| Abstract [eng] |
Filament Induced Luminescence in Doped and Undoped YAG and Sapphire Crystals High intensity light propagating in transparent medium forms light filaments which result in strong spatial, temporal and spectral reshaping of the pulse, generates supercontinuum and induces luminescence in its path via multiphoton absorbtion. It is shown that supercontinuum generation in doped crystals is not suppressed by absorbtion of dopants. Spectrum contains absorbtion lines of ions, but in general it appears similar as in undoped crystal. On the other hand, analysis of filament-induced luminescence in doped and undoped YAG and sapphire crystals revealed that the emission spectrum is identical to radio-, cathodo- and ion beam luminescence spectra and can provide information on the energy deposition to embedded dopants, impurities and the crystal lattice itself. Furthermore, it is shown that the qualitative features of emission are independent of the excitation wavelength. By moving speciman relatively to filament, it is possible to selectively excite and locate defects, dopant or impurities. The results suggest that filament-induced luminescence can serve as a fast, simple, non-destructive spectroscopic analysis technique for transparent dielectrics. Results of this work are published by American Institute of Physics. Citation: "D. Kudarauskas, G. Tamošauskas, M. Vengris, and A. Dubietis, Filament-induced luminescence and supercontinuum generation in undoped, Yb-doped, and Nd-doped YAG crystals, Appl. Phys. Lett. 112, 041103 (2018);". |
