Self-cleaning effect in an all-fiber spatiotemporal mode-locked laser based on graded-index multimode fiber

TL;DR

This paper presents an all-fiber spatiotemporal mode-locked laser utilizing graded-index multimode fiber, demonstrating high pulse energy and improved beam quality due to a self-cleaning effect, enabling high-power, high-quality pulses.

Contribution

It introduces a novel all-fiber laser system based on graded-index multimode fiber that leverages the self-cleaning effect for improved beam quality and higher pulse energy.

Findings

Pulse energy up to 11.67 nJ achieved.

Beam quality significantly improved in mode-locked state.

High power, high beam quality pulses obtained in all-fiber system.

Abstract

We demonstrate an all-fiber spatiotemporal mode-locked laser based on graded-index multimode fiber. Due to the high damage threshold of graded-index multimode fiber devices, the output single-pulse energy reach up to 11.67 nJ. The beam quality at mode-locked state is significantly improved compared with continuous wave state as a result of the self-cleaning effect. By amplifying the pulse in the multimode fiber amplifier, high power pulses with high beam quality can be obtained in the all-fiber system based on graded-index MMFs.