High-power ultrafast fiber lasers operating at the 2μm wavelength are extremely desirable for material processing,laser surgery,and nonlinear optics.Here we fabricated large-core(LC)double-cladding Tm-doped silica fi...High-power ultrafast fiber lasers operating at the 2μm wavelength are extremely desirable for material processing,laser surgery,and nonlinear optics.Here we fabricated large-core(LC)double-cladding Tm-doped silica fiber via the sol-gel method.The sol-gel-fabricated Tm-doped silica(SGTS)fiber had a large core diameter of 30μm with a high refractive index homogeneity(Δn=2×10^(-4)).With the newly developed LC SGTS fiber as the gain fiber,high-power mode-locking was realized.By using a semiconductor saturable absorber mirror(SESAM)as a mode locker,the LC SGTS fiber oscillator generated mode-locked pulses with an average output power as high as 1.0 W and a pulse duration of 23.9 ps at the wavelength of 1955.0 nm.Our research results show that the self-developed LC Tm-doped silica fiber via the sol-gel method is a promising gain fiber for generating high-power ultrafast lasers in the 2μm spectral region.展开更多
基金partially supported by the National Basic Research Program of China(No.2013CBA01505)the Shanghai Excellent Academic Leader Project(No.15XD1502100)the National Natural Science Foundation of China(Nos.61675130 and 11421064)
文摘High-power ultrafast fiber lasers operating at the 2μm wavelength are extremely desirable for material processing,laser surgery,and nonlinear optics.Here we fabricated large-core(LC)double-cladding Tm-doped silica fiber via the sol-gel method.The sol-gel-fabricated Tm-doped silica(SGTS)fiber had a large core diameter of 30μm with a high refractive index homogeneity(Δn=2×10^(-4)).With the newly developed LC SGTS fiber as the gain fiber,high-power mode-locking was realized.By using a semiconductor saturable absorber mirror(SESAM)as a mode locker,the LC SGTS fiber oscillator generated mode-locked pulses with an average output power as high as 1.0 W and a pulse duration of 23.9 ps at the wavelength of 1955.0 nm.Our research results show that the self-developed LC Tm-doped silica fiber via the sol-gel method is a promising gain fiber for generating high-power ultrafast lasers in the 2μm spectral region.
