Non-spreading nature of Bessel spatiotemporal wavepackets is theoretically and experimentally investigated and orders of magnitude improvement in the spatiotemporal spreading has been demonstrated. The spatiotemporal confinement provided by the Bessel spatiotemporal wavepacket is further exploited to transport transverse orbital angular momentum through embedding spatiotemporal optical vortex into the Bessel spatiotemporal wavepacket, constructing a new type of wavepacket: Bessel spatiotemporal optical vortex. Both numerical and experimental results demonstrate that spatiotemporal vortex structure can be well maintained and confined through much longer propagation. High order spatiotemporal optical vortices can also be better confined in the spatiotemporal domain and prevented from further breaking up, overcoming a potential major obstacle for future applications of spatiotemporal vortex.

贝塞尔时空波包的非扩展特性在理论上和实验上得到了研究，并且已经证明了时空扩展的数量级改进。通过将时空光涡嵌入到贝塞尔时空波包中，进一步利用贝塞尔时空波包提供的时空限制来传输横向轨道角动量，构建了一种新型波包：贝塞尔时空光涡。数值和实验结果都表明，时空涡旋结构可以通过更长的传播得到很好的维持和限制。高阶时空光学涡旋也可以更好地限制在时空域内，防止进一步分裂，