Abstract
Highly-efficient high-power fiber lasers operating at wavelength below 1020nm are critical for tandem-pumping in >10kW fiber lasers to provide high pump brightness and low thermal loading. Using an ytterbium-doped-phosphosilicate double-clad leakage-channel fiber with ∼50μm core and ∼420μm cladding, we have achieved ∼70% optical-to-optical efficiency at 1018nm. The much larger cladding than those in previous reports demonstrates the much lower required pump brightness, a key for efficient kW operation. The demonstrated 1018nm fiber laser has ASE suppression of ∼41dB. This is higher than previous reports and further demonstrates the advantages of the fiber used. Limiting factors to efficiency are also systematically studied.
Original language | English |
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Pages (from-to) | 17693-17700 |
Number of pages | 8 |
Journal | Optics Express |
Volume | 23 |
Issue number | 14 |
DOIs | |
Publication status | Published - 13 Jul 2015 |
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics