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Input and output beam waists after a dc bias of 35 kV/cm is turned on.
The Gaussian beam profile 4(a) (a parabola in log scale) changes into a squared-hyperbolic secant when the soliton is formatted 4(b) (a cusp curve, as introduced in Ref. 12). This behavior has been confirmed numerically 4(c) for both Gaussian (dotted line) and soliton regimes (continuous line).
Experimental waist dimension with numerical fit from the theoretical model for 35 kV/cm of bias: (a) along the axis; (b) along the axis.
As in Fig. 4 for 20 kV/cm of bias. Open circles: axis; closed squares: axis. The beam is not completely confined even after 1 h, as shown in the small image at the right top corner.
Waveguiding properties of the solitonic channels. The images show both the soliton writing process and the waveguide modal profile as a function of the age time.
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