Yingbo Chu

Yb³⁺-doped large core silica fiber for fiber laser prepared by glass phase-separation technology.

We report on the preparation and optical characteristics of an Yb(3+)-doped large core silica fiber with the active core prepared from nanoporous silica rod by the glass phase-separation technology. The measurements show that the fiber has an Yb(3+) concentration of 9811 ppm by weight, a low background attenuation of 0.02 dB/m, and absorption from Yb(3+) about 5.5 dB/m at 976 nm. The laser performance presents a high slope efficiency of 72.8% for laser emission at 1071 nm and a low laser threshold of 3 W within only 2.3 m fiber length. It is suggested that the glass phase-separation technology shows great potential for realizing active fibers with larger core and complex fiber designs.

Intense ultra-broadband down-conversion in co-doped oxide glass by multipolar interaction process.

We report that Eu(2+) can be an efficient sensitizer for Yb(3+) and a broadband absorber for blue solar spectra in the host of oxide glass. The greenish 4f → 5d transition of Eu(2+) and the characteristic near-infrared emission of Yb(3+) were observed, with the blue-light of xenon lamp excitation. The 5d energy can be adjusted by the host and the energy transfer efficiency can be enhanced. The quantum efficiency is up to 163.8%. Given the broad excitation band, high absorption coefficient and excellent mechanical, thermal and chemical stability, this system can be useful as down-conversion layer for solar cells.

Yb 3+ heavily doped photonic crystal fiber lasers prepared by the glass phase-separation technology

We report a Yb3+ heavily doped photonic crystal fiber with 30 μm core diameter manufactured for the first time by an alternative technique. Silica core rods with a diameter of 3 mm and a length of 280 mm were prepared by the sodium-borosilicate glass phase-separation technology. The measurements show that the fiber has an Yb3+ concentration of 22810 ppm by weight, and a resultant absorption of approximately 8.5 dB/m at 976 nm. The Yb3+ ions are distributed throughout the fiber core with an excellent homogeneity. The laser performance demonstrates a high slope efficiency of 64.5% for laser emission at 1033.4 nm and a low power threshold of 3 W within a short fiber length of 1 m. This novel approach provides an alternative means of preparing large active silica rods with high doping levels and excellent material homogeneity for large mode area fibers with complex designs.

Yb^3+ doped large core silica fiber based on glass phase-separation technology

We report on the preparation and optical characteristics of an Yb3+ doped large core silica fiber with the active core prepared by glass phase-separation technology.

Tm^3+-doped Large Core Silica Fiber Fabricated by the Nanoporous Glass

Tm3+ doped double cladding fiber with large core diameter was prepared through sintering nanoporous silica glass.The concentration of Tm3+ is up to 6000ppm . The Tm3+ ions distributed uniformly in the size of 30/400μm.