovi ckách 218000 Prague 8Czech Republic Department of Physical electronics Faculty of Nuclear Science and Engineering PhysicsCzech Technical University in PragueV Holesovi ckách 218000 Prague 8Czech Republic Helmholtz-zentrum Dresden-Rossendorf Bautzner Landstraße 40001328 DresdenGermany DeSY Photon Science Notkestraße 85D-22607 HamburgGermany Institut de Minéralogie de Physique des Matériaux et de CosmochimieUMR 7590–UPMC/CNRS/IRD/MNHNSorbonne Université4 place Jussieu75005 ParisFrance Department of Physics Faculty of Electrical EngineeringCzech Technical University in PragueTechnická216627 Prague 6Czech Republic Center for Soft Nanoscience University of MünsterBusso-Peus-Straße 10D-48149 MünsterGermany Department of Physics Clarendon LaboratoryUniversity of OxfordParks RoadOxford OX13PUUnited Kingdom Central laser Facility STFC Rutherford Appleton LaboratoryDidcot OX110QXUnited Kingdom Lawrence Livermore National Laboratory 7000 East AvenueLivermoreCalifornia 94550USA european XFeL GmbH Holzkoppel 4D-22869 SchenefeldGermany Technische Universität Dresden 01062 DresdenGermany

We report on an experiment performed at the FLASH2 free-electron laser(FeL)aimed at producing warm dense matter via soft x-ray isochoric *** the experiment,we focus on study of the ions emitted during the soft x-ray ablation process using time-of-flight electron multipliers and a shifted Maxwell–Boltzmann velocity distribution *** find that most emitted ions are thermal,but that some impurities chemisorbed on the target surface,such as protons,are accelerated by the electrostatic field created in the plasma by escaped *** morphology of the complex crater structure indicates the presence of several ion groups with varying *** find that the ion sound velocity is controlled by the ion temperature and show how the ion yield depends on the FeL radiation attenuation length in different materials.

关键词： electrostatic emitted chemi

Advanced control and modeling of deposition processes

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Chinese Optics Letters 2013年第13期11卷 30-35页

作者： Detlev Ristau Henrik ehlers Centre of Quantum engineering and Space-Time Research Hannover Germany Department of laser Components Laser Zentrum Hannover e.V. Hannover Germany

During the last decade, striking improvements could be achieved for the precise control of deposition processes in optical coating technology. For example, as a consequence of enormous progresses in measure- ment and computer technology, direct optical monitoring in a broad spectral range can be considered as a common tool in many production e.v.ronments nowadays. Besides the development of the corresponding hardware and measurement channels, advanced approaches for the evaluation of the acquired data and new multiple sensor monitoring strategies moved into the focus of modern research on the way towards de- terministic deposition techniques. In this context, also innovative concepts for the simulation of deposition processes to forecast the result for a specified coating design and automatic online correction algorithms gained of importance to reduce the risk of failure in coating production. The present contribution will be dedicated to selected aspects in this field, especially addressing broad band optical monitoring systems. A short review on examples for existing hardware configurations and software tools will be presented illus- trating the advantages of modern process control techniques. Novel approaches based on the modeling of thin film growth are discussed as an additional strategy to improve the predictability of coating processes.

关键词： 310.1860 Deposition and fabrication 310.6845 Thin film devices and applications 280.4788 Optical sensing and sensors

miniSCIDOM: a scintillator-based tomograph for volumetric dose reconstruction of single laser-driven proton bunches

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High Power laser Science and engineering 2024年第2期12卷 41-50页

作者： A.Corvino M.Reimold e.Beyreuther F.-e.Brack F.Kroll J.Pawelke J.D.Schilz M.Schneider U.Schramm M.e.P.Umlandt K.Zeil T.Ziegler J.Metzkes-Ng Helmholtz-zentrum Dresden–Rossendorf DresdenGermany Technische Universität Dresden DresdenGermany OncoRay–National Center for Radiation Research in Oncology Faculty of Medicine and University Hospital Carl Gustav CarusTUD Dresden University of TechnologyHelmholtz-Zentrum Dresden–RossendorfDresdenGermany Current affiliation:Institut Curie UniversitéPSLCNRS UMR3347OrsayFrance Current affiliation:Universitätsklinikum Freiburg FreiburgGermany

