Spatiotemporal Mode-Locking in Lasers with Large Modal Dispersion

Dissipative nonlinear wave dynamics have been investigated extensively in mode-locked lasers with single transverse-mode, whereas there are few studies related to three-dimensional within lasers. Recently, spatiotemporal mode-locking (STML) was proposed small modal (i.e., transverse-mode) dispersion, which has considered be critical for achieving STML those cavities because the dispersion can easily balanced. Here, we demonstrate that also achieved multimode much larger where find intracavity saturable absorber plays an important role counteracting large dispersion. Furthermore, observe a new phenomenon of passive auto-selection single-mode mode-locking, resulting from interaction between absorption and spatial gain competition. Our work significantly broadens design possibilities useful thus making them more accessible applications, extends explorable parameter space novel dissipative these