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Grating-free nth order cascaded Raman fibre lasers using highly Ge-doped low loss fibre

2004; Optica Publishing Group; Volume: 12; Issue: 17 Linguagem: Inglês

10.1364/opex.12.004053

1094-4087

Yucheng Zhao, Yahua Li, Stuart D. Jackson,

Orbital Angular Momentum in Optics

Pumped by a narrow band Nd(3+)-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.