Jan Mrázek, Ph.D.

Materials for students:

Student materials from lectures can be found here

Education:

2006 - 2011: Bilateral Czech-French PhD studies at Charles University, Faculty of Sciences and Universite de Rennes. Doctoral thesis: „Sol-gel synthesis of ternary Zn_xTi_yO_z nanostructures for applications in solar cell technologies and photonics” graduated in June 2011, received Ph.D. title

1996 - 2005: Institute of Chemical Technology, Prague - MSc degree, branch Material Engineering

Current projects:

Principal investigator of projects:

Member of projects:

Selected past projects:

Principal investigator of the projects:

• Colloidal diffuse sources for the technology of power semiconductor devices
• Preparation of fiber lasers with a core from transparent ceramics and their use for laser surface modification of materials
• Nanoparticle-doped soft-glass optical fibers for fiber-lasers
• Novel thulium-doped nanomaterials for active optical fibers

Member of projects:

• Novel optical fibers and their spectroscopy for fiber lasers operating beyond 2 um
• Synthesis, characterization and tailoring the properties of luminescent nanocomposites
• Novel silica-based Ho -doped nanomaterials for 2-μm-class fibre laser research
• Bragg fibers for delivery of high laser powers
• Preparation and properties of silica-based optical glasses containing rare-earth- and chromium-doped nano-particles
• III-V semiconductor heterostructures and nanostructures towards innovative electronic and photonic applications
• Role of the interface in the preparation of high quality Schottky barriers on III-V semiconductors
• Regulation of morphogenesis of plant cells and organs
• Thulium doped silica fibres for fibre amplifiers
• Novel approaches to reversible opto-electrochemical fibre sensing of chlorine in water
• Air-silica microstructure fibers for evanescent-wave chemical sensing

Utility models:

O.Podrazký, J.Mrázek, I.Kašík, L.Šašek, R.Schilhart: “Optický pH metr s mikroskopickou sondou”, Utility model CZ 30867 U1, registered 31 July 2017.

Publications:

Books:

1. J. Mrázek: “Sol-gel synthesis of ternary Zn-(x)-Ti-(y)-O-(z) nanostructures for solar cell technologies and photonics”, Synthesis and characterization of nanocrystalline zinc titanates, LAP Lambert Academic Publishing (2012), ISBN-13: 978-3-659-19110-7, book
2. Kašík, O. Podrazký, J. Mrázek, J. Aubrecht, V. Matějec: „Chlorine in water“, R. Mangione, D. Carlyle (Eds.): „Chlorine: Properties, applications and health effects“, Nova Science Publishers, Inc., 2011, book chapter

Journal papers:

