Michal Kamrádek, Ph.D.

Research interests:

Materials and methods for optical fibers preparation and their characterization.

Professional activities:

10/2016 – today: Institute of Photonics and Electronics of the Czech Academy of Sciences, Ph.D. student

01/2016 – 09/2016: Institute of Photonics and Electronics of the Czech Academy of Sciences, Research staff member

Education:

2016 – 2022: postgradual study at the Faculty of Nuclear Sciences and Physical Engineering at the Czech Technical University in Prague, Dissertation thesis: “Preparation and characterization of rare-earth-doped optical fibers for fiber lasers operating around 2 micrometers”

2010 – 2012: master’s study at the Institute of Chemical Technology in Prague, Diploma thesis: “The Influence of Chloride Ions on Electrocatalytical Activity of Conducting Polymer/Pt Composite”, graduated in June 2012, with honours, attained M.Sc. degree

2007 – 2010: Bachelor study at the Institute of Chemical Technology in Prague, Bachelor’s thesis: “The Kinetics of Reduction of Tetraamminecopper(II) Ion by Hydrazine and Hydroxylamine”, graduated in October 2010, with honours, attained B.Sc. degree

Current research projects:

Member of the projects:

• Novel nanostructured optical fibers for fiber lasers operating at dual wavelengths

Selected past projects:

• Research of novel geometries and layouts of double-clad rare-earth-doped fibers for high power fiber lasers
• Nanoparticle-doped soft-glass optical fibers for fiber-lasers
• Novel silica-based Ho -doped nanomaterials for 2-μm-class fibre laser research

Publications:

Journal papers

1. P. Vařák, M. Kamrádek, J. Mrázek, O. Podrazký, J. Aubrecht, P. Peterka, P. Nekvindová, I. Kašík. Luminescence and laser properties of RE-doped silica optical fibers: The role of composition, fabrication processing, and inter-ionic energy transfers. Optical Materials: X, Vol. 15, 100177 (2022). Link
2. P. Vařák, I. Kašík, P. Peterka, J. Aubrecht, J. Mrázek, M. Kamrádek, O. Podrazký, I. Bartoň, M. Franczyk, R. Buczynski, P. Honzátko. Heat treatment and fiber drawing effect on the luminescence properties of RE-doped optical fibers (RE = Yb, Tm, Ho). Optics Express Vol. 30, Issue 6, pp. 10050-10062 (2022). Link
3. P. Vařák, J. Mrázek, A. A. Jasim, S. Bysakh, A. Dhar, M. Kamrádek, O. Podrazký, I. Kašík, I. Bartoň, P. Nekvindová „Thermal stability and photoluminescence properties of RE-doped (RE = Ho, Er, Tm) alumina nanoparticles in bulk and fiber-optic silica glass,“ Optical Materials, Vol. 118, 111239, (2021). Link
