Ondrej Podrazky
Academy of Sciences of the Czech Republic
38 Papers
110 Citations
Ondrej Podrazky is an academic researcher from Academy of Sciences of the Czech Republic. The author has contributed to research in topics: Optical fiber & Fiber laser. The author has an hindex of 9, co-authored 35 publications.
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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.
Wideband thulium–holmium-doped fiber source with combined forward and backward amplified spontaneous emission at 1600–2300 nm spectral band
TL;DR: Two extremely wideband amplified spontaneous emission (ASE) sources are experimentally demonstrated by combining the backward and forward ASEs generated in thulium-holmium-doped fiber using appropriate wideband couplers.
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Fiber-optic pH detection in small volumes of biosamples
Ivan Kašík,Jan Mrázek,Tomas Martan,Marie Pospíšilová,Ondrej Podrazky,Vlastimil Matejec,Klára Hoyerová,Miroslav Kamínek +7 more
TL;DR: Novel V-taper sensing probes with a minimum diameter of around 8 μm were prepared that enable the delivery of fluorescence signal from the detection site on the taper tip to the detector and the results were validated by comparison with conventional electrochemical pH measurements.
Use of alumina nanoparticles for preparation of erbium-doped fibers
Ondrej Podrazky,Ivan Kašík,Marie Pospíšilová,Vlastimil Matejec +3 more
- 12 Nov 2007
TL;DR: In this article, it was found that optical fibers doped in the core with alumina nanoparticles and erbium ions have approx. three times lower attenuation than the fibers prepared from a solution of aluminium chloride by using the conventional solution-doping technique.
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Fiber-optic detection of chlorine in water
Ivan Kašík,Jan Mrázek,Ondrej Podrazky,Miroslav Seidl,Jan Aubrecht,Petr Tobiska,Marie Pospíšilová,Vlastimil Matejec,Barna Kovács,Ákos Markovics,Monika Szili +10 more
TL;DR: In this article, a commercially available absorption transducer o-phenylenediamine (o-PDA) was electrochemically immobilized onto fiber-optic substrates coated with Indium-Tin-Oxide (ITO).
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