Eye-safe 1.5～1.6 μm lasers have important applications in optical fiber communi- cation, medicine, laser-range-finding, lidar, etc. Er3+ and Yb3+ co-doped crystal pumped by diode laser around 976 nm is an attractive...Eye-safe 1.5～1.6 μm lasers have important applications in optical fiber communi- cation, medicine, laser-range-finding, lidar, etc. Er3+ and Yb3+ co-doped crystal pumped by diode laser around 976 nm is an attractive method for obtaining 1.5～1.6 μm laser in compact device with high output beam quality. In this paper, the recent research and progress of several important Er3+ and Yb3+ co-doped laser crystals at 1.5～1.6 μm in authors’ lab are reported.展开更多
We demonstrated that tridoping with F- ions is an effective way to improve the fluorescence quantum efficiency of CaWO4:Eu3+,Na+ nanocrystals. F--tridoped samples with different F- concentrations were synthesized by a...We demonstrated that tridoping with F- ions is an effective way to improve the fluorescence quantum efficiency of CaWO4:Eu3+,Na+ nanocrystals. F--tridoped samples with different F- concentrations were synthesized by a hydrothermal process. The fluorescence spectra and decay curves were measured at room temperature. The fluorescence intensity of F--tridoped samples is about 3 times that for the non F--doped sample. The fluorescence quantum efficiency can be enhanced by 21% when the atomic ratio of F to W was 0.7.展开更多
Pr^(3+)-doped transparent oxyfluoride glass-ceramic containing tetragonal LiYF_4 nanocrystals has been synthesized by melting-quenching method and subsequent thermal treatment and spectroscopic properties of Pr^(3+) i...Pr^(3+)-doped transparent oxyfluoride glass-ceramic containing tetragonal LiYF_4 nanocrystals has been synthesized by melting-quenching method and subsequent thermal treatment and spectroscopic properties of Pr^(3+) ions were investigated. The crystalline phase and microstructure of the LiYF_4 nanocrystals were studied by X-ray diffraction(XRD) and transmission electron microscopy(TEM), respectively. Compared with those of Pr^(3+)-doped glass(Pr^(3+):PG), the sharp absorption and emission bands of Pr^(3+)-doped glass-ceramic(Pr^(3+):GC) reveal parts of Pr^(3+) ions are incorporated into LiYF_4 nanocrystals. The peak absorption cross-section at 443 nm(~3H_4 → ~3P_2) adds to 110% and the full width at half maximum(FWHM) for the band around 443 nm reduces from 22 to 14 nm after crystallization. The fluorescence lifetime of the ~3P_0 multiplet of Pr^(3+) ions increases from 5.35 to 11.14 μs after crystallization. The results indicate that this glass-ceramic is promising to be a visible laser material.展开更多
A Sr3Yb2(BO3)4 single crystal was obtained by the Czochralski method. The structure of Sr3Yb2 (BO3)4 crystal was determined by single-crystal X-ray diffraction. The compound crystallizes in orthorhombic, space group P...A Sr3Yb2(BO3)4 single crystal was obtained by the Czochralski method. The structure of Sr3Yb2 (BO3)4 crystal was determined by single-crystal X-ray diffraction. The compound crystallizes in orthorhombic, space group Pnma with a=7.3750(8), b=15.9265(14), c=8.6776(9), V=1019.25(18)3 , Mr=844.18, Z=4, Dc=5.501 g/cm3 , λ(MoKa)=0.71073, μ= 33.835 mm-1 , F(000)=1480, the final R=0.0339 and wR=0.0907 for 1090 observed reflections with I>2σ(I). The structure features a three-dimensional framework composed of isolated BO3 planar triangles bridged by YbO8 and SrO8 polyhedra. The Sr2+ and Yb3+ occupy statistically three independent sites with a Cm and two C1 local symmetries.展开更多
The possible ways and progress of infrared or red laser pumped green and blue laser emissions from a single solid state material doped by rare earth ions are outlined. The green and blue lasers realized from infrared ...The possible ways and progress of infrared or red laser pumped green and blue laser emissions from a single solid state material doped by rare earth ions are outlined. The green and blue lasers realized from infrared laser pumped rare earth doped nonlinear laser crystals by means of self frequency conversion and from infrared laser pumped rare earth doped bulk, fiber and microsphere materials by means of frequency upconversion are introduced in detail. Other kinds of devices and methods are also compared. The typical nonlinear laser crystals such as YAl 3(BO 3) 4, GdAl 3(BO 3) 4, YCa 4O(BO 3) 3 , GdCa 4O(BO 3) 3, and the typical upconversion fluoride fibers are compared and analyzed. The major problems remaining to be solved and the developing trends in the area are also discussed.展开更多
The compound YbAl3(BO3)4 belongs to huntite, space group R32 with cell parameters: a = 9.251(2), c = 7.189(3) ? Z = 3, Dc = 4.574 g/cm3, F(000) = 675.0, V = 532.84 3, ?= 13.63 mm-1, (MoK? = 0.71073 ? Mr = 489.22, (YbA...The compound YbAl3(BO3)4 belongs to huntite, space group R32 with cell parameters: a = 9.251(2), c = 7.189(3) ? Z = 3, Dc = 4.574 g/cm3, F(000) = 675.0, V = 532.84 3, ?= 13.63 mm-1, (MoK? = 0.71073 ? Mr = 489.22, (YbAl3B4O12), the final R = 0.0286 and wR = 0.0710. The Yb3+ ion occupies the trigonal prismatic site and the Al3+ ion occupies the octahedral site. There are two sets of (BO3)3- planar triangles. The Yb3+ ions are connected by means of YbOAl[B(2)]Yb with the distance 5.854 ?展开更多
基金Supported by the National Natural Science Foundation of China (No. 50590405 and 50802094)the Major Programs of the Chinese Academy of Sciences (No. SZD08001-1)+1 种基金the Natural Science Foundation of Fujian Province (No. 2008J0173)the Knowledge Innovation Program of the Chinese Academy of Sciences
文摘Eye-safe 1.5～1.6 μm lasers have important applications in optical fiber communi- cation, medicine, laser-range-finding, lidar, etc. Er3+ and Yb3+ co-doped crystal pumped by diode laser around 976 nm is an attractive method for obtaining 1.5～1.6 μm laser in compact device with high output beam quality. In this paper, the recent research and progress of several important Er3+ and Yb3+ co-doped laser crystals at 1.5～1.6 μm in authors’ lab are reported.
