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Bernd Schäfer has extensive business experience. Prior to his recent role as CEO/Managing Director at apt Group, leading European supplier of extruded, anodised and processed aluminium products, he was the VP Commercial, Global Commercial Transportation and Industrial in Alcoa. See all articles by Hans-Bernd Schäfer Hans-Bernd Schäfer. Schaefer, Hans-Bernd and Fehling, Michael, Privatization of the Police (December 13, ). Sehen Sie sich das Profil von Bernd Schäfer im größten Business-Netzwerk der Welt an. Im Profil von Bernd Schäfer sind 7 Jobs angegeben. Auf LinkedIn können Sie sich das vollständige Profil ansehen und mehr über die Kontakte von Bernd Schäfer und Jobs bei ähnlichen Unternehmen erfahren. Bernd-michael Schäfer is on Facebook. Join Facebook to connect with Bernd-michael Schäfer and others you may know. Facebook gives people the power to share and makes the world more open and connected. Bernd Schaefer is a Senior Scholar with the Woodrow Wilson International Center’s Cold War International History Project (CWIHP) and a Professorial Lecturer at George Washington University in Washington D.C. He was a Visiting Professor with the University of North Korean Studies in Seoul, a Fellow at the Nobel Institute in Oslo, and a.
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Schäfer ist verheiratet und wohnte mit seiner Familie nun sex tube knapp 10 Jahre in Bergkamen-Mittebevor sie in Overberge bauten und dort wohnhaft wurden. You currently do not have any folders to save your paper to! Artikel verbessern Neuen Artikel anlegen Autorenportal Hilfe Letzte Änderungen Kontakt Spenden. Proceedings Article 12 July Proceedings Dirndel Porn 14 September Caused by the temperature dependence of the refractive index as well as thermal expansion, the initially plane wavefront of the test laser Jung und sexy Crystal Rae Knochen Brutal wecken POV clip distorted into a cylindrical shape, with bending ends towards the surface. Proceedings Article 12 April Design Thinking. Marcel Koch. Bernd Schäfer. In particular, the determination of Teen Porno Fotos and phase distribution at locations were measurement is difficult or even not feasible, e. Along with a description of the technique we present results from absorption measurements on coated and uncoated optics at various laser wavelengths ranging from deep UV to near IR.
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Artikel verbessern Neuen Artikel anlegen Autorenportal Hilfe Letzte Änderungen Kontakt Spenden. This allows for online adjustment of focusing optics such as ellipsoidal or Kirkpatrick-Baez mirrors minimizing the aberrations in the focused beam.

To gain highly resolved spatial coherence information, we have performed a caustic scan at beamline BL2 of the free-electron laser FLASH using the ellipsoidal focusing mirror and a movable EUV sensitized CCD detector.

This measurement allows for retrieving the Wigner distribution function, being the two-dimensional Fourier transform of the mutual intensity of the beam.

Computing the reconstruction on a four-dimensional grid, this yields the entire Wigner distribution which describes the beam propagation completely.

Hence, we are able to provide comprehensive information about spatial coherence properties of the FLASH beam including the global degree of coherence.

Additionally, we derive the beam propagation parameters such as Rayleigh length, waist diameter and M 2.

Proceedings Article 1 April Hartmann wavefront sensor for EUV radiation. Flöter , T. Mey , B. Schäfer , B. Keitel , E. Plönjes , K. KEYWORDS: Monochromatic aberrations, Mirrors, Sensors, Wavefront sensors, Wavefronts, Wave propagation, Extreme ultraviolet, Extreme ultraviolet lithography, Free electron lasers, EUV optics.

Primarily designed for optics adjustment and beam characterization of the free electron laser FLASH, the self-supporting device can also be used in combination with any other EUV radiation source, as e.

The device can be successfully employed for characterization of the unfocused FEL beam, as well as for fine-adjustment of EUV optics, as demonstrated for an ellipsoidal focusing mirror at beam-line BL2 of FLASH.