4. M. Kamrádek, J. Aubrecht, P. Vařák, J. Cajzl, V. Kubeček, P. Honzátko, I. Kašík, P. Peterka “Energy transfer coefficients in thulium-doped silica fibers,” Optical Materials Express, Vol. 11, 1805, (2021). Link
5. A. A. Jasim, P. Peterka, O. Podrazký, M. Kamrádek, F. Todorov, P. Honzátko “Efficient approach to designing low OH diffusion in the thermally shaped double-clad fibers,” Optical Fiber Technology, Vol. 63, 102513, (2021). Link
6. F. Todorov, J. Aubrecht, P. Peterka, O. Schreiber, A. A. Jasim, J. Mrázek, O. Podrazký, M. Kamrádek, N. Kanagaraj, M. Grábner, Y. Baravets, J. Cajzl, P. Koška, A. Fišar, I. Kašík, P. Honzátko "Active Optical Fibers and Components for Fiber Lasers Emitting in the 2-μm Spectral Range", Materials, 13, 5177 (2020). Link.
7. P. Vařák, J. Mrázek, W. Blanc, J. Aubrecht, M. Kamrádek, O. Podrazký “Preparation and properties of Tm-doped SiO2-ZrO2 phase separated optical fibers for use in fiber lasers”, Optical Materials Express, Vol. 10, Issue 6 (2020). Link.
8. A. A. Jasim, O. Podrazký, P. Peterka, M. Kamrádek, I. Kašík, P. Honzátko “Impact of shaping optical fiber preforms based on grinding and a CO2 laser on the inner-cladding losses of shaped double-clad fibers”, Optics Express, Vol. 28, Issue 9, (2020). Link
9. J. Aubrecht, P. Peterka, P. Honzátko, O. Moravec, M. Kamrádek, I. Kašík “Broadband thulium-doped fiber ASE source”, Optics Letters, Vol. 45, No. 8 (2020). Link.
10. I. Kašík, Vl. Matějec, M. Hayer, M. Kamrádek, O. Podrazký, J. Mrázek, P. Peterka, P. Honzátko „Glass materials for optical fibers”, Ceramics-Silikáty 64 (1), 29-34 (2020). Link.
11. I. Kašík, V. Matějec, O. Podrazký, J. Mrázek, M. Kamrádek, P. Peterka, J. Aubrecht, F. Todorov, P. Honzátko, "Pokroky v oblasti optických vláken v ČR", Jemná mechanika a optika (2019). Link.
12. I. Kasik, M. Kamradek, J. Aubrecht, P. Peterka, O. Podrazky, J. Cajzl, J. Mrazek, P. Honzatko, "Thulium-doped optical fibers for fiber lasers operating around 2 µm", B. Pol. Acad. Sci-tech. (2019). Link.
13. M. Kamrádek, I. Kašík, J. Aubrecht, J. Mrázek, O. Podrazký, J. Cajzl, P. Vařák, V. Kubeček, P. Peterka, P. Honzátko, "Nanoparticle and solution doping for efficient holmium fiber lasers", IEEE Photonics Journal (2019). Link.
14. K. Nithyanandan, A. Theodosiou, J. Aubrecht, P. Peterka, M. Kamrádek, K. Kalli, I. Kašík, P. Honzátko, "All fiber mode-locked thulium-doped fiber laser using a novel femtosecond-laser-inscribed 45°-plane-by-plane-tilted fiber grating", Laser Phys. Lett. 16, 095104 (2019). Link.

