Filip Todorov, Ph.D.

Research interests:

Technological applications of fiber lasers,
Long-period fiber gratings.

Professional activities:

2006 - today: Institute of Photonics and Electronics, Czech Academy of Sciences:

2005-2007: Department of Manufacturing Technology, Faculty of Mechanical Engineering, Czech Technical University in Prague:
- research staff

Education:

2010: Doctoral study at Faculty of Mechanical Engineering, Czech Technical University in Prague,

Doctoral thesis: „The use of laser technology in the development of fiber optic sensors“ 

2003: Faculty of Mechanical Engineering, Czech Technical University in Prague, Ph.D. degree

Awards:

2010: Member of the Czech Science Foundation awarded project (Active tunable all-fiber components based on fiber long period gratings, principal investigator: Dr. Radan Slavík)

Current projects:

Member of projects:

Selected past projects:

Member of projects:

• Thulium fibre lasers for industrial and medical applications
• Diffractive optical elements for high power fiber lasers
• Mid-Infrared Radiation Generation, Delivery and Applications
• European Action COST MP1401 Advanced fiber lasers
• eyesafe2u - eyesafe2u - Fiber optic components for "eye-safe" spectral region around 2 um
• Widely tunable source in the mid-infrared spectroscopy and metrology 
• 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
• Active tunable all-fiber components based on fiber long period gratings
• Bend sensing with long-period gratings inscribed by CO2 laser in conventional and microstructure optical fibers of selected types
• Ultra-short pulse shaping using long-period fiber gratings
• Long-period gratings in singlemode detection fibers for refractive-index sensing prepared by CO2 laser exposure

Publications:

Journal papers:

