500 W rod-type 4x4 multi-core ultrafast fiber laser

TL;DR

This paper introduces a high-power, ultrafast fiber laser system using a 4x4 multicore Ytterbium-doped fiber, achieving 500 W power, femtosecond pulses, and excellent beam quality, with scalability potential.

Contribution

It demonstrates a novel 4x4 multicore fiber architecture for ultrafast laser generation with high power and pulse energy, scalable by increasing core count.

Findings

Achieved 500 W average power at 10 MHz repetition rate.

Generated <500 fs pulses with up to 600 μJ energy.

System exhibits excellent beam quality and scalability.

Abstract

We present a coherently-combined femtosecond fiber CPA system based on a rod-type, Ytterbium-doped, multicore fiber with 4x4 cores. A high average power of up to 500 W (after combination and compression) could be achieved at 10 MHz repetition rate with an excellent beam quality. Additionally, <500 fs pulses with up to 600 uJ of pulse energy were also realized with this setup. This architecture is intrinsically power scalable by increasing the number of cores in the fiber.