TY  - JOUR
A1  - Schümmer, Andreas
A1  - Mertins, Hans-Christoph
A1  - Schneider, Claus Michael
A1  - Adam, Roman
A1  - Trellenkamp, S
A1  - Borowski, R
A1  - Juschkin, L
A1  - Berges, u
T1  - Fast and easy fabrication methodology of Fresnel zone plates for the extreme ultraviolet and soft x-ray regions
JF  - Applied Optics
Y1  - 2019
U6  - http://dx.doi.org/10.1364/AO.58.001057
VL  - 58
IS  - 4
SP  - 1057
EP  - 1063
ER  - 
TY  - JOUR
A1  - Klaus, Peikenkamp
T1  - Vergleich zweier Innenschuhdruckmesssohlen und Konsequenzen für die Praxis
JF  - Orthopädieschuhtechnik
Y1  - 2019
SN  - 0344-6026
VL  - 2019
IS  - 05
SP  - 18
EP  - 21
ER  - 
TY  - CHAP
A1  - Schümmer, A.
A1  - Mertins, H.-Ch.
A1  - Adam, R.
A1  - Schneider, C.M.
A1  - Bürgler, D.
A1  - Juschkin, L.
A1  - Berges, U.
T1  - A new scanning reflection x-ray microscope for magnetic imaging in the EUV range
T2  - Verhandlungen der DPG
Y1  - 2019
UR  - https://www.dpg-verhandlungen.de/year/2019/conference/regensburg/part/ma/session/44/contribution/5
VL  - 2019
ER  - 
TY  - CHAP
A1  - Kazasidis, Orestis
A1  - Verpoort, Sven
A1  - Wittrock, Ulrich
T1  - Image-based wavefront correction for space telescopes
T2  - International Conference on Space Optics - ICSO 2018
N2  - With a view to future large space telescopes, we investigate image-based wavefront correction with active optics. We use an image-sharpness metric as merit function to evaluate the image quality, and the Zernike modes as control variables. In severely aberrated systems, the Zernike modes are not orthogonal to each other with respect to this merit function. Using wavefront maps, the PSF, and the MTF, we discuss the physical causes for the non-orthogonality of the Zernike modes with respect to the merit function. We show that for combinations of Zernike modes with the same azimuthal order, a flatter wavefront in the central region of the aperture is more important than the RMS wavefront error across the full aperture for achieving a better merit function. The non-orthogonality of the Zernike modes with respect to the merit function should be taken into account when designing the algorithm for image-based wavefront correction, because it may slow down the process or lead to premature convergence.
KW  - active optics, adaptive optics, sharpness metrics, aberration compensation, algorithm design
Y1  - 2019
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:836-opus-109036
UR  - https://www.spiedigitallibrary.org/conference-proceedings-of-spie/11180/111807Z/Image-based-wavefront-correction-for-space-telescopes/10.1117/12.2536206.full?SSO=1
SP  - 111807Z
PB  - Proc. SPIE
ER  - 
TY  - JOUR
A1  - Hochmann, David
T1  - 3D-Druck in der Technischen Orthopädie – Stand und Perspektiven
JF  - Orthopädie-Technik
KW  - 3D-Druck, Technische Orthopädie
Y1  - 2019
SN  - 0340-5591
VL  - 70
IS  - 5
SP  - 18
EP  - 23
ER  - 
TY  - JOUR
A1  - Kazasidis, Orestis
A1  - Verpoort, Sven
A1  - Wittrock, Ulrich
T1  - Aberration balancing using an image-sharpness metric
JF  - J. Opt. Soc. Am. A
N2  - Image-sharpness metrics can be used to optimize optical systems and to control wavefront sensorless adaptive optics systems. We show that for an aberrated system, the numerical value of an image-sharpness metric can be improved by adding specific aberrations. The optimum amplitudes of the additional aberrations depend on the power spectral density of the spatial frequencies of the object.
KW  - adaptive optics; image-sharpness
Y1  - 2019
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:836-opus-109198
UR  - https://www.osapublishing.org/josaa/abstract.cfm?uri=josaa-36-8-1418
VL  - 36
IS  - 8
SP  - 1418
EP  - 1422
ER  - 
TY  - JOUR
A1  - Kanitz, A
A1  - Kalus, M-R
A1  - Gurevich, E L
A1  - Ostendorf, A
A1  - Barcikowski, S
A1  - Amans, D
T1  - Review on experimental and theoretical investigations of the early stage, femtoseconds to microseconds processes during laser ablation in liquid-phase for the synthesis of colloidal nanoparticles
JF  - Plasma Sources Sci. Technol.
Y1  - 2019
VL  - 28
SP  - 103001
EP  - 103001
ER  - 
TY  - JOUR
A1  - Dobbelstein, Henrik
A1  - Gurevich, Evgeny L.
A1  - George, Easo P.
A1  - Ostendorf, Andreas
A1  - Laplanche, Guillaume
T1  - Laser metal deposition of compositionally graded TiZrNbTa refractory high-entropy alloys using elemental powder blends
JF  - Additive Manufacturing
Y1  - 2019
U6  - http://dx.doi.org/10.1016/j.addma.2018.10.042
SN  - 2214-8604
VL  - 25
SP  - 252
EP  - 262
ER  - 
TY  - JOUR
A1  - Hoppius, Jan S.
A1  - Maragkaki, Stella
A1  - Kanitz, Alexander
A1  - Gregorčič, Peter
A1  - Gurevich, Evgeny L.
T1  - Optimization of femtosecond laser processing in liquids
JF  - Appl. Surf. Sci.
Y1  - 2019
U6  - http://dx.doi.org/10.1016/j.apsusc.2018.10.121
SN  - 0169-4332
VL  - 467-468
SP  - 255
EP  - 260
ER  - 
TY  - JOUR
A1  - Kanitz, Alexander
A1  - Förster, Daniel J.
A1  - Hoppius, Jan S.
A1  - Weber, Rudolf
A1  - Ostendorf, Andreas
A1  - Gurevich, Evgeny L.
T1  - Pump-probe microscopy of femtosecond laser ablation in air and liquids
JF  - Appl. Surf. Sci.
Y1  - 2019
SN  - 0169-4332
VL  - 475
SP  - 204
EP  - 210
ER  -