Ivan Kašík, Ph.D.

Research interests:

Materials for the preparation of optical fibers, methods of preparation and characterization.

Professional activities:

- Member of European Optical Society, Czechoslovak Society for Photonics.

- Member of Czech Glass Society

- Board of the Institute Secretary

- Lecturer of Advanced Study Course on Optical Sensing (ASCOS), separate lectures for PhD-students of Institute of Chemical Technology (Physics and chemistry of glass and ceramic materials), for MS-students of Faculty of Electro-engineering CTU (Photonics, Optoelectronics, Optical fibers) and for MS-students of Nuclear Science and Engineering CTU (Optoelectronics).

2011 – today: Member of Council for Doctoral Studies at the Institute of Chemical Technology Prague

2003 - 2006 : Member of Scientific board of Institute of Photonics and Electronics, Academy of Sciences of the Czech Republic.

1995 - today: Senior research fellow, Institute of Photonics and Electronics, Academy of Sciences of the Czech Republic.

1993 - today: Institute of Photonics and Electronics of the Czech Academy of Sciences, Department of Technology of Optical Fibers, since 1996 scientific worker, since 2003 head of the department. Special optical fibres for fibre lasers and optical fiber sensors. Doped silica materials for optical fiber drawing, methods of their preparation (MCVD) and characterization.

Materials for students:

Student materials from lectures can be found here

Education:

1995: PhD, Institute of Chemical Technology, Prague, thesis ”Non-traditional Doping of High-silica Optical Fibers
1986: Ing. (MS degree equivalent), Institute of Chemical Technology, Prague, diploma ”Non-oxide Glasses of Ge-Se-Te Composition”

Current research projects:

Principal investigator of the projects:

• Novel optical fibers and their spectroscopy for fiber lasers operating beyond 2 um

Co-principal investigator of the projects:

• Synthesis, characterization and tailoring the properties of luminescent nanocomposites

Member of projects:

• Nanoparticle-doped soft-glass optical fibers for fiber-lasers
• European Action COST MP1401 Advanced fiber lasers
• Thulium fibre lasers for industrial and medical applications
• Fiber optic pH meter for microscopic biological samples

Selected past projects:

Principal investigator of the projects:

• Novel silica-based Ho -doped nanomaterials for 2-μm-class fibre laser research
• Tm-doped optical fibres for fibre lasers in 2 um spectral range
• Preparation and properties of silica-based optical glasses containing rare-earth- and chromium-doped nano-particles
• Novel approaches to reversible opto-electrochemical fibre sensing of chlorine in water
• Inverted graded-index fiber structures for evanescent-wave chemical sensing in the refractive-index
• Technologies of preparation of silica fibers with special refractive index profiles for chemical sensors

Co-principal investigator of the projects:

• Regulation of morphogenesis of plant cells and organs
• Quasi single-mode optical fibers for telecommunications and distributed fiber-optic sensors

Member of projects:

• eyesafe2u - Fiber optic components for "eye-safe" spectral region around 2 um
• Bragg fibers for delivery of high laser powers
• FILA - Compact high-power passively Q-switched all-fiber lasers
• scan4surf - Inline Process Metrology for Laser Structuring Systems (project of the European Micro and Nano Technology program MNT-ERA.net)
• Design, preparation and characterization of novel types of optical microresonators for chemical detection
• Optical fibers modified by nanostructured photocatalytic layers with high activity in visible spectrum
• Bend sensing with long-period gratings inscribed by CO2 laser in conventional and microstructure optical fibers of selected types
• Thulium doped silica fibres for fibre amplifiers
• Air-silica microstructure fibers for evanescent-wave chemical sensing
• Nonlinear effects in microstructure optical fibres and their potential applications for future communication systems
• Microstructure fibres for optical communications and sensors
• Novel organic-inorganic materials in optoelectronics systems for the monitoring and control of bio-processes
• Air-silica microstructure fibres: methods of fabrication and characterisation

Patents:

• P. Peterka, I. Kašík, V. Matějec: “Zařízení a způsob pro navázání signálu a čerpání do dvouplášťového optického vlákna”, CZ Pat. 301215.
• Pavel Peterka, Pavel Koska, Ondrej Podrazky, Vlastimil Matejec, Ivan Kasik, "Amplifying module, method of making the same, and cladding pumped optical device incorporating the module," CZ Pat. 305888, 9 March 2016.

