Abstract
Photo-ionization of silicate glasses under high-power, 850 nm, femtosecond laser has been studied. It was found that color centers formation and intrinsic luminescence of boro- and alkali-silicate glasses occurred at irradiances well below the threshold for laser-induced damage. Simultaneously a supercontinuum generation in the visible and UV spectral regions was observed in all the glasses studied. From these studies it was deduced that photo- ionization of glass matrix results from linear and two-photon absorption of the short- wavelength component of the supercontinuum. No color center absorption in the visible region was observed in fused silica at irradiances up to the laser damage threshold.
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