1. V. Nečina, T. Uhlířová, L. Kotrbová, J. Mrázek, W. Pabst, “Thermal conductivity of Eu-doped  La2Zr2O7 transparent ceramics”, Journal of the European Ceramic Society, Volume 45, Issue 1, January 2025, 116821, Link 
2. P. Golonko, I. Kašík, J. Mrázek, J. Żmojda. Influence of ZnF2 concentration on excitation energy transfer between Er3+ and Tm3+ ions in antimony-germanate glass ceramic. PHOTONICS LETTERS OF POLAND, VOL. 16 (1), 4-6 (2024). Link 
3. P. Vařák, M. Kamrádek, J. Aubrecht, O. Podrazký, J. Mrázek, I. Bartoň, A. Michalcová, M. Franczyk, R. Buczyňski, I. Kašík, P. Petereka, P. Honzátko. Heat treatment and fiber drawing effect on the matrix structure and fluorescence lifetime of Er- and Tm-doped silica optical fibers. Vol. 14, No. 4 / 1 Apr 2024 / Optical Materials Express (2024). Link
4. O. Podrazký, J. Mrázek, P. Vařák, J. Proboštová, I. Bartoň, et al. Nanocrystalline ceramic coatings for the capillary fiber lasers. Proceedings Volume 12573, Specialty Optical Fibres; 125730X (2023). Link 
5. V. Puchý, P. Hvizdoš, M. Hrubovčáková, L. Falat, J. Mrázek, M. Vojtko, O. Milkovič, M. Podobová. Tribological behavior of spark plasma sintered and laser ablated SiC-graphene nanoplatelets composite. Ceramics International 49 (2023) 24332–24338. Link
6. Jan Mrázek, Soňa Kamrádková, Jiří Buršík, Roman Skála, Ivo Bartoň, Petr Vařák, Yauhen Baravets & Ondřej Podrazký. Nanocrystalline (HoxY1−x)2Ti2O7 luminophores for short- and mid-infrared lasers. Journal of Sol-Gel Science and Technology. ISSN: 0928-0707, eISSN: 1573-4846 (2023). Link
7. 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
8. 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
9. Mrázek, J., Bysakh, S., Skála, R., Mráček, A., Dhar, A., Bartoň, I., Kašík, I. Crystallization kinetics and structural properties of nanocrystalline europium-yttrium-titanate (Eu0.5Y0.5)2Ti2O7. Advanced Powder Technology 33, 103501 (2022). Link
10. O. Podrazký, J. Mrázek, J. Proboštová, S. Vytykáčová, I. Kašík, Š. Pitrová, Ali A. Jasim “Ex-Vivo Measurement of the pH in Aqueous Humor Samples by a Tapered Fiber-Optic Sensor,” Sensors, 21, 5075, (2021). Link
11. 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
12. 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.
13. 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.
14. 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
15. 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. 
16. I. Kašík, M. Kamrádek, J. Aubrecht, P. Peterka, O. Podrazký, J. Cajzl, J. Mrázek, P. Honzátko „Thulium-doped optical fibers for fiber lasers operating at around 2 µm“, BULLETIN OF THE POLISH ACADEMY OF SCIENCES TECHNICAL SCIENCES (2019). Link  
17. O. Podrazký, P. Peterka, I. Kašík, S. Vytykáčová, J. Proboštová, J. Mrázek, M. Kuneš, V. Závalová, V. Radochová, O. Lyutakov, E. Ceci-Ginistrelli, D. Pugliese, N. G. Boetti, D. Janner, D. Milanese: „In vivo testing of a bioresorbable phosphate‐based optical fiber“, Journal of Biophotonics (2019). Link 
18. J. Mrázek, S. Vytykáčová, J. Buršík, V. Puchy, V. Girman, P. Peterka, I. Kasik: „Sol-gel route to nanocrystalline Eu2Ti2O7 films with tailored structural and optical properties”, Journal of the American Ceramic Society (2019). Link
19. M. Surynek, L. Spanhel, L. Lapcik, J. Mrazek “Tuning the photocatalytic properties of sol–gel-derived single, coupled, and alloyed ZnO–TiO2 nanoparticles”, Research on Chemical Intermediates, Volume 45, Issue 8, pp 4193–4204. Link
