Catalyzed by ytterbium（III） triflate hydrate [Yb（OTf）3.xH20], the Michael addition and cyclocondensation of α,β-unsaturated ketones with active methylene compounds to afford the 1,4-adducts and benzo[b]pyran der...Catalyzed by ytterbium（III） triflate hydrate [Yb（OTf）3.xH20], the Michael addition and cyclocondensation of α,β-unsaturated ketones with active methylene compounds to afford the 1,4-adducts and benzo[b]pyran derivatives, respectively were studied.展开更多
The reaction of anhydrous YbCl3 with LiNPri2 in 1:3 molar ratio gave the homo- leptic lanthanide amide ate complex Yb(C6H14N)4Li(C4H8O). The crystal structure was determined by X-ray diffraction and the following crys...The reaction of anhydrous YbCl3 with LiNPri2 in 1:3 molar ratio gave the homo- leptic lanthanide amide ate complex Yb(C6H14N)4Li(C4H8O). The crystal structure was determined by X-ray diffraction and the following crystallographic data were obtained: C28H64N4OYbLi, Mg = 652.82, monoclinic, P21/c (#14), a = 15.239(3), b = 21.502(6), c = 21.288(4) ? b = 93.18(2), V = 6964(2) 3, Z = 8, Dc = 1.245 g/cm3, F(000) = 2728 and m(MoKa) = 27.08 cm-1. The final R and Rw are 0.044 and 0.053 for 6765 observed reflections with I > 3.00s(I), respectively. The ytterbium atom is bonded to two terminal amide ligands with the normal YbN distances of 2.171(6) and 2.174(7) ? and two bridging amide ligands with the YbN bonds about 0.1 ?longer than those of the formers, forming a distorted tetrahedral geometry.展开更多
A novel 3D ytterbium supramolecular compound, [Yb（HBDDC）（H20）4]·2H2O（1）, was synthesized via 5,5＇-（buta-diyne-1,4-diyl）diisophthalic acid ligand（HaBDDC） under solvothermal conditions. Single-crystal X-...A novel 3D ytterbium supramolecular compound, [Yb（HBDDC）（H20）4]·2H2O（1）, was synthesized via 5,5＇-（buta-diyne-1,4-diyl）diisophthalic acid ligand（HaBDDC） under solvothermal conditions. Single-crystal X-ray diffraction analysis reveals that compound 1 crystallizes in triclinic system, PT space group with a=0.71372（14） nm, b=1.0566（2） nm, c=1.7969（4） nm, a=101.01（3）°, β=98.15（3）°, γ=99.17（3）° and V=1.2922（4） nm3. Compound 1 exhi- bits a special infinite 1D chain, which stacks parallel each other in an ABAB sequence, leading to the formation of a 3D supramolecular structure owing to the strong π-π interactions between adjacent phenyl ring groups. Moreover, compound 1 manifests excellent luminescent property.展开更多
Ytterbium-doped yttrium oxysulfide （Yb：Y2O2S） has been synthesized by solid-state reaction with sulfide flux. Diffuse reflection and emission spectra have been measured in order to determine the crystal field split...Ytterbium-doped yttrium oxysulfide （Yb：Y2O2S） has been synthesized by solid-state reaction with sulfide flux. Diffuse reflection and emission spectra have been measured in order to determine the crystal field splitting of Yb^3＋ ion in the YOS lattice. According to the crystal-field levels probed in the spectra, the crystal field splitting of 2F7/2 manifold of Yb^3＋ ion in YOS is 709 cm^-1, which is large enough for the quasi-three-level laser operation of Yb^3＋ ion. Emission peak position, width, full-width at half maximum （FWHM）, and normalized intensity of Yb：YOS are fitted from its emission spectrum. For comparison, relevant data of 5.4 at.-% Yb：YAG is also provided.展开更多
A ytterbium-doped double-clad fiber laser with more than 50-W output, near diffraction-limited is demonstrated in SIOM. The optical-to-optical efficiency is about 44% with respect to incident pump power and the slope ...A ytterbium-doped double-clad fiber laser with more than 50-W output, near diffraction-limited is demonstrated in SIOM. The optical-to-optical efficiency is about 44% with respect to incident pump power and the slope efficiency is 69% against launched pump power.展开更多
A passive mode-locked diode-pumped self-frequency-doubling Yb:YAB laser with a low modulation depth semiconductor saturable absorber mirror operating at 374 MHz is demonstrated. The measured pulse duration is 1.98 ps ...A passive mode-locked diode-pumped self-frequency-doubling Yb:YAB laser with a low modulation depth semiconductor saturable absorber mirror operating at 374 MHz is demonstrated. The measured pulse duration is 1.98 ps at the wavelength of 1044 nm. The maximum average power reaches 45 mW.展开更多
We reported a passive Q-switched diode laser pumped Yb: YAG microchip laser with an ion-implanted semi-insulating GaAs wafer. The wafer was implanted with 400-keV As+ in the concentration of 1016 ions/cm2. To decrease...We reported a passive Q-switched diode laser pumped Yb: YAG microchip laser with an ion-implanted semi-insulating GaAs wafer. The wafer was implanted with 400-keV As+ in the concentration of 1016 ions/cm2. To decrease the non-saturable loss, we annealed the ion-implanted GaAs at 500℃ for 5 minutes and coated both sides of the ion-implanted GaAs with antireflection (AR) and high reflection (HR) films, respectively. Using GaAs wafer as an absorber and an output coupler, we obtained 52-ns pulse duration of single pulse.展开更多
The distribution of pump light and signal light in Yb3+-doped double-cladding fiber laser is analyzed based on a rate equation model. Numerical simulation results are obtained. The numerical solution of the rate equat...The distribution of pump light and signal light in Yb3+-doped double-cladding fiber laser is analyzed based on a rate equation model. Numerical simulation results are obtained. The numerical solution of the rate equation is shown to be in excellent agreement with the experimental data.展开更多
基金the National Natural Science Foundation of China (No.20676123) for financial support.
