Determining the relative impact of quantum efficiency and core propagation loss on efficient power scaling of thulium-doped silica fibre lasers

Martin Paul Buckthorpe; Richard Švejkar; William Andrew Clarkson

doi:10.1117/12.3002641

12 March 2024 Determining the relative impact of quantum efficiency and core propagation loss on efficient power scaling of thulium-doped silica fibre lasers

Martin Paul Buckthorpe, Richard Švejkar, William Andrew Clarkson

Author Affiliations +

Proceedings Volume 12864, Solid State Lasers XXXIII: Technology and Devices; 128640W (2024) https://doi.org/10.1117/12.3002641
Event: SPIE LASE, 2024, San Francisco, California, United States

Conference Poster

Abstract

A method for determining the quantum efficiency and core propagation loss in thulium-doped silica fibres is presented. The results provide evidence that thermal management of the fibre is a critical experimental parameter for achieving accurate predictions of fibre performance with this method. By submerging this ‘nested-ring’ fibre in a temperature-controlled water bath, a quantum efficiency of 1.93 was measured, providing evidence that the high doping level is successfully promoting the ‘two-for-one’ cross-relaxation process. Measurements of core propagation loss gave 0.15 dB/m, which is suggestive that core propagation loss presents a major issue for efficient power scaling to the kilowatt regime.

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Martin Paul Buckthorpe, Richard Švejkar, and William Andrew Clarkson "Determining the relative impact of quantum efficiency and core propagation loss on efficient power scaling of thulium-doped silica fibre lasers", Proc. SPIE 12864, Solid State Lasers XXXIII: Technology and Devices, 128640W (12 March 2024); https://doi.org/10.1117/12.3002641

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