三核钼簇合物H[H2O]3[Mo3O(OAc)I3Cl6]的合成分子结构及红外光谱归属的研究

本文报道MoCl3.3H2O与乙酸作用生成三核钼簇合物H[H2O]3[Mo3O(OAc)3Cl6]的反应, 并用X射线单晶结构分析方法测定了簇合物的晶体结构, 结晶学参数. 结构分析结果表明该化合物阴离子为单氧帽等边三角形三核钼簇合阴离子, Mo-Mo平均距离2.569埃.对簇骼单元[Mo3O(μ-Cl)3Cl3]^2^+进行简正坐标分析. 从理论上对振动光谱谱带进行了归属. 10条IR谱带的观测和计算频率的平均偏差为1.15%. 本文讨论了特征谱带(包括金属键)的归属和力常数的合理性.     

闪耀光栅弱反馈GaAlAs单模半导体激光器的频率调谐特性

对于单模ＧａＡｌＡｓ半导体激光器,使用一种简单的闪耀光栅外部弱反馈构型,迫使其工作在８５２．１１ｎｍ波长处,得到了２．２ＧＨｚ的频率连续调谐范围,获得的输出功率约为半导体激光器自由运转时的９０％以上。     

由NOPA产生高质量明亮压缩光及明亮EPR光束

通过非简并光学参量放大器获得了明亮双模正交压缩光及明亮EPR光束.实验测得明亮耦合模的正交振幅压缩为57±02dB;信号模与闲置模的正交振幅和(正交位相差)的起伏低于散粒噪声极限54±02dB(54±02dB),EPR关联的乘积为0332±0003. 关键词： 明亮双模正交压缩光 明亮EPR光束 非简并光学参量放大器     

利用周期性极化KTiOPO4晶体参量缩小过程产生明亮振幅压缩光

利用周期性极化KTiOPO4晶体构成的连续准相位匹配简并光学参量缩小谐振腔,获得了注入红外的明亮正交振幅压缩光.参量振荡阈值为35 mW.当抽运光功率为20mW时,测得压缩度为2.23dB,特别是当抽运光功率为8mW时,测得压缩度为2.17dB.     

连续可调谐OPO及其在Cs_2分子频率调制光谱中的应用

采用边带锁频技术 ,在II类相位匹配半整体光学参量振荡器 (OPO)中实现双谐振OPO稳定单频运转 ,通过调谐抽运光频实现OPO输出连续可调谐 ,最大连续调谐范围 2 .8GHz,将其应用于Cs2 分子的频率调制光谱 ,观测到室温附近Cs2 分子气室样品在 10 41.5 0 6nm附近的高分辨率光谱     

连续变量四组份纠缠态光场的产生

以一对工作在参量反放大状态的非简并光学参量放大器同时产生的两个正交振幅压缩相干态与两个正交位相压缩真空态光场为基础，经过不同位相关系的线性光学变换，可获得四组份纠缠态光场。我们将介绍实验原理和初步试验结果。     

Frequency-stabilized semimonolithic frequency doubler with high output power

The frequency-doubled Nd:YAP laser with high out- put power is an important pumping source for quan- tum information, quantum optics, and nonlinear optics experiments[1-6]. Intracavity frequency-doubled[7-11] and external frequency-doubled lasers[12-18] are two usual methods to generate continuous second harmonic wave. For the former, the frequency-doubling nonlinear crystal and the active medium of the laser are put in the same resonant cavity, thus the process of frequency doubling possibly…     

Photon Statistics of Single-Photon Quantum States in Real Single Photon Detection

Single photon detection (SPD) with high quantum efficiency has been widely used for measurement of different quantum states with different photon distributions.Based on the direct single SPD and double-SPD of HBT configuration, we discuss the effect of a real SPD on the photon statistics measurement and it shows that the measured photon distributions for different quantum states are corrected in different forms.The results are confirmed by experiment with the strongly attenuated coherent light and thermal light.This system can be used to characterize the photon statistics of the fluorescence light from single atom or single molecular.     

Improving frequency stability of laser by means of temperature-controlled Fabry-Perot cavity

The frequency stability of an all-solid-state Nd:YVO4 laser is significantly improved by means of a specially designed Fabry-Perot (F-P) interferometer used for the frequency standard in the frequency-stabilizing system. The ten.peraturo of the F-P cavity is accurately controlled by a set of thermoelectric cooler (TEC) modules attached on th dy of the cavity and the electronic feedback circuit. We find that the long-term unidirectional frequency shift of the output laser, resulting from the slow increase of the cavity length under the effect of the temperature integration on the cavity body, is essentially eliminated. The frequency stability of the output laser with the power of 530 mW is better than ±200 kHz in 1 minute and ±2.3 MHz iu 40 minutes, respectively. The fluctuation of output power is smaller than ±0.5% over one hour.     

频率可调谐的非经典光场的产生及其在FM光谱中的应用

利用Ⅱ类相位匹配KTP晶体组成的双共振OPO,实现了可调谐连续OPO单频运转,最大输出功率360mW,波长调谐范围大于9nm.在此基础上,进一步利用α切割KTP晶体获得了输出波长可调谐的强度关联孪生光束,调谐范围大于5nm,最大量子关联大于5dB.将此非经典光场用于Cs2频率调制光谱测量,获得了突破散粒噪声极限4dB的测量结果,在室温下观测到了Cs2在1041nm、1065nm的吸收谱.