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Fundamentiniai ir taikomieji ultrasparčiosios netiesinės šviesos ir medžiagos sąveikos tyrimai skaidriose plačios apertūros terpėse ir fotoninių kristalų šviesolaidžiuose kompaktiškų didelės vidutinės galios ultratrumpųjų šviesos impulsų šaltinių, paremtų superkontinumo generacija, parametriniu šviesos stiprinimu, šviesolaidiniu lazeriniu stiprinimu, dažnio keitimu ir papildoma impulsų spūda, vystymui. 

Mokslinių tyrimų kryptys:

  • Netiesinis sklidimas ir superkontinuumo generacija plačios apertūros terpėse, fotoninių kristalų šviesolaidžiuose ir fotoniniuose kristaluose;

  • Šviesos impulsais indukuotos struktūrinės skaidrių medžiagų modifikacijos ir susiję netiesiniai optiniai reiškiniai;

  • Keleto optinių ciklų impulsų generacija remiantis spektro plėtra, parametriniu šviesos stiprinimu ir papildoma impulsų spūda;

  • Didelio pasikartojimo dažnio UV-VIS srityje derinamų femtosekundinių lazerinių sistemų vystymas;

  • Sub-nanosekundinių parametrinių šviesos generatorių ir stiprintuvų vystymas.

 

Research spotlight!

oea-cover.jpgThe generation of power- and wavelength-scalable few optical cycle pulses remains one of the major challenges in modern laser physics. Over the past decade, the development of table-top optical parametric chirped pulse amplification-based systems was progressing at amazing speed, demonstrating excellent performance characteristics in terms of pulse duration, energy, peak power and repetition rate, which place them at the front line of modern ultrafast laser technology. At present, table-top optical parametric chirped pulse amplifiers comprise a unique class of ultrafast light sources, which currently amplify octave-spanning spectra and produce carrier-envelope phase-stable, few optical cycle pulses with multi-gigawatt to multi-terawatt peak powers and multi-watt average powers, with carrier wavelengths spanning a considerable range of the optical spectrum.OEA.png 

This Article gives an overview on the state of the art of table-top optical parametric chirped pulse amplifiers, addressing their relevant scientific and technological aspects, and provides a short outlook of practical applications in the growing field of ultrafast science.

A. Dubietis, A. Matijošius, Table-top optical parametric chirped pulse amplifiers: past and present (REVIEW), Opto-Electronic Advances 6, 220046 (2023).

 

 

 

 


oea-cover.jpgHigh repetition rate femtosecond filaments in transparent solids produce conical third harmonic generation due to filament-induced material reorganization in the form of periodic volume nanogratings. Here we report on conical third harmonic generation that accompanies supercontinuum generation in fused silica using broadly tunable femtosecond pulses. The measurement of third harmonic cone angles with driving wavelengths in the 1–3-μm range fully supports the noncollinear phase-matching scenario that involves a reciprocal lattice vector of the filamoptlett figureent-inscribed nanograting. The nanograting provides an octave-spanning phase-matching bandwidth, as attested by the measurements of the angle-resolved spectra of broadband conical third harmonic emission.

R. Grigutis, V. Jukna, G. Tamošauskas, A. Dubietis, Broadband conical third harmonic generation in femtosecond filament-modified fused silica, Optics Letters 48, 506-509 (2023).

 

 

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The work discloses a flexible, non-destructive, aberration-free, and automated periodic poling quality evaluation technique of the periodically poled crystals in the whole volume of the crystal with very high control and resolution. The method is based on a crystal translation in the directions perpendicular to the pump laser beam and the simultaneous recording of the parametric signal conversion efficiency in a simple single-pass parametric lightoptik figure generator setup. This technique allowed us to investigate and quantitatively describe the ferroelectric domain structure homogeneity of the periodically poled lithium niobate and potassium titanyl phosphate crystals with single, multi, and fan-out grating designs and offers a practicable overall efficiency assessment of the quasi-phase-matched device.

J. Banys, J. Pimpė, O. Balachninaite, V. Jarutis, J. Vengelis, Non-destructive periodic poling quality evaluation of MgO:PPLN and Rb:PPKTP crystals based on crystal translation and parametric light generation, Optik 277, 170686 (2023).

 

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