Elemental redistribution in glass induced by a 250-kHz femtosecond laser

Fluorescence imaging of lattice re-distribution on step-index direct laser written Nd:YAG waveguide lasers

“…The ultrafast laser induced modification of ionic species is not a new phenomenon as it has been previously reported in glasses in which laser induced ion diffusion has been reported to occur in several systems. 26 Nevertheless, experimental data included in Figure 2 constitutes to our knowledge the first evidence of the possibility of using sub-picosecond laser pulses to promote the permanent and localized lattice re-distribution in a crystalline environment (thus modifying rare earth ions' fluorescence emission shape). At this point, it should be noted that in previous studies the use of 350 fs pulse durations at 100 kHz did not produce the refractiveindex increment observed for 650 fs pulses.…”

Broadband infrared light-emitting patterns in optical glass by laser-induced nanostructuring of NiO-doped alkali-gallium germanosilicates

“…Nevertheless, laser-induced modifications of light-emission features are reported in some works. For instance, changes of luminescence properties were used to reveal structural transformations inside the glass and to explain laser-induced modification mechanisms, such as nanocrystal precipitation [8] or redistribution of different atoms in the irradiated area in oxyfluoride glasses [9]. However, only a few studies have examined laser-modified luminescence activity not just as a probe of structural changes but as a target for functional properties-for instance in glasses for optical memories based on laser-induced reduction of Sm 3 to Sm 2 [10] or Eu 3 to Eu 2 [11], both resulting in substantial modification of the light-emission spectra.…”