Photonics

Fiber laser module with brightness exceeding 10 MW/(cm$^2$ $\cdot$ sr)

A. V. Fomin, S. R. Usmanov, A. N. Ignatev, E. V. Kadigrob

Russian Federal Nuclear Center E. I. Zababakhin All-Russian Scientific Research Institute of Technical Physics, Snezhinsk, Chelyabinsk oblast, Russia

Abstract: The work was dedicated to the laser modules for the spectral range of 975 nm based on single laser diodes with fiber output to be designed and manufactured. The installation of an optical system for the seven laser diodes radiation input into a silica-silica fiber with a core diameter of 105 $\mu$m and a numerical aperture of 0.15 has been carried out while investigating their power and spectral characteristics. The maximum output power of the laser module was 65 W in CW operation at a nominal current of 12 A and a thermal stabilization temperature of 25$^\circ$C, the total efficiency of the laser module was 43%, and the brightness of the laser module amounted to 10.6 MW/(cm$^2$ $\cdot$ sr).

Keywords: laser module, optical system, laser diodes, fiber lasers.

Received: 01.12.2021
Revised: 18.01.2022
Accepted: 19.01.2022

DOI: 10.21883/JTF.2022.04.52250.305-21

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