Shunbin Wang

Holmium-doped fluorotellurite microstructured fibers for 2.1 μm lasing

Holmium (Ho3+)-doped fluorotellurite microstructured fibers based on TeO2-BaF2-Y2O3 glasses are fabricated by using a rod-in-tube method. By using a 1.992 μm fiber laser as the pump source, lasing at 2.077 μm is obtained from a 27 cm long Ho3+-doped fluorotellurite microstructured fiber. The maximum unsaturated power is about 161 mW and the corresponding slope efficiency is up to 67.4%. The influence of fiber length on lasing at 2.1 μm is also investigated. Our results show that Ho3+-doped fluorotellurite microstructured fibers are promising gain media for 2.1 μm laser applications.

Tapered fluorotellurite microstructured fibers for broadband supercontinuum generation

Fluorotellurite microstructured fibers (MFs) based on TeO2-BaF2-Y2O3 glasses are fabricated by using a rod-in-tube method. Tapered fluorotellurite MFs with varied transition region lengths are prepared by employing an elongation machine. By using a tapered fluorotellurite MF with a transition region length of ∼3.3  cm as the nonlinear medium and a 1560 nm femtosecond fiber laser as the pump source, broadband supercontinuum generation covering from 470 to 2770 nm is obtained. The effects of the transition region length of the tapered fluorotellurite MF on supercontinuum generation are also investigated. Our results show that tapered fluorotellurite MFs are promising nonlinear media for generating broadband supercontinuum light expanding from visible to mid-infrared spectral region.

Supercontinuum generation from 437 to 2850 nm in a tapered fluorotellurite microstructured fiber

We demonstrated supercontinuum (SC) generation in a tapered fluorotellurite microstructured fiber (MF) with a sub-micrometer core diameter. Fluorotellurite MFs based on TeO2–BaF2–Y2O3 glasses were fabricated by using a rod-in-tube method and a tapered fluorotellurite MF with a minimum core diameter of ~0.65 µm was prepared by employing a tapering system. A 1560 nm femtosecond fiber laser was used as the pumping source. With increasing the peak power of the launched pump laser to ~11 kW, SC light expanding from 437 to 2850 nm was generated in the tapered fluorotellurite MF. In addition, relatively strong blue-shifted dispersive wave at ~489 nm was also observed from the tapered fluorotellurite MF.

4.5 W supercontinuum generation from 1017 to 3438 nm in an all-solid fluorotellurite fiber

All-solid fluorotellurite fibers are fabricated by using a rod-in-tube method. The core and cladding materials are TeO2-BaF2-Y2O3 (TBY) and AlF3-based glasses, respectively. Since the refractive index (∼1.46) of AlF3-based glass is much lower than that (∼1.84) of TBY glass, the zero-dispersion-wavelength of the fabricated fiber can be tuned from 2145 to 1507 nm by varying the fiber core diameter from 50 to 3 μm. By using a 0.6 m long all-solid fluorotellurite fiber with a core diameter of ∼7 μm as the nonlinear medium and a 2 μm femtosecond fiber laser as the pump source, 4.5 W supercontinuum (SC) generation from 1017 to 3438 nm is obtained for a launched pump power of ∼10.48 W. The corresponding optical-to-optical conversion efficiency is about 42.9%. In addition, no any damage of the fluorotellurite fiber is observed during the operation of the above SC light source. Our results show that all-solid fluorotellurite fibers are promising nonlinear media for constructing high power mid-infrared SC light sou...

Supercontinuum generation from 437 to 2850 nm in a tapered fluorotellurite microstructured fiber with a minimum core diameter of 0.65 μm

We demonstrated supercontinuum generation from 437 to 2850 nm in a tapered fluorotellurite microstructured fiber with a minimum core diameter of 650 nm. The blue-shifted dispersive wave at ∼489 nm was also observed.

Enhancement of 800 nm upconversion emission in a thulium doped tellurite microstructured fiber pumped by a 1560 nm femtosecond fiber laser

We report enhanced upconversion (UC) fluorescence in Tm3+ doped tellurite microstructured fibers (TDTMFs) fabricated by using a rod-in-tube method. Under the pumping of a 1560 nm femtosecond fiber laser, ultrabroadband supercontinuum light expanding from ∼1050 to ∼2700 nm was generated in a 4 cm long TDTMF. Simultaneously, intense 800 nm UC emission from the 3H4 → 3H6 transition of Tm3+ was observed in the same TDTMF. Compared to that pumped by a 1560 nm continuous wave fiber laser, the UC emission intensity was enhanced by ∼4.1 times. The enhancement was due to the spectral broadening in the TDTMF under the pumping of the 1560 nm femtosecond fiber laser.

Ho 3+ /Yb 3+ co-doped Tellurite glasses and fibers for 1.2 µm laser applications

Intense 1.2 µm fluorescence was observed in Ho3+/Yb3+co-doped tellurite glasses under the pump of a 915 nm LD. A relative gain of ~6.7 dB at 1176 nm was obtained from a Ho3+/Yb3+co-doped tellurite microstructured fiber

Octave-spanning spectrum of mode-locked Er-doped fiber laser at 208MHz repetition rate in a dispersion-varying tellurite microstructured fiber

We demonstrated the generation of the octave-spanning spectrum from 800 to >2400 nm in a dispersion-varying-tellurite-microstructured-fiber pumped by an Er-doped fiber laser with a repetition rate of 208MHz and a pulse width of 71 fs.

Er^3+ doped low-hydroxyl fluorotellurite microstructured fibers for 2.7 μm laser applications

We developed a novel Er3+-doped low-hydroxyl fluorotellurite microstructured fiber (EDFTMF) and demonstrated intense emissions at ~2.7 μm from a 5 cm long EDFTMF with the excitation of a 980 nm laser for the first time

Tm 3+ or Ho 3+ Doped Fluorotellurite Microstructure Fiber for 2μm Lasing

Tm3+ (or Ho3+)-doped fluorotellurite microstructured fibers are fabricated by using a rod-in-tube method. By using resonance pumped method, all-fiber lasing at 1896nm and 2074nm are obtained from Tm3+ or Ho3+-doped fluorotellurite microstructured fibers, respectively