laser plasma accelerators(LPAs)enable the generation of intense and short proton bunches on a micrometre scale,thus offering new experimental capabilities to research fields such as ultra-high dose rate radiobiology or material *** spectrally broadband,laser-accelerated proton bunches allow for tailored volumetric dose deposition in a sample.v.a single bunches to excite or probe specific sample *** rising number of such experiments indicates a need for diagnostics providing spatially resolved characterization of dose distributions with volumes of approximately 1 cm^(3) for single proton bunches to allow for fast online *** we present the scintillator-based miniSCIDOM detector for online single-bunch tomographic reconstruction of dose distributions in volumes of up to approximately 1 cm^(3).The detector achieves a spatial resolution below 500μm and a sensitivity of 100 *** detector performance is tested at a proton therapy cyclotron and an LPA proton *** experiments’primary focus is the characterization of the scintillator’s ionization quenching behaviour.

关键词： beam monitoring detectors laser-driven proton beams scintillator-based diagnostics ultra-high dose rate

Spatial separation effects in a guiding procedure in a modified ion-beam-sputtering process

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Light(Science & Applications) 2015年第1期4卷 109-116页

作者： Sina Malobabic Marco Jupé Detlev Ristau laser zentrum hannover e.v. Hollerithallee 8D-30419 HannoverGermany QUeST:Centre for Quantum engineering and Space-Time Research Leibniz Universität HannoverHannoverGermany

In the present state of the art,ion beam sputtering is used to produce low-loss dielectric *** the manufacturing of a dielectric layer stack,the deposition material must be changed,which requires rapid mechanical movement of vacuum *** mechanical components can be regarded as a risk factor for contamination during the coating process,which limits the quality of high-end laser *** minimize the particle contamination,we present a novel deposition concept that does not require movable components to change the coating material during the coating process.A magnetic field guiding technique has been developed,which enables the tuning of the refractive index in the layer structure by sputtering mixtures with varying compositions of two materials using a single-ion *** versatility of this new concept is demonstrated for a highreflection mirror.

关键词： eM field separation ion beam sputtering plasma guiding

Spatial heterogeneity of flesh-cell osmotic potential in sweet cherry affects partitioning of absorbed water

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Horticulture Research 2020年第1期7卷 2104-2113页

作者： eckhard Grimm Daniel Pflugfelder Jan Hahn Moritz Jonathan Schmidt Hendrik Dieckmann Moritz Knoche Institut für Gartenbauliche Produktionssysteme Leibniz Universität HannoverAbteilung ObstbauHerrenhäuser Straße 2D-30419 HannoverGermany Forschungszentrum Jülich IBG-2:PflanzenwissenschaftenWilhelm-Johnen-StraßeD-52428 JülichGermany laser zentrum hannover e.v. Hollerithallee 8D-30419 HannoverGermany

A fleshy fruit is commonly assumed to resemble a thin-walled pressure.v.ssel containing a homogenous carbohydrate *** sweet cherry(Prunus avium L.)as a model system,we investigate how local differences in cell water potential affect H2O and D2O(he.v. water)*** partitioning of H2O and D2O was mapped nondestructively using magnetic resonance imaging(MRI).The change in size of mesocarp cells due to water movement was monitored by optical coherence tomography(OCT,non-destructive).Osmotic potential was mapped using microosmometry(destructive).virtual sections through the fruit revealed that the H2O distribution followed a net pattern in the outer mesocarp and a radial pattern in the inner *** patterns align with the disposition of the.v.scular bundles.D2O uptake through the skin paralleled the acropetal gradient in cell osmotic potential gradient(from less negative to more negative).Cells in the.v.cinity of a vascular bundle were of more negative osmotic potential than cells more distant from a vascular *** revealed net H2O uptake was the result of some cells loosing volume and other cells increasing volume.H2O and D2O partitioning following uptake is non-uniform and related to the spatial heterogeneity in the osmotic potential of mesocarp cells.

