We report a continuous-wave Er：ZBLAN fiber laser with the operation wavelength reaching 3.68 μm.The midinfrared Er：ZBLAN fiber laser is pumped with the dual-wavelength sources consisting of a commercial laser diode...We report a continuous-wave Er：ZBLAN fiber laser with the operation wavelength reaching 3.68 μm.The midinfrared Er：ZBLAN fiber laser is pumped with the dual-wavelength sources consisting of a commercial laser diode at 970 nm and a homemade Tm-doped fiber laser at 1973 nm.By increasing the launched pump power at1973 nm,the laser wavelength can be switched from 3.52 to 3.68 μm.The maximum output power of 0.85 W is obtained with a slope efficiency of 25.14% with respect to the 1973 nm pump power.In the experiment,the laser emission at 3.68 μm is obtained with a significant power of 0.62 W,which is the longest emission wavelength in free-running Er：ZBLAN fiber lasers.展开更多
We demonstrated a femtosecond mode-locked Er:Zr F4-Ba F2-La F3-Al F3-Na F(Er:ZBLAN)fiber laser at 2.8μm based on the nonlinear polarization rotation technique.The laser generated an average output power of 317 m W wi...We demonstrated a femtosecond mode-locked Er:Zr F4-Ba F2-La F3-Al F3-Na F(Er:ZBLAN)fiber laser at 2.8μm based on the nonlinear polarization rotation technique.The laser generated an average output power of 317 m W with a repetition rate of 107 MHz and pulse duration as short as 131 fs.To the best of our knowledge,this is the shortest pulse generated directly from a mid-infrared mode-locked Er:ZBLAN fiber laser to date.Numerical simulation and experimental results confirm that reducing the gain fiber length is an effective way to shorten the mode-locked pulse duration in the Er:ZBLAN fiber laser.The work takes an important step towards sub-100-fs mid-infrared pulse generation from mode-locked Er:ZBLAN fiber lasers.展开更多
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)+1 种基金the National Natural Science Foundation of China(No.61675130)the National Postdoctoral Program for Innovative Talents(No.190375)
文摘We report a continuous-wave Er：ZBLAN fiber laser with the operation wavelength reaching 3.68 μm.The midinfrared Er：ZBLAN fiber laser is pumped with the dual-wavelength sources consisting of a commercial laser diode at 970 nm and a homemade Tm-doped fiber laser at 1973 nm.By increasing the launched pump power at1973 nm,the laser wavelength can be switched from 3.52 to 3.68 μm.The maximum output power of 0.85 W is obtained with a slope efficiency of 25.14% with respect to the 1973 nm pump power.In the experiment,the laser emission at 3.68 μm is obtained with a significant power of 0.62 W,which is the longest emission wavelength in free-running Er：ZBLAN fiber lasers.
基金supported by the National Natural Science Foundation of China(Nos.61675130,91850203,and 11721091)the National Postdoctoral Program for Innovative Talents(No.BX20170149)。
文摘We demonstrated a femtosecond mode-locked Er:Zr F4-Ba F2-La F3-Al F3-Na F(Er:ZBLAN)fiber laser at 2.8μm based on the nonlinear polarization rotation technique.The laser generated an average output power of 317 m W with a repetition rate of 107 MHz and pulse duration as short as 131 fs.To the best of our knowledge,this is the shortest pulse generated directly from a mid-infrared mode-locked Er:ZBLAN fiber laser to date.Numerical simulation and experimental results confirm that reducing the gain fiber length is an effective way to shorten the mode-locked pulse duration in the Er:ZBLAN fiber laser.The work takes an important step towards sub-100-fs mid-infrared pulse generation from mode-locked Er:ZBLAN fiber lasers.
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.