1. A. Theodosiou, J. Aubrecht, P. Peterka, I. Kasik, F. Todorov, O. Moravec, P. Honzatko, K. Kalli, "Er/Yb double-clad fibre laser with fs-laser inscribed plane-by-plane chirped FBG laser mirrors," IEEE Photonics Technology Letters, vol. 31, issue 5, pp. 409-412
2. Y. Baravets, P. Dvořák, F. Todorov, J. Čtyroký, P. Peterka, P. Honzátko „Broadly tunable laser based on novel metallic resonant leaky-mode diffraction grating”, Optics Express 4340, Vol. 28 (2020). 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. Aubrecht, J.; Peterka, P.; Koška, P.; Podrazký, O.; Todorov, F.; Honzátko, P.; Kašík, I. „Self-swept holmium fiber laser near 2100 nm“, OPTICS EXPRESS 25 (4): 4120-4125 (2017); doi: 10.1364/OE.25.004120
5. Peterka, P.; Honzátko, P.; Koška, P.; Todorov, F.; Aubrecht, J.; Navrátil, P.; Podrazký, O.; Kašík, I.; Čtyroký, J. „Braggovské mřížky ve vláknových laserech se spontánním rozmítáním vlnové délky“, JEMNÁ MECHANIKA A OPTIKA 62 (4): 108-114 (in czech) (2017), ISSN 0447-6441.
6. Vaněk, M.; Vaniš, J.; Baravets, Y.; Todorov, F.; Čtyroký, J.; Honzátko, P. „High-power fiber laser with a polarizing diffraction grating milled on the facet of an optical fiber“, OPTICS EXPRESS 24 (26): 30225-30233 (2016) ; doi: 10.1364/OE.24.030225
7. Písařík, M.; Peterka, P.; Aubrecht, J.; Cajzl, J.; Benda, A.; Mareš D.; Todorov, F.; Podrazký, O.; Honzátko, P.; Kašík, I. „Thulium-doped fibre broadband source for spectral region near 2 micrometers“, OPTO-ELECTRONICS REVIEW 24 (4): 223-231 (2016) ; doi: 10.1515/oere-2016-0022
8. 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 24 (14): 16222-16223 (2016); doi: 10.1364/OE.24.016212
9. Baravets, Y.; Honzátko, P.; Todorov, F.; Gladkov, P. „Narrowband widely tunable CW mid-infrared generator based on difference frequency generation in periodically poled KTP and KTA crystals“, OPTICAL AND QUANTUM ELECTRONICS 48 (5): Art. 286 (2016); doi: 10.1007/s11082-016-0556-4
10. 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 24 (1): 102-107 (2016); doi: 10.1364/OE.24.000102
11. Baravets, Y.; Honzátko, P.; Todorov, F.; Gladkov, P. „Generation of mid-infrared radiation in nonlinear crystals using fiber lasers“, JEMNÁ MECHANIKA A OPTIKA 60 (5-6): 168-170 (2015), ISSN 0447-6441.
12. Peterka, P.; Honzátko, P.; Kašík, I.; Podrazký, O.; Todorov, F.; Cajzl, J.; Koška, P.; Baravets, Y.; Aubrecht, J.; Mrázek, J. „Thulium-doped fibers and fiber-optic components for fiber lasers at around 2 μm“, JEMNÁ MECHANIKA A OPTIKA 60 (5-6): 174-177 (2015), ISSN 0447-6441.
13. Kašík, I.; Honzátko, P.; Peterka, P.; Mrázek, J.; Podrazký, O.; Aubrecht, J.; Proboštová, J.; Cajzl, J.; Todorov, F. „Speciální optická vlákna – srdce thuliových vláknových laserů a zesilovačů“, JEMNÁ MECHANIKA A OPTIKA 60 (1): 4-7 (2015), ISSN 0447-6441.
14. 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“, OPTICS EXPRESS 22 (24): 30024-30031 (2014); doi: 10.1109/LPT.2013.2272880
15. Písařík, M.; Peterka, P.; Zvánovec, S.; Baravets, Y.; Todorov, F.; Kašík, I.; Honzátko, P. „Fused fiber components for "eye-safe" spectral region around 2 µm“, OPTICAL AND QUANTUM ELECTRONICS 46 (4): 603-611 Sp. Iss. SI (2014); DOI 10.1007/s11082-013-9801-2
16. Peterka, P.; Honzátko, P.; Becker, M.; Todorov, F.; Písařík, M.; Podrazký, O.; Kašík,I. „Monolithic Tm-Doped Fiber Laser at 1951 nm With Deep-UV Femtosecond-Induced FBG Pair“, IEEE PHOTONICS TECHNOLOGY LETTERS 25 (16): 1623-1625 (2013); 10.1109/LPT.2013.2272880
17. Honzátko, P.; Baravets, Y.; Todorov, F.; Peterka, P.; Becker, M. „Coherently combined power of 20 W at 2000 nm from a pair of thulium-doped fiber lasers“, LASER PHYSICS LETTERS 10 (9): Art. 095104 (2013); doi: 10.1088/1612-2011/10/9/095104
18. Honzátko, P.; Baravets, Y.; Todorov, F. „A mode-locked thulium-doped fiber laser based on a nonlinear loop mirror“, LASER PHYSICS LETTERS 10 (7): Art. 075103 (2013); doi: 10.1088/1612-2011/10/7/075103
19. Todorov, F.; Čtyroký, J.; Jelínek, M.; Chomát, M.; Matějec, V.; Kubeček, V.; Martan, T.; Berková, D. „Bottle Microresonators Fabricated by Shaping Optical Fibers with a Beam of a CO2 Laser“, SENSOR LETTERS 9 (6): 2279-2282 Sp. Iss. SI (2011); doi:10.1166/sl.2011.1813
20. Matějec, V.; Jelínek, M.; Todorov, F.; Chomát, M.; Kubeček, V.; Berková, D.; Martan, T. „Effect of Sol-Gel Modifications on Characteristics of Silica Spherical Microresonators“, SENSOR LETTERS 9 (6): 2265-2267 Sp. Iss. SI (2011); doi: 10.1166/sl.2011.1801
21. Todorov, F.; Chomát, M.; Berková, D.; Čtyroký, J.; Matějec, V.; Kašík, I. „Sensitivity Characteristics of Long-Period Gratings Written with a CO2 Laser in Fiber with Parabolic-Index Cladding“, SENSOR LETTERS 7 (5): 979-983 (2009); doi: 10.1166/sl.2009.1184
22. Chomát, M.; Berková, D.; Todorov, F.; Čtyroký, J.; Matějec, V.; Kašík, I.; Proboštová, J.; Salvia, M.; Jehid, J. „Bend sensing with long-period fiber gratings in capillaries embedded in structures“, MATERIALS SCIENCE & ENGINEERING C-BIOMIMETIC AND SUPRAMOLECULAR SYSTEMS 28 (5-6): 716-721 (2008); doi: 10.1016/j.msec.2007.10.014
23. Slavík, R.; Todorov, F. „Tuning of long-period fibre gratings written by CO2 laser with resonant transmission below-45 dB“, ELECTRONICS LETTERS 43 (1): 18-19 (2007); doi: 10.1049/el:20072881
24. Císařovský, P.; Dunovský, J.; Kolařík, L.; Todorov, F.; Kašík, I.; Matějec, V. „Recording of long-period gratings in special single-mode fibers by a CO2 laser“, MATERIALS SCIENCE & ENGINEERING C-BIOMIMETIC AND SUPRAMOLECULAR SYSTEMS 26 (2-3): 448-452 Sp. Iss. SI (2006); doi: 10.1016/j.msec.2005.10.027
25. Chomát, M.; Čtyroký, J.; Berková, D.; Matějec, V.; Kaňka, J.; Skokánková, J.; Todorov, F.; Jančárek, A.; Bittner, P. „Temperature sensitivity of long-period gratings inscribed with a CO2 laser in optical fiber with graded-index cladding“, SENSORS AND ACTUATORS B-CHEMICAL 119 (2): 642-650 (2006); doi:10.1016/j.snb.2006.01.013

