Different from the abruptly autofocusing induced by the linearity, we report a new type of abruptly autofocusing induced by the defocusing nonlinearity. By investigating the dynamics of the outward-focusing ring Pearcey–Gaussian (PeG) beam in defocusing nonlinear media, it is found that the propagation of the beam exhibits an abruptly autofocusing behavior of simultaneous intensity (the degree of the nonlocality) and position (the amplitude of the beam) control via adjusting the variable function. Our original findings represent the first theoretical realization of abruptly autofocusing behavior induced by the defocusing nonlinearity and can potentially be applied in optical tweezers and the optical switch.

与线性引起的突然自动对焦不同，我们报告了一种由散焦非线性引起的新型突然自动对焦。通过研究散焦非线性介质中外向聚焦环 Pearcey-Gaussian (PeG) 光束的动力学，发现光束的传播表现出同时强度（非局域性程度）和位置（非局域性程度）的突然自动聚焦行为。光束的幅度）通过调整变量函数来控制。我们最初的发现代表了由散焦非线性引起的突然自动聚焦行为的第一个理论实现，并且有可能应用于光镊和光开关。