Generation of femtosecond radial-mode vortex pulses from a solid-state oscillator
Shiya Yang·Jinwei Zhang·Kunjian Dai·Alexander Gliserin·Soo Hoon Chew·Heyan Liu·Lisong Yan·Hongyu Liu
Abstract Laguerre-Gaussian (LG) vortex beams with non-zero radial indices provide an additional spatial degree of freedom beyond conventional azimuthal-order vortices, yet their generation in the femtosecond regime has remained experimentally challenging. Here, we report the direct generation of femtosecond radial-mode LG vortex pulses enabled by a mode-locked solid-state oscillator. Higher-order Hermite-Gaussian (HG) pulses are stably excited inside a SESAM-based Yb:KGW oscillator through contr