[PDF]    http://dx.doi.org/10.3952/physics.v55i2.3101

Open access article / Atviros prieigos straipsnis

Lith. J. Phys. 55, 110116 (2015)

Ieva Gražulevičiūtė, Milda Skeivytė, Enrika Keblytė, Justinas Galinis, Gintaras Tamošauskas, and Audrius Dubietis
Department of Quantum Electronics, Vilnius University, Saulėtekio 9, LT-10222 Vilnius, Lithuania
E-mail: audrius.dubietis@ff.vu.lt

Received 10 March 2015; revised 10 April 2015; accepted 15 June 2015

We report on experimental investigation of supercontinuum generation in YAG and sapphire crystals using 1.1 ps, 1055 nm laser pulses. Under loose focusing conditions a stable single filament is generated without the onset of optical damage within the input power range of 6 to 10 Pcr, as verified from the near and far field measurements, and which gives rise to stable and reproducible supercontinuum spanning from 460 nm to 1.4 μm in YAG, and from 410 nm to 1.3 μm in sapphire. Permanent material modification, which develops under multiple laser shot exposure, is identified as the main limiting factor, which deteriorates the intensity distribution of the filament and dramatically alters the supercontinuum spectra.
Keywords: self-focusing and filamentation, supercontinuum generation, permanent material modification
PACS: 42.65.Jx, 42.65.Re


Ieva Gražulevičiūtė, Milda Skeivytė, Enrika Keblytė, Justinas Galinis, Gintaras Tamošauskas, Audrius Dubietis
Vilniaus universiteto Kvantinės elektronikos katedra, Vilnius, Lietuva

Eksperimentiškai ištirtas superkontinuumo generavimas YAG ir safyro kristaluose žadinant 1,1 ps trukmės, 1055 nm bangos ilgio lazerio impulsais. Švelnaus fokusavimo sąlygomis pradinio impulso galių intervale nuo 6 iki 10 Pcr sužadinta stabili šviesos gija, kuri lėmė gerai atsikartojančio superkontinuumo generavimą ir spektro plėtrą atitinkamai nuo 460 nm iki 1,4 μm YAG ir nuo 410 nm iki 1,3 μm safyro kristaluose. Nustatyta, kad ilgalaikė medžiagos savybių modifikacija dėl daugelio pasikartojančių impulsų poveikio yra lemiamas veiksnys, iškraipantis šviesos gijos intensyvumo skirstinį ir labai modifikuojantis superkontinuumo spektrą.

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