Jan Aubrecht, Ph.D.

Research interests:

The development of characterization methods for optical fibers, fiber lasers and amplifiers.

Professional activities:

2008 - today: Fellow researcher at Czech Technical University- Faculty of Nuclear Sciences and Physical Engineering, Department of Solid States Engineering;  

2007 - today: Institute of Photonics and Electronics of the CAS, Postdoc position since 2014

Education:

2006 - 2014: Czech Technical University- Faculty of Nuclear Sciences and Physical Engineering, Department of Solid States Engineering, PhD-study

2001 - 2006: Czech Technical University - Faculty of Nuclear Sciences and Physical Engineering, Department of Solid States Engineering, MS degree - thesis: Detection of gaseous ammonia using evanescent optical sensor (1). Final state examinatin from : Solid State Physics (1), Solid State Theory (1), Semiconductor Materials and Devices (1).

Current Research projects:

Member of the projects:

• Novel optical fibers and their spectroscopy for fiber lasers operating beyond 2 um
• Self-sweeping of laser wavelength and associated instabilities of fiber lasers

Selected past research projects:

Member of the projects:

• Novel silica-based Ho -doped nanomaterials for 2-μm-class fibre laser research
• Bragg fibers for delivery of high laser powers
• 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
• Regulation of morphogenesis of plant cells and organs

Publications:

Books:

1. Kalvoda L., Aubrecht J., Levinský P.,: "Development of Distributed Fiber Optic Sensor of Ammonia Gas", In Ammonia: Structure, Biosynthesis and Functions – Victoria A. Fekete and Réka L. Molnár (Eds.), Series: Chemical Engineering Methods and Technology, Nova Science Publishers, Inc., 2012, book chapter.
2. I. 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. 
3. Sýkora, O., Aubrecht, J., Klepacek, R., Kalvoda, L: "Simulation of Distributed Detection of Ammonia Gas, " In: Computation Modelling and Advancend Simulations, Springer, Heidelberg, Computational Methods in Applied Sciences 24, 2011, book chapter.

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. 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. Aubrecht, J., Kalvoda, L.: "Development of Ammonia Gas Sensor Using Optimized Organometallic Reagent," Journal of Sensors, Volume 2016, 58, http://dx.doi.org/10.1155/2016/8425758, 2016.
6. Koška, P., Peterka, P., Aubrecht, J., Podrazký, O., Todorov, F., Becker, M., Baravets, Y., Honzátko, P., and Kašík, I.: "Enhanced pump absorption efficiency in coiled and twisted double-clad thulium-doped fibers," Opt. Express 24(1):102-107, http://dx.doi.org/10.1364/OE.24.000102, 2016.
7. 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), 2015.
8. Martan, T., Aubrecht, J., Podrazký, O., Matějec, V., Kašík, I.: "Detection of hydrocarbons using suspended core microstructured optical fiber," Sensors and Actuators B: Chemical, http://dx.doi.org/10.1016/j.snb.2014.04.103, 2014.
9. Kasik, I., Podrazky, O., Mrazek, J., Cajzl, J., Aubrecht, J., Probostova, J., Peterka, P., Honzatko, P., Dhar, A.: "Erbium and Al2O3 nanocrystals-doped silica optical fibers," Bulletin of the Polish Academy of Sciences: Technical Sciences, 62 (4), DOI: 10.2478/bpasts-2014-0070, 2014.
10. Peterka, P., Honzátko, P., Koška, P., Todorov, F., Aubrecht, J., Podrazký, O., and Kašík, I.: "Reflectivity of transient Bragg reflection gratings in fiber laser with laser-wavelength self-sweeping," Opt. Express 22:30024-30031, http://dx.doi.org/10.1364/OE.22.030024, 2014.
11. 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 12(6):567-574, 2014.
12. Peterka, P., Honzátko, P., Todorov, F., Kasik, I., Aubrecht, J., Podrazký, O.: "Self-Q-switched regime of fiber lasers as a transition from self-induced laser line sweeping", Specialty Optical Fibers, SOF 2014, http://www.scopus.com/inward/record.url?eid=2-s2.0-84919772399&partnerID..., 2014.
13. 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 27, 312-318, 2014.
14. Matějec, V., Kašík, I., Podrazký, O., Aubrecht, J., Frank, M., Jelínek, M., Kubeček, V., "Preparation and characterization of bragg fibers for delivery of laser radiation at 1064 nm," Radioengineering, 22 (1), 2013.
15. Kasik, I., Mrazek, J., Podrazky, O., Seidl, M., Aubrecht, J., Pospisilova, M., Tobiska, P., Matejec, V., Kovacs, B., Markovics, A., Szili, M.: "Fiber- optic detection of chlorine in water," Sensors and Actuators: B 139 (1), 139-142, 2009.  
16. Kašík, I., Mrázek, J., Podrazký, O., Seidl, M., Aubrecht, J., Tobiška, P., Matějec, V., Kovács, B., Markovics, A., Szili, M.: "Preparation and characterization of thin transducer layers sensitive to free chlorine in water," Materials Science and Engineering C 28 (5-6), 842-847, 2008. 
17. Kalvoda, L., Aubrecht, J., Klepacek, R.: "Fiber Optic Detection of Ammonia Gas," Acta Polytechnica 46(2), 2006.

