Zobrazeno 1 - 10
of 60
pro vyhledávání: '"Ulrich Wittrock"'
Autor:
Sven Verpoort, Andreas Grzesik, Pascal Hallibert, Maximilian Gerhards, Ulrich Wittrock, Maximilian Freudling, Markus Erhard, Sinje Leitz
Publikováno v:
International Conference on Space Optics — ICSO 2020.
This paper presents the results of the technology development project “Enabling Technologies for Piezo-Based Deformable Mirrors in Active Optics Correction Chains” conducted by OHB System AG together with its partner Munster University of Applied
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::416aec21a4d83000a79907edebb9df0d
https://doi.org/10.1117/12.2599467
https://doi.org/10.1117/12.2599467
Publikováno v:
Optics express. 29(4)
Cross-saturation of the gain media in intra-cavity pumped lasers leads to complex dynamics of the laser power. We present experimental results and a detailed theoretical analysis of this nonlinear dynamics for an intra-cavity pumped Yb:YAG thin-disk
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::91ebb7578abbc630ddc862bcd012e5fb
https://pubmed.ncbi.nlm.nih.gov/33726108
https://pubmed.ncbi.nlm.nih.gov/33726108
Autor:
Torben Fiehler, Ulrich Wittrock
Publikováno v:
EPJ Web of Conferences. 267:01053
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::543b8091a3cdcef0f3b9a687c9b9d6a6
https://doi.org/10.1051/epjconf/202226701053
https://doi.org/10.1051/epjconf/202226701053
Publikováno v:
Journal of the Optical Society of America. A, Optics, image science, and vision. 36(8)
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 abe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c302bb682a5ebf7782d85b41cf513f00
https://pubmed.ncbi.nlm.nih.gov/31503569
https://pubmed.ncbi.nlm.nih.gov/31503569
Publikováno v:
International Conference on Space Optics — ICSO 2018.
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 severel
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::be522f792171a161b821c13ae3183b4e
https://doi.org/10.1117/12.2536206
https://doi.org/10.1117/12.2536206
Autor:
Sebastian Schwung, Stefan Fischer, Patrick Pues, Ulrich Wittrock, Daniel Rytz, Michael Laube, Franziska Schröder, Torben Fiehler, Thomas Jüstel
Publikováno v:
Journal of Luminescence. 234:117987
This work deals with the spectroscopic properties of praseodymium doped single crystalline lutetium aluminum garnet (LuAG:Pr3+). A special focus was set on temperature- and time-dependent spectroscopy. Beyond the well-known down-conversion luminescen
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::eb1e73c121f5a47f4b836e2fecaa65e4
https://doi.org/10.1016/j.jlumin.2021.117987
https://doi.org/10.1016/j.jlumin.2021.117987
Publikováno v:
Applied Optics. 59:6959
On-the-fly remote laser processing plays an increasingly important role in modern fabrication techniques. These processes require guiding of the focus of a laser beam along the contours of the workpiece in three dimensions. State-of-the-art galvanome
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b12982e615af02294c320771fbf07fbf
https://doi.org/10.1364/ao.397495
https://doi.org/10.1364/ao.397495
Publikováno v:
Applied Optics. 59:5625
We recently presented a novel unimorph deformable mirror which allows for dynamic focus shift with an actuation rate of 2 kHz. Such mirrors suffer from hysteresis and creep. Therefore, they have to be operated in closed-loop. For this purpose, we dev
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1d9b81c5fc77942ef58cee6144f9e9c4
https://doi.org/10.1364/ao.392970
https://doi.org/10.1364/ao.392970
Publikováno v:
Optical Instrument Science, Technology, and Applications.
Active optics is an enabling technology for future large space telescopes. Image-based wavefront control uses an image-sharpness metric to evaluate the optical performance. A control algorithm iteratively adapts a corrective element to maximize this
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fe4ac51dcf311d3d7bb64e5e163b80ac
https://doi.org/10.1117/12.2312523
https://doi.org/10.1117/12.2312523
Autor:
Gleb Vdovin, Sven Verpoort, Michel Verhaegen, Orestis Kazasidis, Oleg Soloviev, Ulrich Wittrock
Publikováno v:
Optics Express, 26(21)
With a view to the next generation of large space telescopes, we investigate guide-starfree, image-based aberration correction using a unimorph deformable mirror in a plane conjugate to the primary mirror.We designed and built a high-resolution imagi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ac5e24c744104b40b20bbe5e8323a1ad
http://resolver.tudelft.nl/uuid:45660959-10b5-471c-a281-a8ceed4a284f
http://resolver.tudelft.nl/uuid:45660959-10b5-471c-a281-a8ceed4a284f
