An All Passive Architecture for High Efficiency Cascaded Raman Conversion

TL;DR

This paper introduces an all-passive architecture for high-efficiency cascaded Raman fiber lasers, achieving 60% efficiency and 64W power output without added complexity, enabling scalable high-power sources at various wavelengths.

Contribution

The paper presents a novel all-passive architecture for cascaded Raman conversion that improves efficiency without increasing system complexity.

Findings

Achieved 60% conversion efficiency.

Generated 64W output power at 1480nm.

Demonstrated fifth-order cascaded Raman conversion.

Abstract

Cascaded Raman fiber lasers have offered a convenient method to obtain scalable, high-power sources at various wavelength regions inaccessible with rare-earth doped fiber lasers. A limitation previously was the reduced efficiency of these lasers. Recently, new architectures have been proposed to enhance efficiency, but this came at the cost of enhanced complexity, requiring an additional low-power, cascaded Raman laser. In this work, we overcome this with a new, all-passive architecture for high-efficiency cascaded Raman conversion. We demonstrate our architecture with a fifth-order cascaded Raman converter from 1117nm to 1480nm with output power of ~64W and efficiency of 60%.