Evidence of thermal effects in high power Er3+-Yb3+ fiber laser

TL;DR

This paper investigates how heat generated by non-radiative transitions affects high-power Er-Yb fiber lasers, revealing that thermal effects influence lasing thresholds and efficiency at 1.55μm.

Contribution

It introduces a model incorporating heat effects and Stark level populations, demonstrating thermal influence on laser performance at high power levels.

Findings

Heat generation impacts lasing thresholds.

Thermal effects improve 1.55μm laser efficiency.

1μm lasing can occur due to parasitic reflections.

Abstract

We analyse the influence of heat generation by non radiative transitions in high power 1.55$\mu$m double cladding Erbium-Ytterbium fiber laser. At strong pumping rates, 1$\mu$m lasing can start due to parasitic reflections. We present a model including heat generation and its effect on the Stark level population using the MacCumber relation. Heat generation plays then a significant role and improves the 1.5$\mu$m laser efficiency by increasing the 1$\mu$m threshold.