基金Supported by the National Natural Science Foundation of China(No.51002152)the Natural Science Foundation of Fujian Province(No.2010J05125)
文摘We demonstrated that tridoping with F- ions is an effective way to improve the fluorescence quantum efficiency of CaWO4:Eu3+,Na+ nanocrystals. F--tridoped samples with different F- concentrations were synthesized by a hydrothermal process. The fluorescence spectra and decay curves were measured at room temperature. The fluorescence intensity of F--tridoped samples is about 3 times that for the non F--doped sample. The fluorescence quantum efficiency can be enhanced by 21% when the atomic ratio of F to W was 0.7.
基金supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDB20000000)
文摘Pr^(3+)-doped transparent oxyfluoride glass-ceramic containing tetragonal LiYF_4 nanocrystals has been synthesized by melting-quenching method and subsequent thermal treatment and spectroscopic properties of Pr^(3+) ions were investigated. The crystalline phase and microstructure of the LiYF_4 nanocrystals were studied by X-ray diffraction(XRD) and transmission electron microscopy(TEM), respectively. Compared with those of Pr^(3+)-doped glass(Pr^(3+):PG), the sharp absorption and emission bands of Pr^(3+)-doped glass-ceramic(Pr^(3+):GC) reveal parts of Pr^(3+) ions are incorporated into LiYF_4 nanocrystals. The peak absorption cross-section at 443 nm(~3H_4 → ~3P_2) adds to 110% and the full width at half maximum(FWHM) for the band around 443 nm reduces from 22 to 14 nm after crystallization. The fluorescence lifetime of the ~3P_0 multiplet of Pr^(3+) ions increases from 5.35 to 11.14 μs after crystallization. The results indicate that this glass-ceramic is promising to be a visible laser material.
基金Supported by the National Natural Science Foundation of China (51002152)the Natural Science Foundation of Fujian Province (2010J05125)
文摘A Sr3Yb2(BO3)4 single crystal was obtained by the Czochralski method. The structure of Sr3Yb2 (BO3)4 crystal was determined by single-crystal X-ray diffraction. The compound crystallizes in orthorhombic, space group Pnma with a=7.3750(8), b=15.9265(14), c=8.6776(9), V=1019.25(18)3 , Mr=844.18, Z=4, Dc=5.501 g/cm3 , λ(MoKa)=0.71073, μ= 33.835 mm-1 , F(000)=1480, the final R=0.0339 and wR=0.0907 for 1090 observed reflections with I>2σ(I). The structure features a three-dimensional framework composed of isolated BO3 planar triangles bridged by YbO8 and SrO8 polyhedra. The Sr2+ and Yb3+ occupy statistically three independent sites with a Cm and two C1 local symmetries.
文摘The possible ways and progress of infrared or red laser pumped green and blue laser emissions from a single solid state material doped by rare earth ions are outlined. The green and blue lasers realized from infrared laser pumped rare earth doped nonlinear laser crystals by means of self frequency conversion and from infrared laser pumped rare earth doped bulk, fiber and microsphere materials by means of frequency upconversion are introduced in detail. Other kinds of devices and methods are also compared. The typical nonlinear laser crystals such as YAl 3(BO 3) 4, GdAl 3(BO 3) 4, YCa 4O(BO 3) 3 , GdCa 4O(BO 3) 3, and the typical upconversion fluoride fibers are compared and analyzed. The major problems remaining to be solved and the developing trends in the area are also discussed.
基金The project was supported by the National Natural Science Foundation of China (No. 60088004), Chinese Academy of Sciences and the Natural Science Foundation of Fujian Province (No. F99036)
文摘The compound YbAl3(BO3)4 belongs to huntite, space group R32 with cell parameters: a = 9.251(2), c = 7.189(3) ? Z = 3, Dc = 4.574 g/cm3, F(000) = 675.0, V = 532.84 3, ?= 13.63 mm-1, (MoK? = 0.71073 ? Mr = 489.22, (YbAl3B4O12), the final R = 0.0286 and wR = 0.0710. The Yb3+ ion occupies the trigonal prismatic site and the Al3+ ion occupies the octahedral site. There are two sets of (BO3)3- planar triangles. The Yb3+ ions are connected by means of YbOAl[B(2)]Yb with the distance 5.854 ?