Publications:

Book chapters:

1. 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
2. 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
3. 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
4. Jan Aubrecht, Pavel Peterka, Pavel Koška, Ondřej Podrazký, Filip Todorov, Pavel Honzátko, and Ivan Kašík, "Self-swept holmium fiber laser near 2100 nm," Opt. Express 25, 4120-4125 (2017)
5. 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
6. I. Kašík, V. Matějec, M Chomát: "Optical chemical sensors", Praha: PACI - Prazske analyticke centrum inovaci 2007, 169-185, skripta.
7. I. Kasik, V. Matejec, M. Chomat, M. Hayer, D. Berkova: ”Optical fibres for optical sensing“, Chapt. 4 in Optical Chemical sensors, Dordrecht: Springer, 2006, 59-76
8. V. Matějec, I. Kašík, M. Chomát : “Chapter 13: Fundamentals and performance of the MCVD aerosol process”, Aerosol chemical processes in the enviroment, Levis (2000)

Journal papers:

1. 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.  
2. 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. 
3. 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
4. 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
5. 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
6. 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.
7. Peterka, P., Honzátko, P., Koška, P., Todorov, F., Aubrecht, J., Podrazký, O., Kašík, I. Reflectivity of transient Bragg reflection gratings in fiber laser with laser-wavelength self-sweeping: Erratum. Optics Express. 2016, 24 (14), 16222-16223.
8. Koška, P., Peterka, P., Aubrecht, J., Podrazký, O., Todorov, F., Becker, M., Baravets, Y., Honzátko, P., Kašík, I. Enhanced pump absorption efficiency in coiled and twisted double-clad thulium-doped fibers. Optics Express. 2016, 24 (1), 102-107.
9. Sotor, J., Pawliszewska, M., Sobon, G., Kaczmarek, P., Przewolka, A., Pasternak, I., Cajzl, J., Peterka, P., Honzátko, P., Kašík, I., Strupinski, W., Abramski, K. All-fiber Ho-doped mode-locked oscillator based on a graphene saturable absorber. Optics Letters. 2016, 41, 2592-259.
10. Frank, M., Jelínek, M., Kubeček, V., Kašík, I., Podrazký, O., Matějec, V. Air and silica core Bragg fibers for radiation delivery in the wavelength range 0.6-1.5 um. Optical Fiber Technology. 2016, 31, 36-41.
11. J. Mrázek, M. Surýnek, S. Bakardjieva, J. Buršík, J. Proboštová, I. Kašík: “Luminescence properties of nanocrystalline europium titanate Eu2Ti2O7“, Journal of Alloys and Compounds. 2015, 645, 57-63
12. 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. 
13. Q. Cui, O. Podrazký, J. Mrázek, J. Proboštová, I. Kašík: “Tapered-fiber optical sensor for physiological pH range“IEEE Sensors Journal, 15 (9), (2015) 4967-4973
14. 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. 