Conference papers:

1. Vaněk, M.; Vaniš, J.; Baravets, Y.; Todorov, F.; Čtyroký, J.; Honzátko, P. "Fiber facet gratings for use in high-power fiber lasers", WSOF 2017 - 5th Workshop on Specialty Optical Fibers and Their Applications, p.78, Limassol, Cyprus, October 11-13 (2017), SPIE 10603, Photonics, Devices, and Systems VII, 106030J (2017); doi: 10.1117/12.2293605
2. Vaněk, M.; Vaniš, J.; Baravets, Y.; Todorov, F.; Čtyroký, J.; Honzátko, P. "Fiber facet gratings for high power fiber lasers", Photonics Prague 2017, Prague, Czech Republic, August 28 - 30 (2017), SPIE 10603, Photonics, Devices, and Systems VII, 106030J (2017); doi: 10.1117/12.2293605
3. Aubrecht, J.; Peterka, P.; Honzátko, P.; Todorov, F.; Podrazký, O.; Kamrádek, M.; Proboštová, J.; Kašík, I. "Monolithic thulium-doped fiber laser", Photonics Prague 2017, Prague, Czech Republic, August 28 - 30 (2017), SPIE 10603, Photonics, Devices, and Systems VII, 106030L (2017); doi: 10.1117/12.2292912
4. Peterka, P.; Honzátko, P.; Aubrecht, J.; Navrátil, P.; Koška, P.; Todorov, F.; Podrazký, O.; Čtyroký, J.; Kašík, I. "Self-sweeping of laser wavelength and associated mode instabilities in fiber lasers",  [Invited], p. Tu.B6.2, 19th International Conference on Transparent Optical Networks (ICTON), Girona, Catalonia, Spain, July 2-6 (2017); doi: 10.1109/ICTON.2017.8024874
5. Vaněk, M.; Vaniš, J.; Baravets, Y.; Todorov, F.; Čtyroký, J.; Honzátko, P. " Anti-reflection and polarizing photonic structures for high-power fiber applications", SPIE Optics + Optoelectronics 2017, Prague, Czech Republic, April 24 - 27 (2017), SPIE 10232, Micro-structured and Specialty Optical Fibres V, 102320W (2017); doi: 10.1117/12.2271705
6. Vanek, M.; Vanis, J.; Baravets, Y.; Todorov, F.; Ctyroky, J.; Honzatko, P. „Thulium-doped high-power fiber laser with a polarizing diffraction grating on the fiber facet“, 2nd Annual Conference COST MP1401 „Advanced fibre laser and coherent source as tools for society, manufacturing and lifescience“, Tel Aviv, Israel, March 1-2 (2017)
7. Baravets, Y.; Honzátko, P.; Todorov, F. „Two-micron high-power thulium-doped fiber lasers and their applications“, Optické komunikace 2016 (Optics Communications 2016), Prague, Czech Republic, 1-2 November (2016)
8. Baravets, Y.; Honzátko, P.; Todorov, F.; Moravec, O. „Panoramatická laserová absorpční spektroskopie“ (in czech), Conference LASER 56, Třešť, Czech Republic, October 19-21 (2016), ISBN 978-80-87441-19-0
9. Honzátko, P.; Baravets, Y.; Mondal, S.; Peterka, P.; Todorov, F. „Coherent sources for mid-infrared laser spectroscopy“ (invited), SPIE 10142, 20th Slovak-Czech-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 101420G, Jasná, Slovakia, September 5-9 (2016); doi:10.1117/12.2263504
10. Baravets, Y.; Todorov, F.; Honzatko, P. „High-power thulium-doped fiber laser in all-fiber configuration“, SPIE 10142, 20th Slovak-Czech-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 101420G, Jasná, Slovakia, September 5-9 (2016); doi: 10.1117/12.2263526
11. Mrázek, J.; Vytykáčová, S.; Aubrecht, J.; Todorov, F.; Proboštová, J.; Kašík I. „Laser-assisted processing of nanocrystalline Eu0.05Y0.95Ti2O7 thin films for photonic applications“, 11th International Symposium on SiO2, Advanced Dielectrics and Related Devices, Nice, France, June 13-15 (2016)
12. Todorov, F.; Baravets, Y.; Honzátko, P.; Peterka, P.; Koška, P.; Kašík, I.; Podrazký, O. „60W Thulium Fiber Laser for Industrial and Medical Applications“, COST MP1401 1st Annual Conference, Advanced fibre laser and coherent source as tools for society, manufacturing and lifescience, Zadar, Croatia, April 12-15 (2016)
13. Mrázek, J.; Vytykáčová, S.; Aubrecht, J.; Todorov, F.; Proboštová, J.; Kašík I. „Laser processing of Ho0.05Y0.95Ti2O7 glass-ceramic thin films for photonic applications“, 24th International Congress of Glass (ICG), Shanghai, China, April 7-11 (2016)
