@article{HeideckeHoelscher2012,
  author    = {Heidecke, Claus-Dieter and H{\"o}lscher, Uvo M.},
  title     = {Defizite in der Patientensicherheit.},
  series = {Deutsche Zeitschrift f{\"u}r klinische Forschung: DKZF},
  volume    = {2012},
  journal   = {Deutsche Zeitschrift f{\"u}r klinische Forschung: DKZF},
  number    = {3/4},
  publisher = {Geelen \& Geelen},
  issn      = {1616-0347},
  doi       = {10.25974/fhms-552},
  url       = {http://nbn-resolving.de/urn:nbn:de:hbz:836-opus-5528},
  pages     = {104 -- 105},
  year      = {2012},
  abstract  = {Mit der Anwendung von Medizinprodukten k{\"o}nnen Gefahren f{\"u}r Patient und Chirurg entstehen. Um diese zu minimieren, braucht es eine gemeinsame Anstrengung von Gesundheitseinrichtungen, dem Gesetzgeber und der Institutionen zur Forschungsf{\"o}rderung.},
  language  = {de}
}
@techreport{LaurigMuellerArneckeHoelscher2008,
  author    = {Laurig, W. and M{\"u}ller-Arnecke, H. W. and H{\"o}lscher, U.},
  title     = {Prinzipl{\"o}sungen zur ergonomischen Gestaltung von Medizinger{\"a}ten},
  publisher = {Bundesanstalt f{\"u}r Arbeitsschutz und Arbeitsmedizin},
  doi       = {10.25974/fhms-554},
  url       = {http://nbn-resolving.de/urn:nbn:de:hbz:836-opus-5544},
  year      = {2008},
  abstract  = {Die Forderungen des Arbeitsschutzgesetzes zur Beurteilung von Arbeitsbedingungen werden im Gesundheitswesen und speziell in den Krankenh{\"a}usern durch das Medizinproduktegesetz insofern erg{\"a}nzt, als damit eine Gef{\"a}hrdung von Sicherheit und Gesundheit von Patienten, Anwendern oder Dritten durch den Einsatz von Medizinprodukten vermieden werden soll. Gesetze, Richtlinien und Verordnungen sowie Normen f{\"u}r den Medizintechnikmarkt fordern dazu die Entwicklung und Anwendung gebrauchstauglicher Medizinprodukte durch verzahnte Ergonomieprozesse bei Herstellern und Leistungserbringern. Mit der vorliegenden Studie sollen diese Ergonomieprozesse durch Informationen, Handlungsanleitungen, Gestaltungsvorschl{\"a}gen und Pr{\"u}fschemata in Bezug auf Medizinprodukte unterst{\"u}tzt werden. Dazu wird die Qualit{\"a}t von besonderen Aspekten dieser Ergonomieprozesse durch Auswertung von gemeldeten Vorkommnissen mit Medizinprodukten und unter betrieblichen Bedingungen durch Feldstudien in Krankenh{\"a}usern untersucht.},
  language  = {de}
}
@article{KuhnAKolipPHoelscherUMetal.2013,
  author    = {Kuhn A, and Kolip P, and H{\"o}lscher UM, and Gocke M, and Maschewsky-Schneider U, and Sew{\"o}ster D, and Zeeb H,},
  title     = {Gesundheitsziele.de: Selection of a new health target for Germany},
  year      = {2013},
  abstract  = {Selection of a new health target for Germany},
  language  = {de}
}
@article{PerchermeierWittrock2013,
  author    = {Perchermeier, Julian and Wittrock, Ulrich},
  title     = {Precise measurements of the thermo-optical aberrations of an Yb:YAG thin-disk laser},
  series = {Opt. Lett.},
  volume    = {38},
  journal   = {Opt. Lett.},
  publisher = {OSA},
  doi       = {10.25974/fhms-685},
  url       = {http://nbn-resolving.de/urn:nbn:de:hbz:836-opus-6854},
  pages     = {2422 -- 2424},
  year      = {2013},
  abstract  = {We report on interferometric measurements of the thermo-optical aberrations of the laser medium of an Yb:YAG thin-disk laser in pumped and cw lasing conditions at several pump-power levels with a mean repeatability of 5 nm. These measurements build the basis for future intracavity compensation of the aberrations with our deformable mirror in order to improve the fundamental-mode efficiency.},
  language  = {en}
}
@article{HeuckNeumayerKuehletal.2006,
  author    = {Heuck, Hans-Martin and Neumayer, Paul and K{\"u}hl, Thomas and Wittrock, Ulrich},
  title     = {Chromatic aberration in petawatt-class lasers},