Conference papers:

1. Aubrecht, J., Peterka, P., Kašík, I., Podrazký, O., Cajzl, J., Benda, A., Baravets, Y., and Honzátko, P.: "Characterization and numerical modeling of holmium-doped fibers with various concentrations for fiber lasers, 20th Slovak-Czech-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics, Jasná pod Chopkom, 2016.
2. Aubrecht, J., Peterka, P., Honzatko, P., Baravets, Y., Jelínek, M., et al.: "Characterization of holmium fibers with various concentrations for fiber laser applications around 2.1 μm," Proc. of SPIE, http://dx.doi.org/10.1117/12.2227618, 2016.
3. Aubrecht, J., Kalvoda, L., Fojtikova, J.: "Characterization of long-term stability of PDMS-based chemo-optical transducer driving distributed fiber optic sensor of ammonia gas," Proceedings of SPIE, http://dx.doi.org/10.1117/12.2236706, 2016.
4. Aubrecht, J., Kalvoda, L., Levinský, P., Fojtíková, J.: "The modification methods of polymer fiber cladding for sensing application," Proceedings of SPIE, 9450, art. no. 94500L, http://dx.doi.org/10.1117/12.2070462, 2015.
5. Aubrecht, J., Cajzl, J., Peterka, P., Honzátko, P., Koška, P., Baravets, Y., Becker, M., Podrazký, O., Todorov, F., and Kašík, I.: "Characterization of double-clad thulium-doped fiber with increased quantum conversion efficiency," Proc. of SPIE, http://dx.doi.org/10.1117/12.2179630, 2015.
6. Levinský, P., Kalvoda, L., Aubrecht, J., Fojtíková, J.: "Diffusion of ammonia gas in PDMS characterized by ATR spectroscopy, " Proceedings of SPIE, 9450, http://dx.doi.org/10.1117/12.2070372,  2015.
7. 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, " Proceedings of SPIE, art. no. 94501A, http://dx.doi.org/10.1117/12.2070351, 2015.
8. Mrázek, J., Nikl, M., Kašík, I., Podrazký, O., Aubrecht, J., Beitlerová, A: "Nanoparticle-doped radioluminescent silica optical fibers," Optical Fibers and Their Applications (SPIE) 9228, 2014.
9. Aubrecht J., Kalvoda L. "Development of absorption fiber optic sensor for distributed measurement of ammonia gas," Proceedings of SPIE, 8774, art.no.877417, http://dx.doi.org/10.1117/12.2017281, 2013.
10. Cajzl, J., Podrazky, O., Mrazek, J., Aubrecht, J., Matejec, V., Peterka, P., Nekvindová, P., Kasik I.: "The influence of nanostructured optical fibre core matrix on the optical properties of edfa," Proceedings of SPIE, 8775, 2013.
11. 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," Optics and Optoelectronics (SPIE) 8775, 2013.
12. Martan, T., Aubrecht, J., Podrazký, O., Kašík, I., Matějec, V., Kaňka, J.: "Microstructure optical fibres for detection of gaseous analytes," The International Society for Optical Engineering (SPIE) 8073, 2011. 
13. Pospíšilová, M., Aubrecht, J., Martan, T., Mrázek, J., Kašík, I., Matějec, V.: "Dependence of detected intensity of fluorescence of dye on optical fiber tapered tip diameter," The International Society for Optical Engineering (SPIE) 8073, 2011.
14. Martan, T., Pospíšilová, M., Aubrecht, J., Mrázek, J., Podrazký, O., Kašík, I., Matějec, V.: "Tapered optical fibres for local pH detection," Journal of Physics: Conference Series 206, 2010. 
15. Martan, T., Kašík, I., Podrazký, O, Mrázek, J., Pospíšilová, M., Aubrecht, J., Matějec, V., Kaňka, J.: "Local Detection of pH Using Optical Fibre Probes," Proc. 6th Journees Maghreb-Europe, Les Materiaux et Leurs Applications aux Dispositifs Capteurs (MADICA), 2008. 
16. Kašík, I., Mrázek, J., Podrazký, O., Seidl, M., Aubrecht, J., Pospíšilová, M., Tobiška, P., Matějec, V., Kovacs, B., Markovics, A., Szili, M.: "Detection of chlorine in water", 2008. 
17. Podrazký, O., Mrázek, J., Seidl, M., Kašík, I., Tobiška, P., Matějec, V., Martan, T., Aubrecht, J.: "Optical principle of pH measurement for detection of auxin flow through cellular membrane," In Proc. SPIE, 2007.