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Article
Table-top kHz hard X-ray source with ultrashort pulse duration for time-resolved X-ray diffraction
The interaction of ultrashort laser pulses with solid state targets is studied concerning the production of short X-ray pulses with photon energies up to about 10 keV. The influence of various parameters such ...
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Article
Multi-kilohertz, ultrafast hard X-ray K α source
We report on the performance of a femtosecond laser-based hard X-ray Kα source operating up to 10 kHz repetition rate. Using chromium- or iron-containing tapes, spectrally narrow band Kα1 and Kα2 radiation at abo...
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Article
Optimization of type-II frequency doubling of spatial and temporal limited laser light in nonlinear crystals
Type-II frequency doubling of short Gaussian laser pulses is studied theoretically. The situation is analysed when the group velocity mismatch and the walk-off angle of the interacting waves limit the frequenc...
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Article
Harmonic generation in the discrete spectral region of xenon using broadband femtosecond laser pulses
The conversion of 34-fs Ti:sapphire laser pulses into the wavelength region 105–210 nm has been studied in xenon for laser intensities up to 5×1013 W/cm2. A strongly structured, pressure-dependent emission spectr...
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Chapter and Conference Paper
Adaptive Sha** of High-Power Broadband Femtosecond Laser Pulses
We demonstrate the implementation of a feedback controlled pulse sha** device in a femtosecond high-power Ti:sapphire laser system. The laser system consists of a mirror dispersion controlled oscillator and ...
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Article
DEGRO 2004
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Article
Abstracts der 3. Gemeinsamen Brachytherapiekonferenz SASRO/DEGRO/OEGRO
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Article
Efficient high-repetition-rate fs-laser based X-ray source
The generation of [ Fe]Kα line radiation has been studied on a compact, ultrashort, laser based hard X-ray source, particularly suited for high-repetition-rate laser systems (1 to >10 kHz)...
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Article
Observation of high-energy Pt(111) surface resonances excited by laser-generated XUV radiation
The surface electronic structure of platinum is investigated by photoemission using extreme ultraviolet light. High-order harmonics of amplified femtosecond Ti:sapphire radiation in the range hν=20 to 50 eV ar...
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Article
High-repetition-rate hard X-ray generation with sub-millijoule femtosecond laser pulses
Hard X-ray radiation is generated at 1-kHz repetition rate on metal targets using 30-fs sub-millijoule laser pulses. Spinning-disc targets of medium-Z (Ti, Cr, Fe, Ni, Cu, Zn and Mo) and high-Z (Ta) metals are...
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Article
Photoemission study of clean and c(4×2)-2CO-covered Pt (111) using high-harmonic radiation
An extreme ultraviolet (EUV) laser light source based on high-harmonic generation is presented. Coherent radiation in the photon energy range hν=20–120 eV is produced in the conversion media argon, neon and he...
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Article
Enhanced radiosensitivity in experimental tumours following erythropoietin treatment of chemotherapy-induced anaemia
The radiosensitivity of solid tumours in anaemic rats treated with recombinant human erythropoietin (rhEPO, epoetin beta) was studied. Anaemia was induced by a single dose of carboplatin (45 mg kg(-1) i.v.), r...
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Article
VUV generation by frequency tripling the third harmonic of a picosecond kHz Nd:YLF laser in xenon and mercury vapour
vac=351.165 nm) of a ps 1 kHz Nd:YLF laser system is frequency tripled in xenon and mercury vapour. About 4×104 photons per pulse, i.e. 4×107 photons/s, are generated in xenon yielding a conversi...
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Article
Histotomographische Untersuchungen zur Frage direkt radiogener Schmelzveränderungen
Das umfangreiche Schrifttum zur Strahlenkaries zeigt den kontroversen Forschungsstand. Eigene Untersuchungen haben direkt radiogene Veränderungen an der Schmelz-Dentin-Grenze histotomographisch nachweisen könn...
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Article
Neue Erkenntnisse zur Ätiologie der sogenannten Strahlenkaries
Die Ätiologie der Strahlenkaries wird trotz vieler Untersuchungen kontrovers diskutiert: Die These einer direkten radiogenen Läsion des Zahnhartgewebes steht der einer indirekten Pathogenese über die Radioxero...
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Article
Scattering of neutral NH3 clusters off LiF(100): angular distributions of NH3 and small clusters
The scattering behavior of neutral ammonia clusters off a LiF(100) surface is studied. Ammonia clusters are produced by a coexpansion of NH3 and Kr with an average kinetic energy of 48 meV per monomer molecule. U...
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Article
Generation of picosecond laser radiation at λ=87.8 nm with 1 kHz repetition rate
Coherent radiation at 87.78 nm is generated by four-wave mixing in argon gas. Radiation of a mode-locked Nd:YLF laser at λ=1053 nm is regeneratively amplified at 1 kHz repetition rate. After frequency quadrupl...
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Article
Secondary effects on solid surfaces stimulated by the cathode plasma flux in vacuum arcs
The conducting plasma region between the electrodes of a vacuum arc contains single-and multiple-charged ions of the cathode material. Investigation into the behaviour of this flux when it im**es upon a surf...
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Chapter and Conference Paper
Die Bedeutung von Operation, kraniospinaler Radiotherapie und Kombinationschemotherapie für die Prognose der Medulloblastome
In der Bundesrepublik Deutschland erkranken derzeit etwa 250–300 Kinder unter 16 Jahren an einem Tumor des Zentralnervensystems; von diesen sind 20% Medulloblastome. Die Fortschritte in der Chemotherapie diese...
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Chapter and Conference Paper
Ein neues Konzept zur Behandlung von Beckenwandrezidiven gynäkologischer Malignome
Beckenwandrezidive gynäkologischer Krebserkrankungen haben eine sehr schlechte Prognose, obwohl etwa die Hälfte der Patientinnen geheilt werden könnte, wenn eine lokale Sanierung erreicht würde. Aus tumor- und...
