Laser Cooled High-Power Fiber Amplifier

TL;DR

This paper presents a theoretical model for a laser cooled high-power fiber amplifier that achieves athermal operation through specific dopant distributions, combining laser amplification with cooling in a fluoride glass fiber.

Contribution

It introduces a novel theoretical framework for laser cooled fiber amplifiers with tailored dopant distributions enabling athermal operation.

Findings

Distribution of Tm3+ ions enables athermal operation.

Cooling in the Yb3+:ZBLAN cladding affects fiber temperature.

Small deviations in signal influence fiber temperature.

Abstract

A theoretical model for laser cooled continuous-wave fiber amplifier is presented. The amplification process takes place in the Tm3+-doped core of the fluoride ZBLAN (ZrF4-BaF2-LaF3-AlF3-NaF) glass fiber. The cooling process takes place in the Yb3+:ZBLAN fiber cladding. It is shown that for each value of the pump power and the amplified signal there is a distribution of the concentration of the Tm3+ along the length of the fiber amplifier, which provides its athermal operation. The influence of a small deviation in the value of the amplified signal on the temperature of the fiber with the fixed distribution of the Tm3+ions in the fiber cladding is investigated.