Photographs showing luminescence distribution in the region inside (bottom) and
outside (top) of the self-written channel in a photosensitive silica waveguide. (After Ref. [57];
(~) 1998 APS.)
the self-written waveguide. Figure 14.9 shows two photographs obtained using this
luminescence. The top photograph shows the normal beam diffraction in the region
away from the self-induced waveguiding channel. The bottom photograph shows how
the beam spreading is reduced within the channel. Initially, the beam diffracts even
in this region. However, after some time, the index change ...
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