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Do Interacting Spatial Solitons Conserve Angular Momentum?

Optical spatial solitons have attracted substantial research interest since the 1960s, in part because they hold a promise of controlling light by light. Among all soliton studies, collisions between solitons is one of the most fascinating features, since, in many aspects, solitons interact like particles, maintaining their identities and conserving energy and linear momenta.1 Before 1990, all soliton interaction studies were limited to collisions in a single plane since practically all of the observed stable solitons before that time were 1-D.

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