In this Letter, a new, to the best of our knowledge, type of autofocusing and symmetric beam arisen from two quartic spectral phases is introduced in theory and experiment. The symmetric Pearcey Gaussian beam (SPGB), formed with a Gaussian term and two multiplying Pearcey integrals, processes a focusing intensity approximately 1.32 times stronger than the intensity of the symmetric Airy beam. Its four off-axis main lobes split into four bending trajectories symmetrically after focusing. The rectangular intensity distribution and the focal length of the SPGB can be adjusted by two kinds of distribution factors. Additionally, the vortex-guiding property of the beam is demonstrated by embedding an off-axis vortex into the SPGB, which can be applied in particle guiding.

中文翻译：

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对称皮尔斯高斯光束

在这封信中，就我们所知，从理论和实验上介绍了一种新的自动聚焦类型和由两个四次光谱相位产生的对称光束的类型。对称的Pearcey高斯光束（SPGB）由高斯项和两个相乘的Pearcey积分形成，其聚焦强度约为对称Airy光束强度的1.32倍。聚焦后，它的四个离轴主瓣对称地分成四个弯曲轨迹。SPGB的矩形强度分布和焦距可以通过两种分布因子进行调整。此外，通过将离轴涡旋嵌入SPGB中可以证明光束的涡旋引导特性，该特性可以应用于粒子引导。