| anubiszf |
2010-01-07 20:32 |
The spatial spectrum is obtained by using a lens to iCc@N|~
do Fourier transform and the far-field spectrum is recorded KZ/ }Iy>As
by a CCD camera positioned in its focal plane. ro^Y$;G
First, we summarize our results of on-axis excitation of a ``>WFLWTn
single 2D gap soliton in Fig. 1. Different from previous ymr-kB
experimental observations in which either the probe beam crZ\:LeJ
was launched off-axis to match the edge of the first BZ [6] .hETqE` E
or its input phase or spectrum was engineered [11], we Y,>]) R[4
demonstrate on-axis excitation of a 2D gap soliton without i]9SCO
a priori phase or spectral engineering. In fact, we show WlWBYnphZs
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