High power, fixed and tunable wavelength, Grating-free Cascaded Raman fiber Lasers

TL;DR

This paper presents a simple, high-power, grating-free cascaded Raman laser architecture that achieves fixed and tunable wavelengths, enabling efficient conversion to eye-safe wavelengths with over 30W power.

Contribution

The work introduces a novel, grating-free design for cascaded Raman lasers that allows for wavelength tunability and high power output, overcoming limitations of conventional grating-based systems.

Findings

Achieved over 30W output power in fixed and tunable configurations

Demonstrated wavelength conversion from Ytterbium band to 1.5 micron region

Enabled high-power operation without fiber gratings

Abstract

Cascaded Raman lasers enable high powers at various wavelength bands inaccessible with conventional rare-earth doped lasers. The input and output wavelengths of conventional implementations are fixed by the constituent fiber gratings necessary for cascaded Raman conversion. We demonstrate here, a simple architecture for high power, fixed and wavelength tunable, grating-free, cascaded Raman conversion between different wavelength bands. The architecture is based on the recently proposed distributed feedback Raman lasers. Here, we implement a module which converts the Ytterbium band to the eye-safe 1.5micron region. We demonstrate pump-limited output powers of over 30W in fixed and continuously wavelength tunable configurations.