Monolithic Thulium Fiber Laser with 567 W output power at 1970 nm

TL;DR

This paper presents a monolithic thulium fiber laser achieving a record 567 W output power at 1970 nm through optimized splicing and water cooling, demonstrating high power and efficiency in fiber lasers.

Contribution

The work reports the highest direct output power from a thulium oscillator, achieved by specific fiber splice optimization and cooling techniques, advancing high-power fiber laser technology.

Findings

Achieved 567 W output power at 1970 nm

Optimized splice parameters to minimize cladding signal loss

Demonstrated dual transverse mode operation with M^2 = 2.6

Abstract

We report on a monolithic thulium fiber laser with 567 W output power at 1970 nm, which is the highest power reported so far directly from a thulium oscillator. This is achieved by optimization of the splice parameters for the active fiber (minimizing signal light in the fiber cladding) and direct water cooling. Dual transverse mode operation is visible from the optical spectrum and can also be deduced from the measured beam quality of M^2 = 2.6. \c{opyright} 2016 Optical Society of America under Open Access Publishing Agreement. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.