Conference papers

1. P. Vařák, J. Mrázek, W. Blanc, J. Aubrecht, M. Kamrádek, O. Podrazký, P. Honzátko, "Nanocrystalline ZrO2-doped active optical fibers for fiber lasers operating at 2 μm," Proc. SPIE 11773, Micro-structured and Specialty Optical Fibres VII, 1177317 (18 April 2021); doi: 10.1117/12.2589127

2. M. Kamrádek, I. Kašík, J. Aubrecht, J. Mrázek, O. Podrazký, J. Cajzl, P. Vařák, P. Peterka, P. Honzátko, "Holmiem dopované vláknové lasery", Laser 59 (2019).
3. P. Peterka, P. Koška, A. Jasim, N. Kanagaraj, J. Aubrecht, M. Kamrádek, O. Podrazký, F. Todorov, I. Kašík and P. Honzátko, "Enhanced pump absorption efficiency in coiled and twisted double-clad fibers for fiber lasers", International Conference on Transparent Optical Networks, Angers, France (2019). 
4. A. A. Jasim, J. Aubrecht, P. Peterka, M. Kamrádek, O. Podrazký, F. Todorov, I. Kašík and P. Honzátko, "Efficient Pump Absorption in Twisted Double Clad Thulium-Doped Fibers Drawn of CO2 Laser Shaped Preform", CLEO Europe, Munich, Germany (2019). 
5. M. Kamradek, I. Kasik, P. Peterka, J. Aubrecht, P. Honzatko, O. Podrazky, J. Mrazek, V. Kubecek, "Silica- and germanate-based glasses doped with rare-earth elements for photonics devices", International Glass Congress, Boston, USA (2019).
6. M. Kamrádek, J. Aubrecht, P. Peterka, O. Podrazký, P. Honzátko, J. Cajzl, J. Mrázek, V. Kubeček, I. Kašík, "Spectroscopic characterization of holmium-doped optical fibers for fiber lasers“, SPIE Optics + Optoelectronics, Prague, Czech Republic (2019). Link.
7. I. Kašík, M. Kamradek, P. Peterka, J. Aubrecht, P. Honzatko, O. Podrazky, J. Mrazek, V. Kubecek, "Silica and germanate-based rare-earth doped glasses for fiber lasers", SPIE Optics + Optoelectronics, Prague, Czech Republic (2019).
8. J. Aubrecht, P. Peterka, P. Honzátko, O. Moravec, M. Kamrádek, I. Kašík: "Broadband ASE sources with flat output spectra without internal spectral flattening filter", Europhoton, Barcelona, Spain (2018).
9. M. Kamrádek, I. Kašík, P. Peterka, J. Aubrecht, O. Podrazký, P. Honzátko, J. Mrázek, V. Kubeček, "Silica- and germanate-based rare earth doped glasses for fiber lasers", SPIE Photonics Europe, Strasbourg, France (2018). Link.
10. M. Kamrádek, J. Aubrecht, P. Peterka, O. Podrazký, P. Honzátko, J. Cajzl, J. Mrázek, V. Kubeček, I. Kašík, "Spectroscopic study of silica optical fibers doped with holmium and thulium", International Glass Congress, Istanbul, Turkey (2017).
11. J. Mrázek, I. Kašík, M. Kamrádek, J. Aubrecht, O. Podrazký, I. Bartoň, V. Matějec, P. Peterka, "Sol-gel route to holmium-doped SiO2-GeO2 glasses for photonic applications", International Glass Congress, Istanbul, Turkey (2017).
12. M. Kamrádek, J. Aubrecht, P. Peterka, O. Podrazký, P. Honzátko, J. Cajzl, J. Mrázek, V. Kubeček, I. Kašík, "Thulium-doped optical fibers for fiber lasers", Photonics Prague, Prague, Czech Republic (2017). Link.
13. J. Aubrecht, P. Peterka, P. Honzátko, F. Todorov, O. Podrazký, M. Kamrádek, J. Proboštová, I. Kašík, "Monolithic thulium-doped fiber laser", Photonics Prague, Prague, Czech Republic (2017). Link.
14. J. Cajzl, P. Peterka, P. Honzátko, O. Podrazký, M. Kamrádek, J. Aubrecht, J. Proboštová, I. Kašík, "Evaluation of energy transfer coefficients in Tm-doped fibers for fiber lasers", Photonics Prague, Prague, Czech Republic (2017). Link.
15. M. Kamrádek, J. Aubrecht, P. Peterka, O. Podrazký, P. Honzátko, J. Cajzl, J. Mrázek, V. Kubeček, I. Kašík, "Advanced photonic glasses doped with thulium or holmium", Slovak and Czech Glass Conference, Trenčianské Teplice, Slovakia (2017).
16. M. Kamrádek, J. Aubrecht, P. Peterka, O. Podrazký, P. Honzátko, J. Cajzl, J. Mrázek, V. Kubeček and I. Kašík, "Spectral properties of thulium doped optical fibers for fiber lasers around 2 micrometers", SPIE Optics + Optoelectronics, Prague, Czech Republic (2017). Link.
17. J. Aubrecht, P. Peterka, P. Koška, P. Honzátko, M. Jelínek, M. Kamrádek, M. Frank, V. Kubeček, I. Kašík, "Spontaneous laser-line sweeping in Ho-doped fiber laser", SPIE LASE, San Francisco, USA (2017). Link.
18. J. Mrázek, I. Kašík, P. Peterka, J. Aubrecht, O. Podrazký, M. Kamrádek, J. Proboštová: "Ceramic-nanoparticles-doped active fibers for fiber lasers", Conference on Optical Fibers and Their Applications, Suprasl, Poland (2017).
19. I. Kašík, J. Aubrecht, P. Peterka, O. Podrazký, J. Cajzl, J. Mrázek, P. Honzátko, J. Proboštová, M. Kamrádek, "Influence of RE3+ vicinity on luminescence properties of silica-based materials for lasers operating around 2 μm", Laser Ceramic Symposium, Saint-Louis, France (2016).