20. Mrazek, J.; Aubrecht, J.; Todorov, F.; Bursik, J.; Puchy, V.; Dzunda, R.; Vytykacova, S.; Kasik, I., CO2 laser-assisted preparation of transparent Eu2Ti2O7 thin films. Ceram. Int. 2018, 44 (8), 9479-9483. link
21. Mrazek, J.; Bohacek, J.; Vytykacova, S.; Bursik, J.; Puchy, V.; Robert, D.; Kasik, I., Photolithographic patterning of nanocrystalline europium-titanate Eu2Ti2O7 thin films on silicon substrates. Mater. Lett. 2017, 209, 216-219. link
22. Vytykacova, S.; Mrazek, J.; Puchy, V.; Dzunda, R.; Skala, R.; Peterka, P.; Kasik, I., Sol-gel route to highly transparent (Ho0.05Y0.95)(2)Ti2O7 thin films for active optical components operating at 2 mu m. Opt. Mater. 2018, 78, 415-420. link
23. Kašík, I., Peterka, P., Mrázek, J., Honzátko, P. Silica optical fibers doped with nanoparticles for fiber lasers and broadband sources. Current Nanoscience. 2016, 12 (3), 277-290.
24. Vaisocherová-Lísalová, H., Víšová, I., Ermini, M., Špringer, T., Song, X., Mrázek, J., Lamačová, J., Scott Lynn, N., Šedivák, P., Homola, J. Low-fouling surface plasmon resonance biosensor for multi-step detection of foodborne bacterial pathogens in complex food samples. Biosensors and Bioelectronics. 2016, 80, 84-90. 
25. Turtos, R. M., Gundacker, S., Lucchini, M. T., Procházková, L., Čuba, V., Burešová, H., Mrázek, J., Nikl, M., Lecoq, P., Auffray, E. Timing performance of ZnO:Ga nanopowder composite scintillators. Physical Status Solidi RRL. 2016, 10 (11), 843–847.
26. Procházková, L., Čuba, V., Mrázek, J., Beitlerová, A., Jará, V., Nikl, M. Preparation of Zn(Cd)O: Ga-SiO2 composite scintillating materials. Radiation Measurements. 2016, 90, 59-63. 
27. Mrázek, J., Surýnek, M., Bakardjieva, S., Buršík, J., Proboštová, J., Kašík, I. Luminescence properties of nanocrystalline europium titanate Eu2Ti2O7. Journal of Alloys and Compounds. 2015, 645, 57-63. 
28. Mrázek, J., Potel, M., Buršík, J., Mráček, A., Kallistová, A., Jonášová, Š., Boháček, J., Kašík, I. Sol-gel synthesis and crystallization kinetics of dysprosium-titanate Dy2Ti2O7 for photonic applications. Materials Chemistry and Physics. 2015, 168, 159-167. 
29. Cui, Q., Podrazký, O., Mrázek, J., Proboštová, J., Kašík, I. Tapered-fiber optical sensor for physiological pH range. IEEE Sensors Journal, 2015, 15 (9), 4967-4973.
30. Mrázek, J., Surýnek, M., Bakardjieva, S., Buršík, J., Kašík, I. Synthesis and crystallization mechanism of europium-titanate Eu2Ti2O7. Journal of Crystal Growth. 2014, 391, 25-32. 
31. Mrázek, J., Kašík, I., Procházková, L., Čuba, V., Aubrecht, J., Cajzl, J., Podrazký, O., Peterka, P., Nikl, M. Active optical fibers doped with ceramic nanocrystals. Advances in Electrical and Electronic Engineering. 2014, 12 (6), 567-574.
32. Kašík, I., Podrazký, O., Mrázek, J., Cajzl, J., Aubrecht, J., Proboštová, J., Peterka, P., Honzátko, P., Dhar, A. Erbium and Al2O3 nanocrystals -doped silica optical fibers. Bulletin of the Polish Academy of Sciences, Technical Sciences. 2014, 62, 641-646. 
33. Podrazký, O., Matějec, V., Mrázek, J., Martan, T., Aubrecht, J., Kašík, I. Tapered optical fiber sensor for detection of pH in microscopic volumes. Sensors & Transducers. 2014, 27, 312-318.
34. Matějec, V., Bartoň, I., Mrázek, J., Podrazký, O. U-shaped fiber-optic detection elements for investigation of photocatalytic decomposition of toluene dissolved in water. Sensors & Transducers. 2014, 27, 244-252.
35. Kašík, I., Podrazký, O., Mrázek, J., Martan, T., Matějec, V., Hoyerová, K., Kamínek, M. In vivo optical detection of pH in microscopic tissue samples of Arabidopsis thaliana. Materials Science & Engineering C. 2013, 33 (8), 4809-4815.

