| anubiszf |
2010-01-07 20:32 |
The spatial spectrum is obtained by using a lens to yyke"D
do Fourier transform and the far-field spectrum is recorded % Q:i6 ~
by a CCD camera positioned in its focal plane. '\qd{mM\r
First, we summarize our results of on-axis excitation of a 0j*-ZvE)30
single 2D gap soliton in Fig. 1. Different from previous t_HS0rxG
experimental observations in which either the probe beam {2<A\nW
was launched off-axis to match the edge of the first BZ [6] nQ4 s
or its input phase or spectrum was engineered [11], we P6,~0v(S
demonstrate on-axis excitation of a 2D gap soliton without B{'x2I#,
a priori phase or spectral engineering. In fact, we show LB}y,-vX>
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