文摘Catalyzed by ytterbium（III） triflate hydrate [Yb（OTf）3.xH20], the Michael addition and cyclocondensation of α,β-unsaturated ketones with active methylene compounds to afford the 1,4-adducts and benzo[b]pyran derivatives, respectively were studied.
基金Supported by the National Natural Science Foundation of China (20072027) Department of Education of Jiangsu province and the Key Laboratory of Organic Synthesis of Jiangsu province
文摘The reaction of anhydrous YbCl3 with LiNPri2 in 1:3 molar ratio gave the homo- leptic lanthanide amide ate complex Yb(C6H14N)4Li(C4H8O). The crystal structure was determined by X-ray diffraction and the following crystallographic data were obtained: C28H64N4OYbLi, Mg = 652.82, monoclinic, P21/c (#14), a = 15.239(3), b = 21.502(6), c = 21.288(4) ? b = 93.18(2), V = 6964(2) 3, Z = 8, Dc = 1.245 g/cm3, F(000) = 2728 and m(MoKa) = 27.08 cm-1. The final R and Rw are 0.044 and 0.053 for 6765 observed reflections with I > 3.00s(I), respectively. The ytterbium atom is bonded to two terminal amide ligands with the normal YbN distances of 2.171(6) and 2.174(7) ? and two bridging amide ligands with the YbN bonds about 0.1 ?longer than those of the formers, forming a distorted tetrahedral geometry.
基金Supported by the National Natural Science Foundation of China（No.20701015）.
文摘A novel 3D ytterbium supramolecular compound, [Yb（HBDDC）（H20）4]·2H2O（1）, was synthesized via 5,5＇-（buta-diyne-1,4-diyl）diisophthalic acid ligand（HaBDDC） under solvothermal conditions. Single-crystal X-ray diffraction analysis reveals that compound 1 crystallizes in triclinic system, PT space group with a=0.71372（14） nm, b=1.0566（2） nm, c=1.7969（4） nm, a=101.01（3）°, β=98.15（3）°, γ=99.17（3）° and V=1.2922（4） nm3. Compound 1 exhi- bits a special infinite 1D chain, which stacks parallel each other in an ABAB sequence, leading to the formation of a 3D supramolecular structure owing to the strong π-π interactions between adjacent phenyl ring groups. Moreover, compound 1 manifests excellent luminescent property.
文摘Ytterbium-doped yttrium oxysulfide （Yb：Y2O2S） has been synthesized by solid-state reaction with sulfide flux. Diffuse reflection and emission spectra have been measured in order to determine the crystal field splitting of Yb^3＋ ion in the YOS lattice. According to the crystal-field levels probed in the spectra, the crystal field splitting of 2F7/2 manifold of Yb^3＋ ion in YOS is 709 cm^-1, which is large enough for the quasi-three-level laser operation of Yb^3＋ ion. Emission peak position, width, full-width at half maximum （FWHM）, and normalized intensity of Yb：YOS are fitted from its emission spectrum. For comparison, relevant data of 5.4 at.-% Yb：YAG is also provided.
基金This work was supported by the National Natural Sci- ence Foundation of China(No.60244005)by the Chinese Academy of Science,and partly by the shanghai science&Technology Foundations,
文摘A ytterbium-doped double-clad fiber laser with more than 50-W output, near diffraction-limited is demonstrated in SIOM. The optical-to-optical efficiency is about 44% with respect to incident pump power and the slope efficiency is 69% against launched pump power.
基金work was supported by the National Key Basic Research Special Foundation of China (No. G1999075201-2)the National Natural Science Foundation of China (No. 69978007, 60178008).
文摘A passive mode-locked diode-pumped self-frequency-doubling Yb:YAB laser with a low modulation depth semiconductor saturable absorber mirror operating at 374 MHz is demonstrated. The measured pulse duration is 1.98 ps at the wavelength of 1044 nm. The maximum average power reaches 45 mW.
文摘We reported a passive Q-switched diode laser pumped Yb: YAG microchip laser with an ion-implanted semi-insulating GaAs wafer. The wafer was implanted with 400-keV As+ in the concentration of 1016 ions/cm2. To decrease the non-saturable loss, we annealed the ion-implanted GaAs at 500℃ for 5 minutes and coated both sides of the ion-implanted GaAs with antireflection (AR) and high reflection (HR) films, respectively. Using GaAs wafer as an absorber and an output coupler, we obtained 52-ns pulse duration of single pulse.
基金This project was supported by Tunable Laser State Key Lab on Harbin Institute of Technology under Grant No. 51472030301JW1401.
文摘The distribution of pump light and signal light in Yb3+-doped double-cladding fiber laser is analyzed based on a rate equation model. Numerical simulation results are obtained. The numerical solution of the rate equation is shown to be in excellent agreement with the experimental data.