The wavefront monitored behind this mirror provided information on typical misalignment effects such as astigmatism or coma. Improved alignment allowed for reduction of the wavefront rms w rms from 3.

Tests performed with LPP EUV sources indicate that the new sensor can also be used for actinic optics characterization and real-time fine-tuning of EUVL optics systems.

Proceedings Article 4 December Separation of different loss channels in DUV optical elements. Klaus Mann , Uwe Leinhos , Julian Sudradjat , Bernd Schäfer.

KEYWORDS: Optical components, Deep ultraviolet, Silica, Calibration, Quartz, Wavefronts, Adaptive optics, Thermal effects, Excimer lasers, Absorption.

A photo-thermal measurement device for quantitative determination of absorptance in DUV optics was developed. It is based upon a Hartmann-Shack wavefront sensor with extreme sensitivity, accomplishing spatially resolved monitoring of thermally induced wavefront distortions.

Caused by the temperature dependence of the refractive index as well as thermal expansion, the initially plane wavefront of a test laser is distorted into a convex or concave lens, depending on sign and magnitude of index change and expansion.

Since the extent of deformation is directly proportional to the absorption loss, the parallelized photo-thermal technique can be employed for a rapid assessment of the material quality.

Monitoring the fluence dependence of the thermal lens effect accomplishes evaluation of both single- and two-photon absorption coefficients. Moreover, a separation of surface and bulk absorptance can be achieved.

Along with a description of the technique we present results from absorption measurements on fused silica and CaF 2 under nm irradiation.

The data are compared with theoretical results obtained from a solution of the heat diffusion equation. Proceedings Article 28 November Absolute measurement of absorptance in DUV optics from laser-induced wavefront deformations.

Mann , U. Leinhos , J. Sudradjat , B. KEYWORDS: Refractive index, Deep ultraviolet, Silica, Calibration, Wavefronts, Adaptive optics, Collimation, Laser beam diagnostics, Laser optics, Absorption.

A measurement system for quantitative determination of both surface and bulk contributions to the photo-thermal absorption in DUV optics was developed.

Caused by the temperature dependence of the refractive index as well as thermal expansion, the initially plane wavefront of the test laser is distorted into a cylindrical shape, with bending ends towards the surface.

Sign and magnitude depend on index change and expansion. By comparison with thermal theory, this transient wavefront distortion yields a quantitative absolute measure of bulk and surface absorption losses in the sample.

First results for fused silica are presented. Proceedings Article 21 May Beam characterization of FLASH from Hartmann data and measurement of the Wigner distribution function.

Bernd Schäfer , Bernhard Flöter , Klaus Mann , Barbara Keitel , Elke Plönjes , Kai Tiedtke. KEYWORDS: Mirrors, Sensors, Wavefront sensors, Wavefronts, Wavefront aberrations, Wave propagation, Extreme ultraviolet, CCD image sensors, Free electron lasers, Wigner distribution functions.

The wavefront as well as beam parameters of the free electron laser FLASH emitting in the EUV spectral range were determined from wavefront measurements using self supporting Hartmann sensors.

The devices were applied for alignment of the ellipsoidal focusing mirror at Beamline 2 BL2 , reducing the rms wavefront aberrations by more than a factor of 3.

Furthermore, two-dimensional single pulse intensity distributions were recorded at each of 32 axial positions, spaced app. From these beam profile data the Wigner distribution function was reconstructed on two dimensional orthogonal subspaces.

For separable beams this yields the complete Wigner distribution and gives comprehensive and high-resolution information on the propagation characteristics, including wavefront, mode content and spatial coherence.

The obtained results are compared to the Hartmann experiments. Proceedings Article 23 March Measurement of wavefront distortions in DUV optics due to lens heating.

Bayer , U. Leinhos , M. Schöneck , B. KEYWORDS: Refractive index, Deep ultraviolet, Silica, Sensors, Calibration, Wavefronts, Semiconductor lasers, Thermal effects, Wavefront distortions, Absorption.

