Abstract

Pumped by a narrow band Nd3+-doped fibre laser, a grating-free three-wavelength Raman fibre laser has been demonstrated. More than 1.3W output power at the third Stokes line of 1230 nm, a bandwidth of 1.8nm and a slope efficiency of ~28% was measured. A four-wavelength Raman fibre laser was also demonstrated using a different resonator that consisted of a 4% fibre end reflector, a dielectric mirror and a single fibre Bragg grating. This method is simple, versatile and cheap compared with conventional methods employing fibre Bragg gratings used to resonate all Stokes wavelengths.

© 2004 Optical Society of America

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References

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Appl. Phys. Lett.

F. L. Galeener, J. C. Mikkelsen, Jr., R. H. Geils, W. J. Mosby, �??The relative Raman cross sections of vitreous SiO2, GeO2, B2O3, and P2O5,�?? Appl. Phys. Lett. 32, 34-36 (1978).
[CrossRef]

Australian conference on optical fibre

Y. Li, S. D. Jackson, S. Fleming, �??Output characteristics of high power Nd3+ fibre laser,�?? Australian conference on optical fibre technology Proceeding, TuC2-3, 265-267 (2003).

Electron. Lett.

M. Krause, S. Cierullies, H. Renner, E. Brinkmeyer, �??Design of widely tuneable Raman fibre lasers supported by switchable FBG resonators,�?? Electron. Lett. 39, 1795-1797 (2003).
[CrossRef]

IEEE J. Lightwave Technol.

Z. Xiong, N. Moore, Z. G. Li, G. C. Lim, �??10-W Raman fibre lasers at 1248 nm using phosphosilicate fibres,�?? IEEE J. Lightwave Technol. 21, 2377-2381 (2003).
[CrossRef]

J. Bromage, �??Raman amplification for fibre communications systems,�?? IEEE J. Lightwave Technol. 22, 79-93 (2004).
[CrossRef]

IEEE Photon. Technol. Lett.

Y. G. Han, C. S. Kim, J. U. Kang, U. C. Paek, Y. J. Chung, �??Multiwavelength Raman fibre ring laser based on tuneable cascaded long period fibre gratings,�?? IEEE Photon. Technol. Lett. 15, 383-385 (2003).
[CrossRef]

J Opt. Soc. Am. B

S. D. Jackson, P. H. Muir, �??Theory and numerical simulation of nth-order cascaded Raman fibre lasers,�?? J Opt. Soc. Am. B 18, 1297-1306 (2001).
[CrossRef]

Opt. Lett.

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Figures (7)

Fig. 1.
Fig. 1.

Schematic configuration of cascaded Raman fibre laser. M: dielectric mirror; FBG: fibre Bragg grating; FER: fibre end reflector; OSA: optical spectrum analyzer.

Fig. 2.
Fig. 2.

Raman laser output spectrum measured at different launched pump powers for a 2 km long Raman fibre.

Fig. 3.
Fig. 3.

Raman laser output spectrum at different Raman fibre length for 2.5 W pump.

Fig. 4.
Fig. 4.

Total Stokes output powers versus launched power for different fibre lengths.

Fig. 5.
Fig. 5.

Raman laser output spectrum for 1km Raman fibre with FBG2.

Fig. 6.
Fig. 6.

Raman laser output characteristics for 1km Raman fibre with FBG2.

Fig. 7.
Fig. 7.

Raman laser output spectrum for 1 km Raman fibre without FBG2.

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