14. Mrázek, J.; Vytykáčová, S.; Boháček, J.; Aubrecht, J.; Todorov, F.; Kašík I. „Laser-induced crystallization of nanocrystalline rare-earth doped yttrium titanates (RExY1-x)2Ti2O7 thin films“, Nanocon 2015, Brno, Czech Republic, November 14-16 (2015)
15. Honzátko, P.; Todorov, F.; Baravets, Y.; Peterka, P.; Kašík, I.; Koška, P.; Podrazký, O. „60W CW thuliový vláknový laser pro průmyslové a medicínské aplikace“ (in czech), Conference LASER 55, Třešť, Czech Republic, October 21-23 (2015), ISBN 978-80-87441-16-9
16. Baravets, Y.; Honzatko, P.; Todorov, F.; Gladkov, P. "Comparison of tunable narrow-band CW mid-IR generators based on the difference frequency generation in KTP and KTA crystals", 6th International Conference on Semiconductor Mid-IR Materials and Optics SMMO2015, Prague, Czech Republic, April 8-11 (2015), ISBN: 978-80-86269-23-8
17. Cajzl, J.; Peterka, P.; Benda, A.; Todorov, F.; Baravets, Y.; Podrazký, O.; Honzátko P.; Kašík, I. "Characterization and numerical modeling of holmium-doped optical fibers for fiber lasers at 2.1 µm", 6th International Conference on Semiconductor Mid-IR Materials and Optics SMMO2015, Prague, Czech Republic, April 8-11 (2015), ISBN: 978-80-86269-23-8
18. Koška, P.; Peterka, P.; Aubrecht, J.; Podrazky, O.; Todorov, F.; Baravets, Y.; Honzatko, P.; Kasik, I. "Enhanced Pump Absorption Efficiency in Coiled and Twisted Double-Clad Thulium-Doped Fibers", Advanced Solid State Lasers 2015, p. ATu2A.23, Berlin, Germany, October 4–9 (2015), OSA Technical Digest (online), (Optical Society of America, 2015); doi: 10.1364/ASSL.2015.ATu2A.23
19. Aubrecht, J.; Peterka, P.; Honzatko, P.; Koška, P.; Podrazky, O.; Todorov, F.; Kasik, I. “Self-Swept Holmium-Doped Fiber Laser near 2100 nm”, Advanced Solid State Lasers 2015, p. JTu2A.7, Berlin, Germany, October 4–9 (2015), OSA Technical Digest (online), (Optical Society of America, 2015); doi: 10.1364/ASSL.2016.JTu2A.7
20. Aubrecht, J.; Cajzl, J.; Peterka, P.; Honzátko, P.; Koška, P.; Baravets, Y.; Becker, M.; Podrazký, O.; Todorov, F.; Kašík, I. "Characterization of double-clad thulium-doped fiber with increased quantum conversion efficiency", SPIE Optics + Optoelectronics 2015, Conference on Micro-Structured and Specialty Optical Fibres IV, Prague, Czech Republic, April 15-16 (2015), SPIE 9507, Micro-structured and Specialty Optical Fibres IV, 95070P (2015); doi: 10.1117/12.2179630 
21. Peterka, P.; Todorov, F.; Honzátko, P.; Kašík, I. „Vláknové lasery – základní principy a aplikace“ (in czech), Využití laseru v průmyslu, Workshop, pp. 12-25, Plzeň, Czech Republic, March 16-18 (2015)
22. Cajzl, J.; Peterka, P.; Honzátko, P.; Mrázek, J.; Podrazký, O.; Todorov, F.; Gladkov, P.; Sahu, J. K.; Nunez-Velazquez, M.; Nekvindová, P.; Kašík, I. “Characterization of fluorescence lifetime of Tm-doped fibers with increased quantum conversion efficiency”, 8th International Conference on Photonics, Devices, and System VI. Prague, Czech Republic, August 27-29 (2014), SPIE 9450, Photonics, Devices, and Systems VI, 945017 (2015); doi: 10.1117/12.2070425
23. Honzátko, P.; Baravets, Y.; Todorov, F.; Gladkov, P. „Comparison of widely tunable narrow-band CW MIR generators based on the difference frequency generation in KTP and KTA crystals“, Advanced Solid State Lasers 2014, p. ATh2A.36, Shanghai, China, 16–21 November (2014), OSA Technical Digest (online) (Optical Society of America, 2014); doi: 10.1364/ASSL.2014.ATh2A.36 
24. Honzátko, P.; Baravets, Y.; Todorov, F.; Gladkov, P. „Široce laditelný generátor pro spektroskopii ve střední infračervené oblasti (3100-3600nm)“ (in czech), Conference LASER 54, Třešť, Czech Republic, October 29-31 (2014), ISBN 978-80-87441-13-8
25. Honzátko, P.; Baravets, Y.; Todorov, F.; Gladkov, P. „Tunable narrow‐band CW MIR generator based on the difference frequency generation in KTP crystal“, MIOMD-XII, Mid Infrared Optoelectronics Materials and Devices XII, We‐C‐5, Montpellier, France, Oct 5-9 (2014)
