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2010-01-07 20:32 |
The spatial spectrum is obtained by using a lens to _
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do Fourier transform and the far-field spectrum is recorded C{YTHN n
by a CCD camera positioned in its focal plane. o6 8; -b'n
First, we summarize our results of on-axis excitation of a cB2~W% H
single 2D gap soliton in Fig. 1. Different from previous XpdjWLO]C<
experimental observations in which either the probe beam ;eP. B/N
was launched off-axis to match the edge of the first BZ [6] )Nl xW5
or its input phase or spectrum was engineered [11], we G4"[ ynlWV
demonstrate on-axis excitation of a 2D gap soliton without qO>A 6
a priori phase or spectral engineering. In fact, we show -\g@s@5
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