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Novel technique for mode selection in a multimode fiber laser
J.M.O.Daniel1, J.S.P.Chan1, J.W.Kim1,2, J.K.Sahu1, M.Ibsen1 and W.A.Clarkson1
1. Optoelectronics Research Centre, University of Southampton, UK
2. Currently with the Department of Applied Physics, Hanyang University, Sa-1-dong, Ansan-si, Gyunggi-do, 426-791, South Korea
Abstract
A simple technique for transverse mode selection in a large-mode-area (multimode) fiber laser is described. The technique exploits the different spectral responses of feedback elements based on a fiber Bragg grating and a volume Bragg grating to achieve wavelength-dependent mode filtering. This approach has been applied to a cladding-pumped thulium-doped fiber laser with a multimode core to achieve a single-spatial-mode output beam with a beam propagation factor (M2) of 1.05 at 1923 nm. Without mode selection the free-running fiber laser has a multimode output beam with an M2 parameter of 3.3. Selective excitation of higher order modes is also possible via the technique and preliminary results for laser oscillation on the LP11 mode are also discussed along with the prospects for scaling to higher power levels.
Optics Express (2011) Vol.19(13) pp.12434-12439
doi: 10.1364/OE.19.012434
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Copyright University of Southampton 2006