  series = {Appl. Phys. B},
  volume    = {84},
  journal   = {Appl. Phys. B},
  publisher = {Springer},
  doi       = {10.25974/fhms-652},
  url       = {http://nbn-resolving.de/urn:nbn:de:hbz:836-opus-6523},
  pages     = {421 -- 428},
  year      = {2006},
  abstract  = {In order to avoid optical damage and non-linear effects, high-power, high-energy lasers of the petawatt class like PHELIX (petawatt high-energy laser for heavy-ion experiments) use large-aperture optics. Usually, chromatic aberration associated with these optical elements is neglected. By means of numerical simulations, we show how the chromatic aberration affects the focal intensity pattern. In particular, we make quantitative predictions of how chromatic aberration decreases the focused peak intensity. Furthermore, we prove the feasibility of a new interferometer that measures the temporal pulse front distortions which arise from expansion telescopes. We also propose a scheme that pre-compensates these distortions.},
  language  = {en}
}
@inproceedings{WittrockWelp2006,
  author    = {Wittrock, Ulrich and Welp, Petra},
  title     = {Adaptive laser resonator control with deformable MOEMS mirrors},
  series = {MEMS/MOEMS Components and Their Applications III, Proc. SPIE},
  volume    = {6113},
  booktitle = {MEMS/MOEMS Components and Their Applications III, Proc. SPIE},
  publisher = {SPIE},
  doi       = {10.25974/fhms-653},
  url       = {http://nbn-resolving.de/urn:nbn:de:hbz:836-opus-6537},
  pages     = {61130C},
  year      = {2006},
  abstract  = {Adaptive laser resonators with deformable MOEMS mirrors under closed-loop control are discussed and experimental results are presented. The requirements for deformable mirrors and for closed-loop control systems of these mirrors are analyzed. Several deformable mirrors have been characterized and the results are presented. Currently available membrane mirrors deform under laser load and need further development before they can be used for aberration correction of solid state lasers above some tens of Watts. Nevertheless, the results are encouraging and the requirements are within reach of currently available technology. Finally, we demonstrate an Nd.YVO4-laser with a closed-loop adaptive resonator and more than 6 W of output power. The closed-loop system was able to compensate artificially introduced aberrations from a phase plate.},
  language  = {de}
}
@article{AlbersWittrock2011,
  author    = {Albers, Klaus and Wittrock, Ulrich},
  title     = {Optical pump concepts for highly efficient quasi-three-level lasers},
  series = {Appl. Phys. B},
  volume    = {105},
  journal   = {Appl. Phys. B},
  publisher = {Springer},
  doi       = {10.25974/fhms-646},
  url       = {http://nbn-resolving.de/urn:nbn:de:hbz:836-opus-6467},
  pages     = {245 -- 254},
  year      = {2011},
  abstract  = {Efficient quasi-three-level laser operation requires the generation of the highest possible pump rate from a given pump source. We derive the fundamental scaling laws for the pump rate and we extract optimization criteria for pump concepts from these laws. The analysis is then applied to the thin-disk laser. Based on the results, a novel pump concept for thin-disk lasers is proposed, which allows for several tens of pump beam passes and reduces the optical complexity of conventional pump concepts. Furthermore, the beam quality of the pump source is preserved almost completely, facilitating the highest possible pump rate.},
  language  = {en}
}
@inproceedings{VerpoortWittrock2011,
  author    = {Verpoort, Sven and Wittrock, Ulrich},
  title     = {Novel unimorph deformable mirror with monolithic tip-tilt functionality for solid state lasers},
  series = {MEMS Adaptive Optics V, Proc. SPIE},
