Xueqiang Liu

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We report the near to middle infrared luminescence and energy transfer process of Er(3+)/Yb(3+) co-doped fluorotellurite glasses under 980, 1550 and 800 nm excitations, respectively. Using a 980 nm laser diode pump, enhanced 1.5 and 2.7 μm emissions from Er(3+):I13/2→(4)I15/2 and I11/2→(4)I13/2 transitions are observed, in which Yb(3+) ions can increase(More)
A novel method is introduced using to evaluate the quality of thin-film transistor (TFT) array for driving active-matrix display (OLED). By the means of this method, the operation states of the TFT or the defects of TFT can be judged. It is a current testing method with the advantages of fast response, excellent precision, no effect to aperture and no(More)
AlF3-based glasses (AlF3-YF3-CaF2-BaF2-SrF2-MgF2) with enhanced thermal and chemical stability were synthesized and compared with the well-known fluorozirconate glass (ZBLAN). The 2.7 μm mid-infrared emission in the AlF3-based glasses was also investigated through the absorption and emission spectra. Both the temperature of glass transition and the(More)
The realization of an all-solid photonic bandgap optical fiber (PBGF) based on silicate glasses in spectral wavelength band ~920 nm is achieved. The structure parameters and bandgap of the fiber are both demonstrated theoretically by plane-wave expansion method calculations and experimentally by near-field measurements. The all-solid silicate glass PBGF has(More)
We present a detailed characterization of enhanced 2.0 μm emission and energy transfer processes by codoping Ce3+ in ZBYA: Ho3+/Er3+ glasses under 1550 nm excitation. The measured absorption and emission spectra show that Er3+ ions are efficiently excited by pumping and energy transfer from Er3+: 4I13/2 to Ho3+: 5I7 level. The 2.0 μm emission from the Ho3+:(More)
The room-temperature Stark splitting properties of Yb3+ are practical and valuable for lasers because the working temperature of the gain media intensively increases with the laser output. In this Letter, the room-temperature Stark splitting properties of Yb3+ in several popular laser glasses are contrastively studied. Yb3+-doped germanate (Ge), borate (B),(More)
Er3+-doped fluorozirconate (ZrF4-BaF2-YF3-AlF3) and oxyfluoroaluminate glasses are successfully prepared here. These glasses exhibit significant superiority compared with traditional fluorozirconate glass (ZrF4-BaF2-LaF3-AlF3-NaF) because of their higher temperature of glass transition and better resistance to water corrosion. Judd-Ofelt (J-O) intensity(More)
This work reports the intense emissions at 2.7 and 2.84 μm in a Ho³⁺/Er³⁺-codoped fluoride glass (ZrF₄-BaF₂-YF₃-AlF₃). An extensive transmission spectrum and the absence of strong OH⁻ absorption guarantee the observation of mid-infrared (IR) emissions. For the Ho³⁺/Er³⁺-codoped sample, the 2.7- and 2.84-μm emissions are 5.8 and 3.8 times higher with larger(More)
A single-mode laser output of 0.75 W near 2 &#x03BC;m was obtained with a slope efficiency of 28.7% with respect to the absorbed pump power when a self-developed double-cladding Tm<sup>3+</sup>-doped tellurium germanate glass fiber laser was pumped using a 793-nm diode laser. The core glass possesses an infrared cutoff edge reaching ~5 &#x03BC;m. The(More)
Alkaline potassium permanganate solution (APP) was applied to the pretreatment of corncob with a simple and effective optimization of APP concentration, reaction time, temperature and solid to liquid ratio (SLR). The optimized pretreatment conditions were at 2% (w/v) potassium permanganate with SLR of 1:10 treating for 6h at 50°C. This simple one-step(More)