Highly efficient Nd:YAG ceramic CW laser with 59.8% slope-efficiency

In this paper, a highly efficient Ti:sapphire end-pumped 1 at.-% Nd:YAG ceramic laser that is comparable in efficiency with Nd:YAG single crystal lasers has been developed. Optical absorption and emission spectra for Nd:YAG ceramics have been measured. With 673-mW pumping, 295-mW laser output at 1064 nm has been obtained. The laser threshold is only 13 mW. Deducted the transmitted light, the corresponding optical-to-optical conversion efficiency is 58.4%. The lasing characteristics of Nd:YAG ceramic are nearly equal to those of Nd:YAG single crystal.

The influence of Mozart's sonata K.448 on visual attention: An ERPs study

In the present study, the effects of Mozart's sonata K.448 on voluntary and involuntary attention were investigated by recording and analyzing behavioral and event-related potentials (ERPs) data in a three-stimulus visual oddball task. P3a (related to inv

~(59)Co~(2+)对~1H与~(35)Cl的NMR影响

<正> 在前文的基础上,用~(59)CO~2+Cl_2·6H_2O加D_2O作为样品,在200MHz谱仪上观察~1H,在400MHz谱仪上观察~(35)Cl,研究强顺磁离子~(59)Co~2+(s=3/2,I=7/2)在外加直流磁场H_0作用下,它对~1H与~(35)Cl的NMR影响。因为强顺磁离子~(59)Co~(2+)的电子自旋(s=3/2)是围绕着核旋转的,因此可以统计平均计算,

GaAs-based room-temperature continuous-wave 1.59 mu m GaInNAsSb single-quantum-well laser diode grown by molecular-beam epitaxy

Starting from the growth of high-quality 1.3 mu m GaInNAs/GaAs quantum well (QW), the QW emission wavelength has been extended up to 1.55 mu m by a combination of lowering growth rate, using GaNAs barriers and incorporating some amount of Sb. The photoluminescence properties of 1.5 mu m range GaInNAsSb/GaNAs QWs are quite comparable to the 1.3 mu m QWs, revealing positive effect of Sb on improving the optical quality of the QWs. A 1.59 mu m lasing of a GaInNAsSb/GaNAs single-QW laser diode is obtained under continuous current injection at room temperature. The threshold current density is 2.6 kA/cm(2) with as-cleaved facet mirrors. (c) 2005 American Institute of Physics.

94.5Mev ~(14)N+~(59)Co反应系统准弹及深度非弹研究

通过对94.5 Mev ~(14)N+~(59)Co反应数据的处理，得到了Li-Ne产物出射的wilczynski图、角分布、电荷分布，并对它们做了一些常规的分析工作。在Feldmeier模型框架下对该系统作了经典轨道动力学计算，给出了计算结果并对它们做了说明。本工作为轻系统低轰击能量下周边碰撞的系统性研究提供了一些参考数据

偏硅酸镉的自激活发光

利用高温固相法合成了一种具有自激活发光行为的CdSiO3基质.对样品进行了X射线衍射分析和光谱分析.光谱分析结果表明,在偏硅酸镉的发射光谱中存在三个自激活发光峰,它们分别位于380,467和560nm处,另外,通过热释光谱技术讨论了偏硅酸镉中的缺陷及相关机理.在热释光谱中有两个明显的热释峰,分别位于448和563K,它们的陷阱深度分别为0 58和0 61eV,表明了在偏硅酸镉中存在着不同的陷阱,这些陷阱的存在导致了偏硅酸镉的自激活发光.

THE CLEAVAGE REACTION OF THE MO-MO TRIPLE BOND - THE CRYSTAL-STRUCTURES OF MOLYBDENUM COMPLEXES [CPMO(CO)(2)(C(5)H(4)NS)], [CPMO(CO)(2)(C(9)H(6)NS)]O=PPH(3) AND [CPMO(CO)(2)(S(2)CNME(2)]

The reactions of [Cp2Mo2(CO)4] (1) with 2,2'-dipyridyl disulphide (C5H4NS-)2, 8,8'-diquinolyl disulphide (C9H6NS-)2 and tetramethyl thiuram disulphide (Me2NC(S)S-)2 in toluene solution resulted in the cleavage of the Mo-Mo triple bond to yield molybdenum complexes [CpMo(CO)2(C5H4NS)] (2), [CpMo(CO)2(C9H6NS)] (3) and [CpMo(CO)2(S2CNMe2)] (4), respectively. The molecular structures of 2, 3 . O=PPh3 and 4 were determined by X-ray diffraction studies. Crystals of 2 are monoclinic, space group P2(1)/n, with Z = 4, in a unit cell of dimensions a = 6.448(1), b = 12.616(2), c = 14.772(2) angstrom, beta = 92.85(1)-degrees. The structure was refined to R = 0.028 and R(w) = 0.039 for 1357 observed reflections. Crystals of 3 . O=PPh3 are triclinic, space group P1BAR, with Z = 2, in a unit cell of dimensions a = 11.351(3), b = 13.409(3), c = 9.895(2) angstrom, alpha = 94.59(2), beta = 90.35(2), gamma = 78.07(2)-degrees. The structure was refined to R = 0.033 and R(w) = 0.037 for 3260 observed reflections. Crystals of 4 are monoclinic, space group P2(1)/a and Z = 4 with a = 12.468(5), b = 7.637(2), c = 13.135(4) angstrom, beta = 96.62(3). The structure was refined to R = 0.032 and R(w) = 0.042 for 1698 observed reflections. Each of complexes 2-4 contains a cyclopentadienyl ligand, a cis pair of carbonyls and a chelate ligand (S,N donor or S,S donor). All the compounds have distorted square-pyramid structures.

高产节水春小麦新品种--高原448

高原448是中国科学院西北高原生物研究所采用有性杂交方法选育而成的,其系谱是:青春533/高原602.原代号为94-448,1999年11月通过青海省农作物品种审定委员会审定,定名为高原448.该品种现已成为青海省灌区种植的主要品种之一,是青海省农作物品种审定委员会指定的全省灌区小麦区域试验和生产试验的对照品种.