26. Peterka, P.; Honzatko, P.; Todorov, F.; Aubrecht, J.; Podrazky, O.; Kasik, I. "Self-Q-switched Regime of Fiber Lasers as a Transition from Self-Induced Laser Line Sweeping", Advanced Photonics 2014 Congress, Specialty Optical Fibers Conference, p. SoTh2B.6., Barcelona, Spain, July 27–31 (2014), OSA Technical Digest (online), (Optical Society of America, 2014); doi: 10.1364/SOF.2014.SoTh2B.6
27. Baravets, Y; Honzátko, P.; Todorov, F. „Narrow band CW MIR generator based on the difference frequency generation in KTP crystal“, 2nd Annual Conference of COST Action MP1204 and International Conference on Semiconductor Mid-IR Materials and Optics SMMO2014, Marburg, Germany, February 26 - March 1 (2014)
28. Peterka, P.; Honzatko, P.; Todorov, F.; Pisarik, M.; Podrazky, O.; Kasik, I. "Thulium-doped-fiber based ASE sources with spectrally-flattened spectrum", 22th International Laser Physics Workshop (LPHYS’13), p. 8.2.4, Prague, Czech Republic, July 15–19 (2013)
29. Peterka, P.; Honzatko, P.; Becker, M.; Todorov, F.; Pisarik, M.; Podrazky, O.; Kasik, I. "Monolithic thulium-doped fiber laser with UV femtosecond-laser-induced fiber-Bragg-grating pair", The European Conference on Lasers and Electro-Optics, CLEO Europe 2013, Munchen, Germany, May 12-16 (2013), Tech. Digest CLEO/Europe-IQEC 2013, p. CJ-P.5 WED; doi: 10.1109/CLEOE-IQEC.2013.6801398
30. Peterka, P.; Kašík, I.; Matějec, V.; Honzátko, P.; Martan, T.; Podrazký, O.; Slavík, R.;  Todorov, F.; Mrázek, J.; Kaňka, J. "Specialty optical fibers and components for fiber lasers and sensors in UFE" [invited paper], SPIE Optics+Optoelectronics, NSF Workshop on US-Czech Frontiers in Photonics, Prague, Czech Republic, April 15-18 (2013)
31. Peterka, P.; Honzatko, P.; Pisarik, M.; Todorov, F.; Baravets, Y.; Podrazky, O.; Kasik, I. "Components for thulium-doped fiber lasers", 1st Annual Conference of COST Action MP1204 and International Conference on Semiconductor Mid-IR Materials and Optics SMMO2013, p. 34, Warsaw, Poland, February 27 - March 2 (2013)
32. Peterka, P.; Todorov, F.; Kasik, I.; Matejec, V.; Podrazky, O.; Sasek, L.; Mallmann, G.; Schmitt, R."Wideband and high-power light sources for in-line interferometric diagnostics of laser structuring systems", 18th Czech-Polish-Slovak Optical Conference on Wave and Quantum Aspects of Contemporary Optics, Ostravice, Czech Republic, September 3-7 (2012), SPIE 8697, 869718 (2012); doi: 10.1117/12.2007388
33. Todorov, F.; Čtyroký, J.; Matějec, V.; Chomát, M.; Berková, D.; Kašík, I.; Martan, T.; Kubeček, V.; Jelínek, M.; Fibrich, M. “Preparation and characterization of bottle optical microresonators with circular and hexagonal cross-sections”, Photonics Prague 2011 - Photonics, Devices, and Systems, Prague, Czech Republic, August 24-26 (2011), SPIE 8306, Photonics, Devices, and Systems V, 83060Q (2011); doi: 10.1117/12.911986
34. Matějec, V.; Todorov, F.; Jelínek, M.; Fibrich, M.; Chomát, M.; Kubeček, V.; Barton, I.; Martan, T.; Berková, D. “Preparation of spherical optical microresonators and their resonance spectra in air and gaseous acetone”, Photonics Prague 2011 - Photonics, Devices, and Systems, Prague, Czech Republic, August 24-26 (2011), SPIE 8306, Photonics, Devices, and Systems V, 830605 (2011); doi: 10.1117/12.910786
35. Matějec, V.; Todorov, F.; Jelínek, M.; Fibrich, M.; Chomát, M.; Kubeček, V.; Berková, D. „Sensitivity of silica microspheres modified by xerogel layers to acetone and ethanol“, SPIE Optics + Optoelectronics, Optical Sensors, Prague, Czech Republic, April 18-21 (2011), SPIE 8073, Optical Sensors 2011; and Photonic Crystal Fibers V, 80730X (2011); doi: 10.1117/12.886683
