Figure 14.11" Numerical simulation showing that a pipe structure in the center of a photosensi-
tive glass can be created using a donut-shaped writing beam. Successive frames show the nar-
rowing of the pipe induced through diffractive broadening of the writing beam. (After Ref. [65];
@2002 OSA.)
structure trapped a probe beam and directed it in the form of a channel waveguide. The
intensity of CW radiation required to build it was below 1 kW/cm 2. This intensity is
comparable to that used for forming dark spatial solitons in photorefractive materials.
One possible application of these permanent ...
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