Thulium-doped silica fibers with enhanced 3H4 level lifetime: modelling the devices for 800-820 nm band

TL;DR

This paper models silica-based thulium-doped fibers with enhanced 3H4 lifetime to enable efficient 810 nm lasing, optimizing fiber and cavity parameters for high-power applications in the 800-820 nm range.

Contribution

It introduces a comprehensive numerical model and demonstrates optimized fiber and laser cavity parameters for efficient 810 nm lasing in silica-based thulium fibers with extended 3H4 lifetime.

Findings

Achieved 58 microseconds 3H4 lifetime in alumina-codoped fibers.

Identified specific cavity parameters for efficient 810 nm lasing.

Potential applications in amplifiers and broadband sources.

Abstract

Silica-based thulium-doped fiber devices operating around 810 nm would extend the spectral range covered by high- power fiber devices. Using a comprehensive numerical model of the fiber we have shown that efficient lasing at 810 nm can be achieved for specific ranges of the laser cavity parameters in silica-based thulium-doped fibers with enhanced 3H4 lifetime up to 58 \mus as measured in our highly alumina-codoped fibers. We present optimization of the thulium-doped fiber and laser cavity parameters and also potential applications of the developed host material in amplifiers and broadband sources.