36. M. Jelínek, F. Todorov, V. Matějec, M. Chomát, V. Kubeček, D. Berková, "Křemenné optické mikrorezonátory" (in czech), Optické komunikace 2010, pp.47-55, Prague, Czech Republic, October 21-22 (2010), ISBN 978-80-86742-29-8
37. F. Todorov, J. Čtyroký, M. Chomát, V. Matějec, D. Berková, M. Jelínek, V. Kubeček, "Bottle microresonators fabricated by shaping optical fibers with a beam of a CO2 laser", MADICA 2010, p.83, Tabarka, Tunisia, October 20-22 (2010)
38. V. Matějec, M. Jelínek, F. Todorov, M. Chomát, V. Kubeček, D. Berková, "Effect of sol-gel modifications on characteristics of silica microspheres", MADICA 2010, p.100, Tabarka, Tunisia, October 20-22 (2010)
39. F. Todorov, M. Jelínek, V. Matějec, M. Chomát, V. Kubeček, D. Berková, R. Sedlář, "Preparation and characterization of optical microspheres for refractive-index sensing", Photonics Europe 2010 - Micro-Optics, Brussels, Belgium, April 12-16 (2010), SPIE 7716, pp.77161X-1 - 77161X-9, (2010); doi: 10.1117/12.853839
40. V. Matějec, F. Todorov, M. Jelínek, M. Chomát, V. Kubeček, D. Berková, I. Kašík, R. Sedlář, "Preparation and characterization of silica and glass optical microspheres for refractive-index detection", EUROPT(R)ODE X, p.78, Prague, Czech Republic, March 28-31 (2010), ISBN 978-80-86269-20-7
41. F. Todorov, M. Chomát, V. Matějec, J. Čtyroký, D. Berková, I. Kašík, V. Kubeček, M. Jelínek, "Novel microresonators fabricated on optical fiber by shaping the fiber with a beam of a CO2 laser", EUROPT(R)ODE X, p.79, Prague, Czech Republic, March 28-31 (2010), ISBN 978-80-86269-20-7
42. Peterka, P.; Slavík, R.; Honzátko, P.; Todorov, F.; Krčmařík, D. „Applications of long-period fiber grating filters in cladding-pumped Yb-doped fiber lasers“, COST 299 School on Advanced Fibre Optics, Larnaca, Cyprus, 2-3 April (2009)
43. F. Todorov, V. Matějec, M. Chomát, D. Berková, M. Jelínek, V. Kubeček, R. Sedlář, " Optické mikroresonátory pro sensory a komunikace" (in czech), Optické komunikace 2009, pp.89-98, Prague, Czech Republic, October 22-23 (2009), ISBN 978-80-86742-28-1
44. F. Todorov, M. Chomát, J. Čtyroký, D. Berková, V. Matějec, I. Kašík, J. Dunovský, "Investigaton of temperature and bend sensitivities of long period gratings inscribed with a CO2 laser in optical fiber with graded-index cladding", Photonics 2008, New Delhi, India, December 13-17 (2008)
45. D. Berková, M. Chomát, F. Todorov, J. Čtyroký, V. Matějec, I. Kašík, "Sensitivity characteristics of long-period gratings written with a CO2 laser in fiber with parabolic-index cladding", MADICA 2008, paper B25, p.87, Rabat, Morocco, October 30 - November 1 (2008)
46. F. Todorov, M. Chomát, D. Berková, V. Matějec, I. Kašík, J. Kaňka, J. Dunovský, "Long-period gratings in a microstructure fiber with a planar array of air holes for directional bend sensing", MADICA 2008, paper B13, p.81, Rabat, Morocco, October 30 - November 1 (2008)
47. F. Todorov, R. Slavík, "New technique enabling inscription of axially symmetric long-period fiber gratings made by side-exposure of a CO2 laser beam", 16th Polish-Czech-Slovak Optical Conference on Wave and Quantum Aspects of Contemporary Optics, pp.32-33, Polanica Zdrój, Poland, Semptember 8-12 (2008)
48. F. Todorov, M. Chomát, D. Berková, J. Čtyroký, V. Matějec, I. Kašík, J. Dunovský, A. Jančárek, "Bend insensitive long-period gratings written with a CO2 laser in fiber with parabolic-index cladding", Photonics Asia 2007 - Sensors and Imaging, Beijing, China, November 11-15 (2007), SPIE 6830 - Advanced Sensor Systems and Applications III, pp.683005-1 – 683005-8, ISSN 0277-786X, ISBN 978–0–8194–7005–8, (2007); doi:10.1117/12.756314
49. M. Chomát, J. Čtyroký, D. Berková, V. Matějec, I. Kašík, J. Proboštová, F. Todorov, A Jančárek, "Long-period gratings with high insensivity to external refractive index inscribed by using a CO2 laser in fibers with parabolic-index cladding", SPIE Europe's International Congress on Optics and Optoelectronics - ICOO 2007, Prague, Czech Republic, April 23 (2007), SPIE 6585 - Optical Sensing Technology and Applications, pp.65850F.1-6580F.10, ISSN 0277-786X, ISBN 978-0-8194-6713-3 (2007); doi: 10.1117/12.723004
