利用啁啾光纤光栅色散特性实现波长可调谐的主动锁模掺铒光纤环行腔激光器

在环形腔主动锁模光纤激光器中引入啁啾光纤光栅，利用啁啾光纤光栅的大色散特性，通过调节调制频率，实现波长调谐，调谐范围2nm。所得脉冲为重复频率2．5GHz，脉宽约60ps的正啁啾脉冲，。     

自发喇曼成像法在线测量流场组分浓度(II)

 介绍了利用自发Raman散射光谱测量低压气流组分绝对浓度的方法，在流动状态下得到了不同压力下的自发喇曼散射光谱，检测最低压力为133帕；对于含N₂氧气流在已知N₂浓度时实时标定检测了O₂的绝对浓度，测量误差小于8%。     

An Exact Solution and the Pancharatnam Phase for the Generalized Two—Mode Optical System

Using the algebraic dynamical method,we obtain the exact solution for the generalized two-mode optical system.From the solution,the Pancharatnam phase and the mean values of the number operators of the system are calculated.It is emphasized that the system can be used as a quantum memory.     

Pressure—Induced Shifts of Energy Spectra of α—Al2O3：Mn^4＋

By making use of the diagonalization of the complete d^3 energy matriz in a trigonally distorted cubic-field and the theory of pressure-induced shifts (PS) of energy spectra,the whole energy spectrum of α-Al2O3:Mn^4 and PS of levels have been calculated.All the calculated results are in excdellent agreement with the experimental data.The comparison between the results of α-Al2O3:Mn^4 and ruby has been made.It is found that on one hand,R1-line and R2-line PS of α-Al2O3:Mn^4 and ruby are linear in pressure over 0-100 kbar,and their values of the principal parameter for PS are very close to each other.On the other hand,the sensitivities of R1-line and R2-line PS of α-Al2O3:Mn^4 are higher than those of ruby respectively,which comes mainly from the difference between the values of parameters at normal pressure of two crystals;moreover,the expansion of d-electron wavefunctions of α-Al2O3:Mn^4 with compression is slightly larger than the one of ruby,and the effective charge experienced by d-electrons of α-Al2O3:Mn^4 decreases with compression more rapidly than the one of ruby.In the final analysis,all these can be explained in terms of the facts that the two crystals are doped α-Al2O3 with two isoelectronic ions;the strengths of the crystal field and covalency of α-Al2O3:Mn^4 are larger than those of ruby respectively,due to the charge of Mn^4 to be larger than that of Cr^3 .     

NETWORK CROWN ETHER POLYMERS WITH CENTRIC FUNCTIONAL GROUPS.Ⅱ.SYNTHESIS OF NETROWK CROWN ETHER POLYMER WITH PENDANT SULFIDE SIDE CHAIN AND ITS PLATINUM COMPLEX

Network crown ether polymer with pendant sulfide side chain in the network structure units has been synthesized via ring-opening copolymerization of β-ethylthioethyl glycidyl ether and diethylene glycol bisglycidyl ether.A kind of active catalyst suitable for this reaction was suggested.The title polymer was found to be a good ligand for platinous chloride,and the platinous complex could catalyze the hydrosilylation of ole fins with triethoxysilane efficiently.     

形变双奇核^180Ir的高自旋态的实验研究

利用^154Sm(^31P,5nγ)^180Ir反应产生并研究了双奇核^180Ir的高自旋态，实验中进行了^180Ir核的在束γ测量，包括γ射线的激发函数测量、X-γ和γ-γ符合测量，首次建立了双奇核^180Ir由5个转动带构成的能级钢图，依据从实验数据中提取出的带内B（M1）／B（E2）值与理论计算值的比较，以及相邻双奇核的带结构特征，给出了转动带的准粒子组态，在推转壳模型的理论框架中，定性地讨论了转动带结构特征的组态依赖性。     

Soluble Polymer—supported Synthesis of Indoles via Palladium—mediated Heteroannulation of Terminal Alkynes with o—Iodoanilines

A soluble polymer-supported synthesis of indoles via palladium-mediated heteroannulation of terminal alkynes with o-iodoanilines has been described. The protocol provides a useful tool for constructing combinatorial indole libraries.     

Effect of Emitter Position on Emission Intensity in an Organic Planar Microcavity

We have fabricated a λ/2-length planar microcavity between two silver mirrors that had the same thickness and consisted of a sandwich structure LiF1/Alq3/LiF2.By altering the relative thickness of the two LiF layers,the adjustment of the position of thin layer Alq3 in the microcavity was achieved and the apparent photoluminescence (PL) intensity change was observed.The maximal emission intensity device,corresponding to the luminescence layer located at antinode,is four times that of the minimal one whose luminescence layer is near a silver mirror that is close to a node.This indicates that the coupling between vacuum electric field and dipole strongly affects the emission intensity in the forward direction of the microcavity plane.Comparing the PL intensity between the microcavity and the non-cavity devices with the same sandwith structure LiF1/Alq3/LiF2 in free space,at the resonance wavelength a maximal enhancement factor of nine is obtained.