Conference papers:

1. Flavio Esposito, Andrei Stancalie, Anubhav Srivastava, Mateusz Smietana, Jan Mrazek, Razvan Mihalcea, Constantin Daniel Negut, Stefania Campopiano, Agostino Iadicicco, Response of long period gratings written in B/Ge and P-doped optical fibers to gamma radiation, in: 2023: p. 126430A. doi 

2. 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

3. Mrázek, J.,  Vařák, P.,  Aubrecht, J.,  Vytykáčová, S., Baravets, Y., Kašík, I.  Nanocrystalline Ceramic Luminophores for Short- and Mid-Infrared. In: 2020 22nd International Conference on Transparent Optical Networks (ICTON). 2020, p. 1-4. 
4. Mrázek, J., Kašík, I., Aubrecht, J.,  Podrazký, O.,  Cajzl, J., Peterka, P.  Nanocrystalline Ceramic Phosphors for High-Power Lasers Operating at 2μm.  In: 21st International Conference on Transparent Optical Networks (ICTON). 2019, p. 1-4.
5. Puchý, V.,  Petryshynets, I., Kováč, F., Falat, L., Podobová, M., Mrázek, J., Vytykáčová, S. Influence of Fiber Laser Scribing on Magnetic Domains Structures and Magnetic Properties of NO Electrical Steel Sheets. In: Acta Physica Polonica A, Vol. 137, No. 5, 2020, p. 926-929.
6. Proboštová, J., Slánička, J., Mrázek, J., Podrazký, O., Benda, A., Peterka, P. Measurement of refractive index profile of non-symmetric, complex silica preforms with high refractive index differences. In: Micro-Structured and Specialty Optical Fibres IV (SPIE). 2016, 9886, p. 98861G-98861G-8.
7. Vytykáčová, S., Mrázek, J., Proboštová, J., Kašík, I. Optical properties of nanocrystalline (Ho0.05Y0.95)2Ti2O7 for optical amplifiers. In: Photonic Crystal Materials and Devices XII (SPIE). 2016, 9885, p. 98851F-98851F-7.
8. Podrazký, O., Mrázek, J., Vytykáčová, S., Proboštová, J., Kašík, I. Fiber-optic pH sensing system with microscopic spatial resolution. In: Optical Sensors 2015 (SPIE). 2015, 9506, p. 950612.
9. Mrázek, J., Kašík, I., Boháček, J., Proboštová, J., Aubrecht, J., Podrazký, O., Cajzl, J., Honzátko, P. Special optical fibers doped with nanocrystalline holmium-yttrium titanates (HoxY1-x)2Ti2O7 for fiber-lasers. In: Micro-structured and Specialty Optical Fibres IV (SPIE). 2015, 9507, p. 950703.
10. Cajzl, J., Peterka, P., Honzátko, P., Mrázek, J., Podrazký, O., Todorov, F., Gladkov, P., Sahu, J. K., Nunez-Valazquez, M., Nekvindová, P., Kašík, I. Characterization of fluorescence lifetime of Tm-doped fibers with increased quantum conversion efficiency. In: Photonics, Devices and Systems VI (SPIE). 2015, 9450, p. 9450171-9450178.
11. Bartoň, I., Matějec, V., Mrázek, J., Podrazký, O. Preparation and characterization of coatings with a high reflectivity on planar substrates and inside silica tubes. In: Photonics, Devices, and Systems VI (SPIE). 2015, 9450, p. 945019.
12. Mrázek, J., Nikl, M., Kašík, I., Podrazký, O., Aubrecht, J., Beitlerová, A. Nanoparticle-doped radioluminescent silica optical fibers. In: Optical Fibers and Their Applications (SPIE). 2014, 9228, p. 922805-1.
13. Cajzl, J., Podrazký, O., Mrázek, J., Aubrecht, J., Matějec, V., Peterka, P., Nekvindová, P., Kašík, I. The influence of nanostructured optical fiber core matrix on the optical properties of EDFA. In: Optics and Optoelectronics (SPIE).  2013, 8775, p. 8775-09.
14. Bobuskyy, V., Podrazký, O., Mrázek, J. Special optical fibers and fiber capillaries coated with Indium-Tin-Oxide. In: Optics and Optoelectronics (SPIE). 2013, 8775, p. 8775-0I.