Journal
APPLIED SCIENCES-BASEL
Volume 5, Issue 4, Pages 1323-1336Publisher
MDPI AG
DOI: 10.3390/app5041323
Keywords
nonlinear fibre optics; fiber lasers; Raman lasers
Categories
Funding
- Engineering and Physical Sciences Research Council (EPSRC) Centre for Innovative Manufacturing in Photonics [EP/H02607X/1]
- European Office of Aerospace Research and Development [FA8655-11-1-3088 P00001]
- Engineering and Physical Sciences Research Council [EP/E027318/1, EP/H02607X/1] Funding Source: researchfish
- EPSRC [EP/E027318/1, EP/H02607X/1] Funding Source: UKRI
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We describe novel fiber Raman lasers pumped directly by spectrally combined high power multimode laser diodes at similar to 975 nm and emitting at similar to 1019 nm. With a commercial multimode graded-index fiber, we reached 20 W of laser output power with a record slope efficiency of 80 %. With an in-house double-clad fiber, the beam quality improved to M-2 = 1.9, albeit with lower output power and slope efficiency due to higher fiber loss. We believe this is the first publication of a fiber Raman laser cladding-pumped directly by diodes.
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