Michal Kamrádek
Academy of Sciences of the Czech Republic
51 Papers
40 Citations
Michal Kamrádek is an academic researcher from Academy of Sciences of the Czech Republic. The author has contributed to research in topics: Fiber laser & Optical fiber. The author has an hindex of 5, co-authored 25 publications. Previous affiliations of Michal Kamrádek include Czech Technical University in Prague.
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Papers
Nanoparticle and Solution Doping for Efficient Holmium Fiber Lasers
Michal Kamrádek,Pavel Honzatko,Ivan Kašík,Jan Aubrecht,Jan Mrázek,Ondrej Podrazky,Jakub Cajzl,Petr Varak,Václav Kubeček,Pavel Peterka +9 more
TL;DR: In this paper, a set of 15 fibers with various compositions was characterized and compared with respect to their fluorescence lifetime, laser slope efficiency and laser threshold, and the best performance fibers exhibited slope efficiency 83.1%, laser threshold 155 mW and a record value of upper laser level lifetime of 1.35 ms.
Active Optical Fibers and Components for Fiber Lasers Emitting in the 2-μm Spectral Range.
Filip Todorov,Jan Aubrecht,Pavel Peterka,Ondřej Schreiber,Ondřej Schreiber,Ali Abdulhadi Jasim,Jan Mrázek,Ondřej Podrazký,Michal Kamrádek,Nithyanandan Kanagaraj,Nithyanandan Kanagaraj,Martin Grábner,Yauhen Baravets,Jakub Cajzl,Pavel Koška,Adam Fišar,Ivan Kašík,Pavel Honzatko +17 more
TL;DR: The first results of improvement of pump absorption in double-clad fibers thanks to the fiber twist frozen during drawing are presented and a brief demonstration of material processing by thulium all-fiber laser operating at 2 µm is presented.
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Luminescence and laser properties of RE-doped silica optical fibers: The role of composition, fabrication processing, and inter-ionic energy transfers
Petr Varak,Michal Kamrádek,Jan Mrázek,Ondřej Podrazký,Jan Aubrecht,Pavel Peterka,Pavla Nekvindova,Ivan Kašík +7 more
TL;DR: In this paper , the authors summarize the basic concepts and recent developments in the role of various co-dopants of rare earth ions, the fabrication processes used in the making of high-silica fibers and the inter-ionic energy-transfers, with respect to their influence on the luminescence and laser properties of the fibers.
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Thermal stability and photoluminescence properties of RE-doped (RE = Ho, Er, Tm) alumina nanoparticles in bulk and fiber-optic silica glass
Petr Vařák,Petr Vařák,Jan Mrázek,Ali Abdulhadi Jasim,S. Bysakh,Anirban Dhar,Michal Kamrádek,Ondřej Podrazký,Ivan Kašík,Ivo Bartoň,Pavla Nekvindova +10 more
TL;DR: In this paper, the thermal stability and photoluminescence properties of RE-doped (RE = Ho, Er, Tm) alumina nanoparticles in the phase system Al2O3-SiO2 with respect to the chemical composition and the thermal processing conditions applied in the fiber-optic technology were analyzed.
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Energy transfer coefficients in thulium-doped silica fibers
Michal Kamrádek,Jan Aubrecht,Petr Vařák,Jakub Cajzl,Václav Kubeček,Pavel Honzatko,Ivan Kašík,Pavel Peterka +7 more
TL;DR: In this paper, the energy transfer coefficients in thulium-doped silica fibers are determined by comparing experimental values and rate-equation-based modeling of the fluorescence decays.
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