Abstract
Using fully incoherent white light emitted from an incandescent bulb (aline source) and amplitude mask, we study experimentally theinteraction between two 2D white-light photovoltaic dark spatialsolitons with three different separations (40 μm, 50 μm and60 μm) and arrangement directions (parallel to, perpendicular toand tilted at 45° with respect to the crystalline c axis)propagating in parallel in close proximity in self-defocusingLiNbO3:Fe crystal. Experimental results reveal that a 2Dwhite-light dark soliton pair only experiences attractive forces whentheir mutual separation is sufficiently small (<60 μm), and thedegree of the attraction depends on their mutual separation and theirarrangement direction. When the separation is larger than 60 μm,the interaction is not evident.
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