Power scaling of high efficiency 1.5micron cascaded Raman fiber lasers

TL;DR

This paper presents a new high-efficiency architecture for 1.5-micron cascaded Raman fiber lasers, demonstrating significant power scaling and achieving 301 W output, comparable to state-of-the-art rare-earth fiber lasers.

Contribution

The paper introduces a novel high-efficiency architecture for cascaded Raman fiber lasers at 1.5 microns and demonstrates its effectiveness through numerical simulations and experimental results.

Findings

Achieved 301 W output power at 1.5 microns.

Identified optimal operating conditions via simulations.

Demonstrated power scaling comparable to rare-earth fiber lasers.

Abstract

High power fiber lasers operating at the 1.5micron wavelength region have attractive features like eye-safety and atmospheric transparency, and cascaded Raman fiber lasers offer a convenient method to obtain high power sources at these wavelengths. A limitation to power scaling however has been the lower conversion efficiency of these lasers. We recently introduced a high efficiency architecture for high power cascaded Raman fiber lasers applicable for 1.5micron fiber lasers. Here we demonstrate further power scaling using this new architecture. Using numerical simulations we identify the ideal operating conditions for the new architecture. We demonstrate a high efficiency 1480nm cascaded Raman fiber laser with an output power of 301 W, comparable to record power levels achieved with rare-earth doped fiber lasers in the 1.5 micron wavelength region.