Our research group studies the interaction between high intensity femtosecond laser pulses and transparent dielectric media, leading to the formation of the unique structures of light – femtosecond filaments. These light beams have many unique properties: sub-diffraction propagation, highly localized energy in space and time, high stability and the generation of narrow plasma channels. These properties make femtosecond filaments an interesting object for scientific and technological research, promising new possibilities in material processing, photonics and ultrafast nonlinear optics. Femtosecond filaments form in transparent dielectric media due to the wide range of nonlinear interactions between media and light: self-interaction of light beams and pulses, multi-photon absorption and the generation of free electron plasma. The net result of nonlinear processes, diffraction and dispersion, leads to the transformation of a laser pulse and beam in space and time, leading in turn to the formation of nonlinear X-waves or light bullets. At the same time, temporally and spatially coherent wide bandwidth radiation is generated – femtosecond supercontinuum.

fssvgt grupeFemtosecond filament research group in the laboratory. From the left: BSc stud. E. Keblytė, Dr. J. Galinis, MSc stud. M. Skeivytė, MSc stud. R. Šuminas, Dr. G. Tamošauskas, MSc stud. I. Gražulevičiūtė, Prof. A. Dubietis, Prof. G. Valiulis, MSc stud. N. Garejev


Group members:

  • prof. A. Dubietis,
  • prof. G. Valiulis,
  • dr. G. Tamošauskas,
  • dr. V. Jukna,
  • PhD students N. Garejev, R. Šuminas,  A. Marcinkevičiūtė.

Main research topics:

  • Femtosecond filaments, the temporal and spatial dynamics of their generation and propagation in media with normal and anomalous dispersion
  • Excitation of femtosecond supercontinuum in the wide band gap dielectric media
  • Generation and amplification of the few-optical-cycle pulses in the mid-infrared spectral range
  • The formation and characterization of nonlinear X waves, light bullets and the statistical analysis of extreme optical waves

This research topic has been analyzed since 2002. We collaborate with the following international research centers: University of Insubria (Como, Italy), Heriot-Watt University (Edinburgh, Scotland), University of Jena (Germany) and the Centre de Physique Théorique (Palaiseau, France). We have contributed to two chapters in monographs published by international publishers, and have published over 100 scientific papers in international journals. We have been cited over 2000 times.