Multimode Mamyshev oscillator
Regular mode-locked lasers make short light pulses by synchronization or “locking” of many longitudinal cavity modes. It was recently shown that the transverse modes of a cavity can also be synchronized in a similar— but more general— form of mode-locking known as “spatiotemporal mode-locking” (STML). These lasers make ultrafast pulses that have spatial structure due to the many transverse modes involved. Understanding of this phenomenally complex phenomenon is limited: STML has so far been demonstrated a handful of times in relatively similar types of multimode fiber lasers. In this project, we study STML in a very different type of cavity architecture— the Mamyshev oscillator. The laser supports a vast array of mode-locked states. Learning to control these states in a meaningful way is a long-term goal which might enable gigawatt-class fiber lasers, or fiber lasers that generate purposefully-structured light for applications.