Journal article
Coherent combining of high brightness tapered amplifiers for efficient non-linear conversion
Université Paris-Saclay1
Biophotonic Imaging, Nano and Bio-physical Systems, Department of Health Technology, Technical University of Denmark2
Biomedical Engineering, Department of Health Technology, Technical University of Denmark3
Department of Health Technology, Technical University of Denmark4
Diode Lasers and LED Systems, Department of Photonics Engineering, Technical University of Denmark5
Department of Photonics Engineering, Technical University of Denmark6
Leibniz-Institut für Höchstfrequenztechnik7
We report on a coherent beam combination of three high-brightness tapered amplifiers, which are seeded by a single-frequency laser at λ = 976 nm in a simple architecture with efficiently cooled emitters. The maximal combined power of 12.9 W is achieved at a combining efficiency of > 65%, which is limited by the amplifiers’ intrinsic beam quality.
The coherent combination cleans up the spatial profile, as the central lobe’s power content increases by up to 86%. This high-brightness infrared beam is converted into the visible by second harmonic generation. This results in a high non-linear conversion efficiency of 4.5%/W and a maximum power over 2 W at 488 nm, which is limited by thermal effects in the periodically poled lithium niobate (PPLN).
Language: | English |
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Year: | 2019 |
Pages: | 928-937 |
ISSN: | 10944087 |
Types: | Journal article |
DOI: | 10.1364/OE.27.000928 |
ORCIDs: | Hansen, A. K. and Jensen, Ole Bjarlin |