Fiber lasers and non-linear optics

Focus

The research team deals with investigation of high power fiber lasers and their use for material processing, medicine and nonlinear optics. The main topics are laser beam combining, generation and amplification of optical pulses, guiding the light and its interaction with materials. High laser beam power achievable with fiber lasers allows for investigation of nonlinear effects like difference frequency generation. Difference frequency generation in periodically poled KTP crystals can be used to generate mid-infared radiation for the use in laser spectroscopy and metrology.

Research projects

• Low-phonon energy transparent ceramic luminophores emitting in the short- and mid-infrared
• Transparent ceramics optical fibers for lasers operating around 2.9 μm
• Novel nanostructured optical fibers for fiber lasers operating at dual wavelengths
• Fiber optic amplifier for wavelengths beyond L-band
• Light at the service of society (Programme of Strategy AV21)

Complete overview of projects

Publications

1. P. Vařák, M. Leich,  M. Kamrádek, J. Aubrecht, O. Podrazký, I. Bartoň, B. Švejkarová, A. Michalcová, K. Wondraczek, M. Jäger, I. Kašík, P. Peterka, P. Honzátko, “Nanoparticle doping and molten-core methods towards highly thulium-doped silica fibers for 0.79 μm-pumped 2 μm fiber lasers – A fluorescence lifetime study”, Journal of Luminescence, Volume 275, November 2024, 120835, Link
2. 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 
3. M. Grábner, B. Švejkarová, J. Aubrecht, J. Pokorný, P. Honzátko, P. Peterka, "Rise of amplified spontaneous emission in high-power thulium-doped fiber lasers and amplifiers due to self-heating," in Optics & Laser Technology, vol. 180, 2025, 111428, Link
4. Jan Aubrecht, Jan Pokorný, Bára Švejkarová, Michal Kamrádek, and Pavel Peterka, "Broadband thulium fiber amplifier for spectral region located beyond the L-band," Opt. Express 32, 17932-17941 (2024). Link
5. Jan Pokorný, Jan Aubrecht, Michal Kamrádek, Bára Švejkarová, Petr Vařák, Martin Grábner, and Pavel Peterka, "Depressed-cladding thulium-doped fiber for applications below 1800 nm," Opt. Express 32, 17966-17976 (2024). Link

Complete overview of publications