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Abstract: Intense 2.7μm emission from Er3+ doped in a new type of ZrF4-based fluoride glass is reported. 2.7μm emission characteristics and energy transfer process upon excitation of a conventional 980nm laser diode are investigated. Based on the absorption spectra, the Judd–Ofelt parameters and radiative properties were calculated and compared with those of other glass hosts. The prepared glass possesses higher predicted spontaneous transition probability (29.04s−1) along with larger calculated emission cross section (9.16×10−21 cm2). Besides, the energy transfer coefficient of laser upper level (4I11/2) can reach as high as 6.56×10−39 cm6/s. Hence, these results indicate that this Er3+ doped ZrF4-based fluoride glass has potential applications in 2.7μm laser. [Copyright &y& Elsevier]

Abstract: Broadband near-infrared emission has been investigated in a new type host composition of Er3+–Tm3+ codoped germanate glass. A broadband emission extend from 1350 to 1675nm with the full width at half maximum (FWHM) around 138nm is obtained in the germanate glass which codoped with 0.2 wt.% Er2O3 and 0.8 wt.% Tm2O3. The energy transfer between Er3+ and Tm3+ plays an important role in the emission mechanism, which is evidenced by the visible upconversion and the lifetime of Er3+:4I13/2 level effected by the addition of Tm2O3. And energy transfer efficiency from Er3+ to Tm3+ reaches 76% for the highest Tm3+ concentration of 0.8 wt.%. These results suggest that this glass would be a promising material for broadband light source and broadband amplifier for the wavelength division multiplexing transmission systems. [ABSTRACT FROM AUTHOR]

Abstract: Transparent oxyfluoride glass and glass ceramics doped with 3.0mol% Yb3+ and 0.5mol% Ho3+ ions have been prepared. The investigated samples show efficient 2.0μm emission. The absorption and emission cross sections corresponding to the 5I7–5I8 transitions of Ho3+ (at 2.0μm) have been calculated according to the McCumber theory. Glass sample heat-treated at 470°C has the maximum absorption and emission cross sections of 5.58×10−21 cm2 at 1949nm and 6.64×10−21 cm2 at 2034nm. The Yb3+–Ho3+ doped oxyfluoride glass ceramic exhibits an advantage for application in 2.0μm laser devices. [ABSTRACT FROM AUTHOR]

Abstract: Two micrometer emission of Ho3+-doped new fluorophosphate glass sensitized by Yb3+ upon excitation of a conventional 980nm laser diode is reported. Based on the measured absorption spectra, the Judd–Ofelt parameters and radiative properties were calculated and discussed. For Yb3+/Ho3+ codoped fluorophosphate glass, the predicted spontaneous transition probability and emission cross-section of Ho3+:5I7→5I8 reaches 73.54s−1 and 4.66×10−21 cm2 , respectively, are much higher than other reported glasses. Larger product of emission cross-section (σem ) and radiative lifetime (τrad ) in the prepared glass shows the prepared glass is expected to be better laser material. In addition, the σem and maximum gain coefficient of Ho3+ in Yb3+/Ho3+ codoped fluorophosphate glass is 12.02% and 12.12% larger than those of Ho3+ singly-doped sample, respectively. The results suggest Yb3+/Ho3+ fluorophosphate glass is a good candidate for efficient 2μm laser. [ABSTRACT FROM AUTHOR]