(a) Optical transmission micrograph of the double-filament structure fabricated by femtosecond laser writing in a crystal. (b) Near-field intensity distribution of the waveguides’ modes at 632.8 nm.
Typical a -luminescence (a) and -Raman (b) spectra obtained from the system in our experimental conditions. The different Raman modes contributing to our -Raman spectrum are properly labeled in (b).
Spatial distribution of the intensity (a), linewidth (b), and position (c) of the main luminescence peak within the band located at around .
Spectral shift induced in the main luminescence peak within the band (located at around ) as obtained along the horizontal scan schematically shown by a solid arrow on the top image. The position of filaments is indicated by the vertical shaded lines.
(a) Schematic drawing of the scan direction along which Raman measurements have been done. Spatial dependence of the integrated Raman intensity (b) and of the linewidth (c). Similar results, not shown for the sake of brevity, have been obtained when the spatial distribution of the linewidth of the other Raman modes has been analyzed.
(a) Schematic drawing of the scan direction through waveguide and filaments. (b) Spatial distribution of the energy shift of the four Raman modes under study in this work. The vertical dashed lines indicate the location of filaments.
Article metrics loading...
Full text loading...