15. J. Mrázek, I. Kašík, L. Procházková, V. Čuba, J. Aubrecht, J. Cajzl, O. Podrazký, P. Peterka, M. Nikl: „Active optical fibers doped with ceramic nanocrystals“, Advances in Electrical and Electronic Engineering 12 (2014) 567-574
16. P. Peterka, P. Honzátko, P. Koška, F. Todorov, J. Aubrecht, O. Podrazký, I. Kašík: „Reflectivity of transient Bragg reflection gratings in fiber laser with laser-wavelength self-sweeping“, Optics Express 22 (2014), 30024-30031
17. P. Honzátko, Y. Baravets, I. Kašík, O. Podrazký: „Wideband thulium-holmium-doped fiber source with combined forward and backward ASE at 1600-2300 nm spectral band“, Optics letters 39 (2014) 3650-3653
18. I. Kašík, O. Podrazký, J. Mrázek, J. Cajzl, J. Aubrecht, J. Proboštová, P. Peterka, P. Honzátko, A. Dhar: „Erbium and Al2O3 nanocrystals -doped silica optical fibers“, Bulletin of the Polish Academy of Sciences, Technical Sciences 62, 2014, 641-646
19. M. Szili, I. Kasik, V. Matejec, G. Nagy, B. Kovacs: „Poly(luminol) based sensor array for determination of dissolved chlorine in water“, Sensors and Actuators B-chemical 192 (2014) 92-98
20. M. Písařík, P. Peterka, S. Zvánovec, Y. Baravets, F. Todorov, I. Kašík,  P. Honzátko: „Fused fiber components for „eye-safe“ spectral region around 2 micrometers“, Optical and Quantum Electronics 46 (2014) 603-611
21. O. Podrazký, V. Matějec, J. Mrázek, T. Martan, J. Aubrecht, I. Kašík: „Tapered optical fiber sensor for detection of pH in microscopic volumes“, Sensors & Transducers 27 (2014) 312-318
22. J. Lorinčík, I. Kašík, J. Vaniš, L. Sedláček, J. Dluhoš: „Imaging of dopant distribution in optical fibers with an orthogonal TOF SIMS“, Surface and Interface Analysis 46 (2014) 238-240
23. T. Martan, J. Aubrecht, O. Podrazký, V. Matějec, I. Kašík: ”Detection of hydrocarbons using suspended core microstructured optical fiber”, Sensors and Actuators B-chemical 202 (2014) 123-128
24. Kasik, I., Podrazky, O., Mrazek, J., Martan T., Matejec V., Hoyerova K., Kaminek M., Local fibre-optic detection of pH in Arabidopsis thaliana plants, Mat. Sci. Eng. C 33 (2013) 4809-4815
25. P. Peterka, P. Honzátko, M. Becker, F. Todorov, M. Písařík, O. Podrazký, I. Kašík: “Monolithic Tm-doped fiber laser at 1951nm with deep-UV femtosecond-laser-induced FBG pair“, IEEE Photonics Technology Letters 25 (2013) 1623-1625
26. Dhar, A., I. Kašík, O. Podrazký, V. Matějec: “Fabrication and properties of Er-doped nanocrystalline phase-seperated optical fibers”, Advances in Electrical and Electronic Engineering 11 (2013) 29-35
27. Dhar, I. Kašík, B. Dussardier, O. Podrazký, V. Matějec: „Preparation and properties of Er–doped ZrO2 nanocrystalline phase-separated preforms of optical fibres by MCVD process“, Applied Ceramics Technology 9 (2012) 341-348