  volume    = {7931},
  booktitle = {MEMS Adaptive Optics V, Proc. SPIE},
  publisher = {SPIE},
  doi       = {10.25974/fhms-647},
  url       = {http://nbn-resolving.de/urn:nbn:de:hbz:836-opus-6471},
  pages     = {793107},
  year      = {2011},
  abstract  = {We present a new type of unimorph deformable mirror with monolithic tip-tilt functionality. The tip-tilt actuation is based on a spiral arm design. The mirror will be used in high-power laser resonators for real-time intracavity phase control. The additional tip-tilt correction with a stroke up to 6 μm simplifies the resonator alignment significantly. The mirror is optimized for a laser beam footprint of about 10 mm. We have modeled and optimized this mirror by finite element calculations and we will present design criteria and tradeoffs for this mirrors. The mirror is manufactured from a super-polished glass substrate with very low surface scattering and excellent dielectric coating.},
  language  = {en}
}
@inproceedings{VerpoortWittrock2010,
  author    = {Verpoort, Sven and Wittrock, Ulrich},
  title     = {Unimorph deformable mirror for telescopes and laser applications in space},
  series = {International Conference on Space Optics (ICSO), Rhodes Island, Greece},
  booktitle = {International Conference on Space Optics (ICSO), Rhodes Island, Greece},
  publisher = {SPIE},
  doi       = {10.25974/fhms-648},
  url       = {http://nbn-resolving.de/urn:nbn:de:hbz:836-opus-6484},
  year      = {2010},
  abstract  = {Over the past 5 years we have developed a new type of unimorph deformable mirror. The main advantages of this mirror technology are · very low surface scattering due to the use of superpolished glass · excellent coatings, even suitable for high power lasers, can be applied · active diameter of the mirrors can be between 10 mm and 100 mm · large strokes can be achieved even for small mirror diameters · integrated monolithic tip/tilt functionality based on a spiral arm design We have modeled these mirrors by analytical models as well as by the finite element method. This allows us to quickly design new mirrors tailored to specific applications. One example is a mirror for laser applications that has a diameter of 10 mm and can achieve a stroke in defocus mode of 5 μm. The stroke for these mirrors scales as the square of the mirror diameter, meaning that we can achieve, for example, a stroke of 125 μm for a mirror of 50 mm diameter. We will present design criteria and tradeoffs for these mirrors. We characterize our mirrors by the maximum stroke they can deliver for various Zernike modes, under the boundary condition that the Zernike mode has to be created with a certain fidelity, usually defined by the Mar{\´e}chal criterion.},
  language  = {en}
}
@article{VerpoortWittrock2010,
  author    = {Verpoort, Sven and Wittrock, Ulrich},
  title     = {Actuator patterns for unimorph and bimorph deformable mirrors},
  series = {Appl. Opt.},
  volume    = {49},
  journal   = {Appl. Opt.},
  publisher = {OSA},
  doi       = {10.25974/fhms-649},
  url       = {http://nbn-resolving.de/urn:nbn:de:hbz:836-opus-6490},
  pages     = {G37 -- G46},
  year      = {2010},
  abstract  = {The actuator pattern of an adaptive mirror determines the amplitudes and the fidelities of the mirror deformations that can be achieved. In this study, we analyze and compare different electrode patterns of piezoelectric unimorph deformable mirrors using a numerical finite element model. The analysis allows us to determine the optimum actuator pattern, and it is also applicable to bimorph mirrors. The model is verified by comparing its predictions with experimental results of our prototype of a novel unimorph deformable mirror.},
  language  = {de}
}