50. F. Todorov, J. Dunovský, L. Kolařík, M. Chomát, D. Berková, V. Matějec, "Multiple inscription of long-period gratings into single-mode optical fibers by a CO2 laser", MADICA 2006, p.122, Mahdia, Tunisia, October 30 – November 1 (2006)
51. M. Chomát, D. Berková, J. Čtyroký, V. Matějec, I. Kašík, M. Salvia, F. Todorov, A. Jančárek, "Structural bend sensing with long-period fiber gratings", MADICA 2006, p.127, Mahdia, Tunisia, October 30 – November 1 (2006)
52. F. Todorov, J. Dunovský, L. Kolařík, P. Kosek, M. Chomát, D. Berková, V. Matějec, ”Long-period gratings in optical fibers prepared by a CO2 laser“, CO-MA-TECH 2006, pp. 1332–1336, Trnava, Slovakia, October 19-20 (2006), ISBN 80-227-2472-6
53. F. Todorov, A. Jančárek, J. Dunovský, L. Kolařík, M. Chomát, D. Berková, V. Matějec, ”Long-period gratings inscribed into single-mode optical fibers by a CO2 laser“, ISQE 2006 - Laser physics and applications, p.97, Burgas, Bulgaria, September 18-22 (2006)
54. F. Todorov, A. Jančárek, J. Dunovský, L. Kolařík, M. Chomát, D. Berková, V. Matějec, “Long-Period Gratings Fabricated in Commercial Optical Fibers by a CO2 Laser”, ISCMP 2006, Advances in the Micro and Nano Physics of Solid and Soft Matter, pp. 128–131, Varna, Bulgaria, September 17-22 (2006)
55. Todorov, F.; Dunovský, J.; Kolařík, L.; Císařovský, P.; Chomát, M.; Berková, D.; Matějec, V.; Kašík, I. “LPGs in Single-mode Optical Fibers Prepared by a CO2 Laser”, CTU Reports - Proceedings of Workshop 2006, Vol B, pp. 468-469, Prague, Czech Republic, February 20-24 (2006), ISBN 80-01-03439-9
56. F. Todorov, J. Dunovský , L. Kolařík, P. Císařovský, M. Chomát, D. Berková, V. Matějec, I. Kašík, “Inscription of LPGs into IGI optical fibers by a CO2 laser“, CO-MAT-TECH 2005, p.184, Trnava, Slovakia, October 20-21 (2005), ISBN 80-227-2286-3
57. M. Chomát, V. Matějec, I. Kašík, J. Čtyroký, D. Berková, M. Hayer, J. Kaňka, F. Todorov, A. Jančárek, "Novel optical fibers for the inscription of long-period gratings", Photonics Prague 2005, 5th International Conference on Photonics, Devices and Systems, Prague, Czech Republic June 8-11 (2005), SPIE 6180, Photonics, Devices, and Systems III, 61800X (2006); doi: 10.1117/12.675684
58. Todorov, F.; Dunovský, J.; Císařovský, P.; Kolařík, L.; Jančárek, A.; Chomát, M.; Berková, D.; Matějec, V.; Kašík, I. „Long-period gratings in single-mode optical fibers prepared by CO2 lasers“, ME 2004, Proceedings of the Scientific-Technical Union of Mechanical Engineering 2/70/, Jan XI, pp. 390–391, Sofia, Bulgaria, May 13-15 (2004), ISSN 1310–3946
59. Todorov, F.; Dunovský, J.; Císařovský, P.; Kolařík, L.; Chomát, M.; Berková, D.; Jančárek, A. „Fabrication of Long-Period Gratings in Single-Mode Optical Fibers with CO2 Laser Radiation“, ISCMP 2004, Advances in the Physics and Technology of Solids and Soft Condensed Matter, Varna, Bulgaria, August 30 - September 3 (2004)
60. Císařovský, P.; Dunovský, J.; Kolařík, L.; Todorov, F.; Chomát, M.; Berková, D.; Vrbová, M.; Jančárek, A. „Production of Long-Period Optical Fiber Grattings by Exposure to a CO2 Laser Beam Radiation“, CTU Reports - Proceedings of Workshop 2004, Vol B, pp. 692-693, Prague, Czech Republic, March 22-26 (2004), ISBN 80–01–02945–X
61. P. Císařovský, J. Dunovský, L. Kolařík, F. Todorov, I. Kašík, V. Matějec, "The record of long-period gratings in single-mode fibers by CO2 laser", MADICA 2004, p.90, Tunis, Tunisia, November 29 - December 1 (2004)
62. Kolařík, L.; Dunovský, J.; Todorov, F.; Císařovský, P. „Production of Long-period Gratings in Optical Fibers by Radiation of CO2 Lasers“, CO-MAT-TECH 2004, pp. 610-617, Trnava, Slovakia, October 14-15 (2004), ISBN 80–227–2117–4