关键词： potential Spatial bundle

Development of a 100 J,10 Hz laser for compression experiments at the High energy Density instrument at the european XFeL

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High Power laser Science and engineering 2018年第4期6卷 133-142页

作者： Paul Mason Saumyabrata Banerjee Jodie Smith Thomas Butcher Jonathan Phillips Hauke Hoppner Dominik Moller Klaus ertel Mariastefania De.v.do Ian Hollingham ANDrew Norton Stephanie Tomlinson Tinesimba Zata Jorge Suarez Merchan Chris Hooker Mike Tyldesley Toma Toncian Cristina HernANDez-Gomez Chris edwards John Collier Central laser Facility STFC Rutherford Appleton LaboratoryDidcotOX11 0QXUK Institute for Radiation Physics Helmholtz-Zentrum Dresden-Rossendorf e.V.D-01328 DresdenGermany

In this paper we review the design and development of a 100 J, 10 Hz nanosecond pulsed laser, codenamed DiPOLe100 X,being built at the Central laser Facility(CLF). This 1 kW average power diode-pumped solid-state laser(DPSSL) is based on a master oscillator power amplifier(MOPA) design, which includes two cryogenic gas cooled amplifier stages based on DiPOLe multi-slab ceramic Yb:YAG amplifier technology developed at the CLF. The laser will produce pulses between 2 and 15 ns in duration with precise, arbitrarily selectable shapes, at pulse repetition rates up to 10 Hz, allowing real-time shape optimization for compression experiments. Once completed, the laser will be delivered to the european X-ray Free electron laser(XFeL) facility in Germany as a UK-funded contribution in kind, where it will be used to study extreme states of matter at the High energy Density(HeD) instrument.

关键词： cryogenic lasers diode-pumped solid-state laser high energy lasers laser amplifiers Yb:YAG

Waterproof coatings for high-power laser cavities

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Light(Science & Applications) 2019年第1期8卷 1063-1068页

作者： Xinbin Cheng Siyu Dong Song Zhi Sebastian Paschel Istvan Balasa Detlev Ristau Zhanshan Wang MOe Key Laboratory of Advanced Micro-Structured Materials Shanghai 200092China Institute of Precision Optical engineering School of Physics Science and EngineeringTongji UniversityShanghai 200092China IFSA Collaborative Innovation Center Shanghai Jiao Tong UniversityShanghai 200240China laser zentrum hannover e.v. Laser Components DepartmentHannover 30419Germany

With the ever-increasing laser power and repetition rate,thermal control of laser media is becoming increasingly *** for widely used air cooling or a bonded heat sink,water cooling of a laser medium is more effective in removing waste ***,how to protect deliquescent laser media from water erosion is a challenging ***,novel waterproof coatings were proposed to shield Nd:Glass from water *** clarifying the dependence of the waterproof property of single layers on their microstructures and pore characteristics,nanocomposites that dope SiO_(2) in HfO_(2) were synthesized using an ion-assisted co-evaporation process to solve the issue of a lack of a highindex material that simultaneously has a dense amorphous microstructure and wide ***_(0.7)Si_(0.3)O_(2)/SiO_(2) multifunctional coatings were finally shown to possess an excellent waterproof property,high laser-induced damage threshold(LIDT)and good spectral performance,which can be used as the enabling components for thermal control in high-power laser cavities.

关键词： power high property

Simple route toward efficient frequency conversion for generation of fully coherent supercontinua in the mid-IR and Uv range

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Light(Science & Applications) 2016年第1期5卷 216-223页

作者： Ihar Babushkin Ayhan Tajalli Hakan Sayinc Uwe Morgner Günter Steinmeyer Ayhan Demircan Institute of Quantum Optics Leibniz Universität Hannover30167 HanoverGermany Max Born Institute(MBI) 12489 BerlinGermany laser zentrum hannover e.v. 30419 HanoverGermany Hanover Centre for Optical Technologies 30167 HanoverGermany

Fiber supercontinua represent light sources of pivotal importance for a wide range of applications,ranging from optical communications to frequency *** spectra encompassing more than three octaves can be produced,the applicability of such spectra is strongly hampered due to coherence degradation during spectral *** pulse parameters at the cutting edge of currently available laser technology,we demonstrate the possibility of strongly coherent supercontinuum *** a fiber with two zero-dispersion wavelengths a higher-order soliton experiences a temporal breakdown,without any compression or splitting behavior,which leads to nearly complete conversion of input solitonic radiation into resonant nonsolitonic radiation in the dispersive wave *** the process is completely deterministic and shows little sensitivity to input noise,the resulting pulses appear to be compressible down to the sub-cycle level and may thus hold a new opportunity for direct generation of attosecond pulses in the.v.sible to near ultraviolet wavelength range.

关键词： attosecond pulses optical solitons supercontinuum ultrashort pulses