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SchKPSvGenT pvzResearch topic ‒ the investigation of optical parametric oscillators synchronously pumped by femtosecond pulses or pumped by microlaser pulses. In the group there are three PhD students, their three supervisors and some students working mostly with PhD students. Two PhD students work with synchronously pumped optical parametric oscillators: one with the optical parametric oscillator pumped by the first harmonic and the other ‒ pumped by the second harmonic of a femtosecond ytterbium laser. Recently, femtosecond ytterbium lasers have started to be used intensively for the generation of high repetition rate amplified pulses, due to their ability to directly pump them with laser diodes. Because of this, laser oscillators of this type have been created generating ~100 MHz repetition rate femtosecond pulses. They could be widely applied in nonlinear microscopy, spectroscopy and other fields. However, this requires femtosecond pulses continuously tunable over a wide wavelength range generated using synchronously pumped optical parametric oscillators. This determined the intense research into the use of these lasers to pump such parametric oscillators. Research activities aiming to achieve effective parametric generation from the visible to the mid-infrared range of the spectrum were started in 2011 while cooperating with the “Light Conversion” company and supported by the Agency for Science, Innovation and Technology (MITA). The experimental setups for such parametric generators have already been constructed. Currently, automated experimental setups with the possibility of controlling the dispersive properties of synchronously pumped optical parametric oscillators are being developed. Research has also started into optical parametric generators, which enable wavelength tuning in the whole visible range of the spectrum, pumped by small energy picosecond pulses (200 – 500 ps) generated in a microlaser. Various methods of tunable picosecond pulse parametric generation will be tested: seed wave, generated in photonic crystal fiber, and direct parametric generation. A microlaser with amplification stage and harmonic generators produced by the “Standa” company is used for pumping.

SchKPSvGenT grParametric phenomena research group in the laboratory. From the left: Dr. R. Grigonis, stud. A. Marcinkevičiūtė, Prof. V. Sirutkaitis, PhD stud. K. Stankevičiūtė, Dr. V. Jarutis, PhD stud. I. Pipinytė, PhD stud. J. Vengelis

 

Group members:

  • Prof. V. Sirutkaitis,
  • Dr. R. Grigonis,
  • Dr. V. Jarutis,
  • PhD students: K. Stankevičiūtė, I. Pipinytė and J. Vengelis,
  • Students: I. Nemuraitė, A. Marcinkevičiūtė and S. Vaisiūnas.

Laboratory equipment:

  • Two synchronously pumped by first and second harmonic of Yb:KGW laser optical parametric ocillators operating at ~76 MHz repetition rate.
  • FLINT oscillator having an average power of 4 W.
  • Microlaser of the company “Standa”.