Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA.
Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA and Department of Physics and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China.
Phys Rev Lett. 2013 Nov 27;111(22):223601. doi: 10.1103/PhysRevLett.111.223601. Epub 2013 Nov 26.
We have observed spatial interactions between two ultraweak optical beams that are initially collinear and nonoverlapping. The weak beams are steered towards each other by a spatially varying cross-Kerr refractive index waveguide written by a strong laser beam in a three-level coherently prepared atomic medium. After fusing together, the combined beam shows controllable phase-dependent behaviors. This is the first observation of solitonlike interactions between weak beams and can be useful for all-optically tunable beam combining, switching, and gating for weak photonic signals.
我们观察到了两束初始共线且不重叠的超弱光束之间的空间相互作用。弱光束在强激光写入的三阶相干制备原子介质中的空间变化的交叉克尔折射率波导的作用下相互靠拢。融合后，组合光束表现出可控的相位相关行为。这是首次观察到弱光束之间类似孤子的相互作用，这对于弱光信号的全光可调光束组合、开关和选通可能非常有用。