Prototypes, functional samples:

1. Písařík, M. - Turčín, V. - Peterka, P. - Baravets, Y. - Todorov, F. - Honzátko, P. „Prototyp výkonových odbočnic a vazebních členů“, (2016), link: http://hdl.handle.net/11104/0260464
2. Písařík, M. - Durstová, B. - Peterka, P. - Baravets, Y. - Todorov, F. - Honzátko, P. „Prototyp vlnového multiplexeru (WDM)“, (2016), link: http://hdl.handle.net/11104/0260463
3. Písařík, M. - Turčín, V. - Peterka, P. - Koška, P. - Baravets, Y. - Todorov, F. - Honzátko, P. „Prototyp slučovače čerpání a signálu s plášťovým uspořádáním navázání čerpání a s průchozím signálovým vláknem“, (2016), link: http://hdl.handle.net/11104/0260462
4. Peterka, P. - Honzátko, P. - Todorov, F. - Písařík, M. - Podrazký, O. - Kašík, I. - Cajzl, J. - Benda, A. „Funkční vzorek širokopásmového zdroje záření založeného na zesílené spontánní emisi v thuliem dopovaných vláknech“, (2016), link: http://hdl.handle.net/11104/0260460
5. Písařík, M. - Durstová, B. - Peterka, P. - Baravets, Y. - Todorov, F. - Honzátko, P. „Funkční vzorek vlnového multiplexeru (WDM) vlnových délek 1,6 a 2 mikrometry“, (2016), link: http://hdl.handle.net/11104/0260456
6. Písařík, M. - Turčín, V. - Peterka, P. - Baravets, Y. - Todorov, F. - Honzátko, P. „Funkční vzorek vazebního členu 50 % na vlnových délkách 1850-2000 nm“, (2016), link: http://hdl.handle.net/11104/0258763
7. Peterka, P. - Aubrecht, J. - Honzátko, P. - Todorov, F. - Podrazký, O. - Kašík, I. - Písařík, M. „Funkční vzorek modulu thuliového vláknového laseru“, (2015), link: http://hdl.handle.net/11104/0258762
8. Honzátko, P. - Peterka, P. - Todorov, F. - Kašík, I. „Kontinuální výkonový thuliový vláknový laser“, (2015), link: http://hdl.handle.net/11104/0257995

Other activities:

Guest Editor - Optical and Quantum Electronics, Volume 48, Issue 5 (2016) - Topical Collection „TERA-MIR Radiation: Materials, Generation, Detection and Applications“, ISSN: 0306-8919 (Print) 1572-817X (Online)

Organization of international events:

• ITS 2016 - International Training School on Fiber Lasers & Optical Fiber Technology, Prague, Czech Republic, 30.8.-1.9.2016, link: https://its.ufe.cz/
• 6th International Conference on Semiconductor Mid-IR Materials and Optics SMMO2015 & 3rd Annual Conference of COST Action MP1204, Prague, Czech Republic, 08-11.4.2015 (Book of Abstracts: ISBN 978-80-86269-23-8), link: http://www.ufe.cz/smmo2015/
• 7th Technical Meeting COST Action TD1001 (OFSeSa), Prague, 24-25.3.2014, link: http://www.ufe.cz/cost_td1001_prague2014/