Conference papers:

1. J. Mrázek, M. Nikl, I. Kašík, O. Podrazký, J. Aubrecht, A. Beitlerová: “Nanoparticle-doped radioluminescent silica optical fibers“, Optical Fibers and Their Applications (SPIE) 9228, 2014, p. 922805-1
2. J. Mrázek, I. Kašík, J. Boháček, J. Proboštová, J. Aubrecht, O. Podrazký, J. Cajzl, P. Honzátko: „Special optical fibers doped with nanocrystalline holmium-yttrium titanates (HoxY1-x)2Ti2O7 for fiber-
3. 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“, Fiber Lasers XIV: Technology and Systems (SPIE), 10083, 2017, 100831V
4. 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", Proc. SPIE 10232, Micro-structured and Specialty Optical Fibres V, 2017, 1023205
5. P. Koška, P. Peterka, V. Doya, J. Aubrecht, I. Kasik, "Enhancement of pump absorption efficiency by bending and twisting of double clad rare earth doped fibers", Micro-structured and Specialty Optical Fibres V (Proc. SPIE), 102320E (June 9, 2017), invited oral presentation
6. Frank, M., Jelínek, M., Kubeček, V., Podrazký, O., Kašík, I., Matějec, V. Delivery of 1.9um laser radiation using air-core Bragg fibers. In: Wave and Quantum Aspects of Contemporary Optics (SPIE). 2016, 10142, p. 101421D-101421D-9.
7. Aubrecht, J., Peterka, P., Honzátko, P., Baravets, Y., Jelí¬nek, M., Kubeček, V., Pawliszewska, M., Sotor, J., Sobon, G., Abramski, K. M., Kašík, I. Characterization of holmium fibers with various concentrations for fiber laser applications around 2.1 um. In: Micro-Structured and Specialty Optical Fibres IV (SPIE). 2016, 9886, p. 988607-988607-7.
8. 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.
9. Peterka, P., Honzátko, P., Koška, P., Podrazký, O., Kašík, I. Transient-fiber-Bragg grating spectra in self-swept Fabry-Perot fiber lasers. In: Fiber Lasers XII: Technology, Systems, and Applications (SPIE). 2015, 9344, p. 934423.
10. 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.
11. Aubrecht, J., Cajzl, J., Peterka, P., Honzátko, P., Podrazký, O., Todorov, F., Kašík, I. Characterisation of double-clad thulium-doped fibers with increased quantum conversion efficiency. In: Micro-structured and Specialty Optical Fibres IV (SPIE). 2015, 9507, p. 95070P.
12. 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.
13. Matějec, V., Podrazký, O., Kašík, I., Frank, M., Jelínek, M., Kubeček, V. Transmission of red-laser radiation by using Bragg fibers with air cores. In: Micro-structured and Specialty Optical Fibres IV (SPIE). 2015, 9507, p. 95070Q-95070Q-7. 
14. 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.
15. Podrazký, O., Kašík, I., Peterka, P., Aubrecht, J., Cajzl, J., Proboštová, J., Matějec, V. Preparation of optical fibers with non-circular cross-section for fiber lasers and amplifiers. In: Photonics, Devices and Systems VI (SPIE). 2015, 9450, p. 94501A1-94501A6.
16. Matějec, V., Podrazký, O., Kašík, I., Frank, M., Jelínek, M., Kubeček, V. Comparison of characteristics of Bragg fibers with silica and air cores. In: Photonics, Devices and Systems VI (SPIE). 2015, 9450, p. 94500Y.
17. Peterka, P., Honzátko, P., Kašík, I., Cajzl, J., Podrazký, O. Thulium-doped optical fibers and components for fiber lasers in 2 μm spectral range. In: Wave and Quantum Aspects of Contemporary Optics (SPIE). 2014, 9441, p. 94410B1-94410B6.
18. Jelínek, M., Frank, M., Kubeček, V., Matějec, V., Kašík, I., Podrazký, O. Air core Bragg fibers for delivery of near-infrared laser radiation. In: The International Society for Optical Engineering (SPIE). 2014, 9441, p. 94411B.
19. 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.
20. 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.
21. Koška, P., Peterka, P., Kašík, I., Matějec, V., Podrazký, O. Double-clad rare-earth-doped fiber with cross-section tailored for splicing to the pump and signal fibers: analysis of pump propagation. In: Optics and Optoelectronics (SPIE). 2013, 8775, p. 8775-0V.
22. Matějec, V., Kašík, I., Podrazký, O., Aubrecht, J., Frank, M., Jelínek, M., Kubeček, V. Preparation and characterization of bragg fibers with air cores for transfer of laser radiation. In: Optics and Optoelectronics (SPIE). 2013, 8775, p. 8775-08.
23. Jelínek, M., Kubeček, V., Jelínková, H., Matějec, V., Kašík, I., Podrazký, O. Experimental investigation of high power picosecond 1.06 um pulse propagation in Bragg fibers. In: Nonlinear Optics and Applications (SPIE). 2013, 8772, p. 8772-1E.
24. Šiška, P., Látal, J., Koudelka, P., Vitásek, J., Kašík, I., Vašínek, V. Coupling conditions for quasi-single mode optical fibers with different refractive index profile. In:  Optical Sensors (SPIE). 2013, 8774, p. 87741T.
25. Peterka, P., Todorov, F., Kašík, I., Matějec, V., Podrazký, O., Šašek, L., Mallmann, G., Schmitt, R. Wideband and high-power light sources for in-line interferometric diagnostics of laser structuring systems. In: Wave and Quantum Aspects of Contemporary Optics ( SPIE). 2012, 8697, p. 869718.