Lens heating due to absorbed UV laser radiation can diminish the achievable spatial resolution of the lithographic process in semiconductor wafer steppers.

At the Laser Lab Göttingen a measurement system for quantitative registration of this thermal lens effect was developed.

It is based upon a strongly improved Hartmann-Shack wavefront sensor with extreme sensitivity, accomplishing precise on-line monitoring of wavefront deformations of a collimated test laser beam transmitted through the laser-irradiated site of a sample.

Caused by the temperature-dependent refractive index as well as thermal expansion, the formerly plane wavefront of the test laser is distorted to form a rotationally symmetric valley, being equivalent to a convex lens.

On the other hand, the photo-thermal technique can be employed for a rapid assessment of the material quality, since the extent of transient wavefront deformation is directly proportional to the absorption losses.

When used in orthogonal test geometry on cuboid samples, quantitative determination of both surface and bulk contributions to the overall absorption can be obtained by comparison with thermal theory.

Along with a description of the new technique we present photo-thermal measurements on various fused silica samples under nm irradiation.

The data are compared with theoretical results obtained from a semi-analytical solution of the heat diffusion equation.

Excellent agreement is achieved regarding both shape and extent of the lens heating effect. Proceedings Article 17 June Photothermal measurement of absorptance losses, temperature-induced wavefront deformation, and compaction in DUV optics.

Bernd Schäfer , Bernhard Flöter , Klaus Mann. KEYWORDS: Silica, Sensors, Calibration, Quartz, Laser development, Wavefronts, Adaptive optics, Wavefront distortions, Resistors, Absorption.

A measurement system for quantitative registration of transient and irreversible lens effects in DUV optics induced by absorbed UV laser radiation was developed at the Laser-Laboratorium Göttingen.

Caused by the temperature dependence of the refractive index as well as thermal expansion and compaction, the initially plane wavefront of the test laser is distorted into a convex or concave lens, dependent on sign and magnitude of index change and expansion.

The observed wavefront distortion yields a quantitative measure of the absorption losses in the sample. Some results for fused silica and CaF 2 are presented.

Proceedings Article 25 February Comprehensive laser beam characterization for applications in material processing.

Klaus Mann , Armin Bayer , Maik Lübbecke , Bernd Schäfer. KEYWORDS: Cameras, Sensors, Diagnostics, Wavefronts, Laser beam propagation, Near field, Wave propagation, Excimer lasers, Standards development, Laser beam characterization.

With ever more stringent requirements regarding the quality of laser-supported production processes, measuring techniques for comprehensive characterization of laser beams and beam delivery optics are rapidly gaining importance.

Of particular interest is precise knowledge regarding the beam profile, the beam propagation characteristics, and the wavefront. The latter describes the local direction of energy flux and carries detailed information about the beam aberrations, including intrinsic ones as well as those introduced by optical elements along the beam path.

In this paper we give an overview of the status and current developments in the field of laser beam characterization.

Examples from industrial applications are given, including the diagnostics of nm excimer lasers. Along with a description of measuring procedures according to ISO standards, emphasis is placed on diagnostics based on Hartmann-Shack wavefront sensors.

From the wavefront and the simultaneously recorded near-field profile beam parameters such as diameter, divergence, and M 2 can be evaluated in real-time.

In addition, the approach also accomplishes prediction of the propagation behavior of the radiation field. Proceedings Article 30 December Photothermal measurement of absorption and wavefront deformations in fused silica.

Bayer , J. Gloger , U. Leinhos , T. Rousseau , B. KEYWORDS: Deep ultraviolet, Silica, Quartz, Wavefront sensors, Wavefronts, Adaptive optics, Thermal effects, Excimer lasers, Wavefront distortions, Absorption.

The photo-thermal technique can be employed for a rapid assessment of the material quality, since the wavefront deformation is directly proportional to the absorption losses.

Along with a description of this new technique, we present results from photo-thermal measurements on fused silica under nm irradiation, as well as a comparison with thermal theory.

Proceedings Article 7 March

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