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Zhang L.,Jiangsu University | Zhang L.,Jiangsu Key Laboratory of Advanced Laser Materials and Devices | Liu Q.,Nanjing University | Ding N.,Nanjing University | And 5 more authors.
Science of Advanced Materials | Year: 2017

Gd3+ ions substituted Na(La0.98-xGdxEu0.02)2MgWO6 phosphors with ordered double-perovskite structure were successfully synthesized by an improved citrate-EDTA complexing method. The structure's, changes and the resulting luminescence variation were systematically investigated by X-ray diffraction with Rietveld structure refinement, Raman spectra, Fourier transform infrared spectra, excitation and emission spectra. The decreased symmetry and lattice parameters within the same space group C2/m were observed from the Gd3+ substituted powders. The substitution of Gd3+ made the T2g(1) Raman mode to broaden and blueshift due to a decreased lattice volume, an enhanced covalent bonding effect, and "Lanthanide contraction" phenomenon. The excitation intensity ratio of CTB/4f -4f reversed when x ≥ 0.7. The intensity of 5D0-7F2 monotonically increased under the excitations of both near UV and blue light, being enhanced nine and four times, respectively, and they becaming almost equal when x = 0.98. The relative intensity ratio of red/orange emission gradually increased and the CIE chromaticity coordinates gradually approached the standard red light. The substitution of Gd3+ not only enhanced the luminescence intensity and acceptance for different excitation chips, but also greatly improved the red light quality. "A site induced energy transfer" in double perovskite that results in the luminescence enhancement of Eu3+, was achieved by selecting the substitution element with the small radius but big electronegativity. The radiation transition of electric dipole of Eu3+ was greatly enhanced due to the low crystal symmetry, increased covalence of Eu3+-O2-, and especially the shorted Eu-O bond length. © 2017 by American Scientific Publishers All rights reserved.


Wang Y.,Jiangsu University | Wang Y.,Jiangsu Key Laboratory of Advanced Laser Materials and Devices | Wang Y.,Fudan University | Wang S.,Jiangsu University | And 15 more authors.
IEEE Photonics Technology Letters | Year: 2014

Vector soliton generation is experimentally demonstrated in an all-fiber Tm/Ho-doped fiber laser operated at 1951 nm. To the best of our knowledge, it is the first clear evidence of group-velocity-locked vector soliton formation around 2 \mu{\rm m}. Numerical simulation well reproduces the experimental observation and suggests that the central wavelength shift between the two orthogonal polarized components of the vector soliton is determined by the cavity birefringence. The central wavelength shift increased with the increasing of the cavity birefringence. However, the vector solitons become linearly polarized if the cavity birefringence is too strong. Experimental observation and numerical simulations both suggest that the vector soliton generation is wavelength independent. © 1989-2012 IEEE.


Wang Y.,Fudan University | Wang Y.,Jiangsu Key Laboratory of Advanced Laser Materials and Devices | Wang Y.,Jiangsu University | Zhao T.,Fudan University | And 8 more authors.
Optics Express | Year: 2014

We report on an acousto-optic Q-switched 1645 nm Er:YAG ceramic laser resonantly pumped by using an Er,Yb fiber laser at 1532 nm. Maximum continuous wave output powers of 2.1 W and 2.4 W were obtained for 10% and 20% transmission OCs under 10.5 W of incident pump power, respectively. In Q-switched mode, the laser produced pulses with ∼3.7 mJ energy and 82 ns width at 200 Hz repetition rate for 20% transmission OC under 8.6 W of incident pump power, corresponding to a peak power of ∼45 kW. ©2014 Optical Society of America.


Luo J.L.,Jiangsu University | Luo J.L.,Jiangsu Key Laboratory of Advanced Laser Materials and Devices | Li L.,Jiangsu University | Li L.,Jiangsu Key Laboratory of Advanced Laser Materials and Devices | And 11 more authors.
IEEE Photonics Technology Letters | Year: 2014

We report an L-band passively mode-locked erbium-doped fiber ring laser using the nonlinear polarization rotation technique. The center wavelength of the fiber laser can be tuned from 1575.5 to 1603.6 nm. The 458.7-fs pulses at 1603.6 nm show an 8.6-MHz pulse repetition rate. To the best of our knowledge, it is the longest wavelength for which subpicosecond pulses have been achieved so far with the nonlinear polarization rotation technique. © 1989-2012 IEEE.

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