Analysis of influence of RF power and buffer gas pressure on sensitivity of optically pumped cesium magnetometer

A further study is conducted on two factors which respectively influence the sensitivity of optically pumped cesium magnetometer （CsOPM）. The influence of radio frequency （RF） power and the buffer gas pressure on the sensitivity is theoretically analyzed, and some properties are predicted. Based on the established measurement system and the visible Zeeman spectrum, not only is the real influence of these factors studied, but also, under our experimental condition, optimum parameters based on the measured curves are ascertained. The properties of these measured curves match the theoretical result very well. Our research attempts to provide theory reference to help magnetometer designers determine optimum parameters under certain conditions.     

铯原子调制转移光谱在激光稳频中的应用

利用铯原子D₂线的调制转移光谱的鉴频特性,实现了光栅外腔式主振荡器-功率放大型(MOPA)半导体激光器相对于铯原子6²S_1/2F=4→6²P_3/2 F’=5超精细跃迁的偏频锁定,在100 ms内激光频率的相对起伏小于±280 kHz.相对于一般的饱和吸收锁频方法而言,调制转移光谱在锁频中的应用不仅彻底消除了Doppler背景对锁频的影响,而且还避免了对激光器直接进行频率扰动而带来的附加频率噪音.     

双抽运光作用电磁感应透明的实验研究

主要研究抽运光的强度对V型铯原子三能级系统电磁感应透明的影响，同时研究了双抽运光作用对电磁感应透明的影响，并利用光与原子作用的密度矩阵加以解释.实验结果与理论计算相符. 关键词： 电磁感应透明 双抽运 铯原子     

萃取分离-石墨炉原子吸收光谱法测定盐卤中痕量铯的研究

采用墨炉原子吸收光谱法（ＧＦＡＡＳ）研究盐卤中铯原子化行为和机理,建立了热解石墨管、ＫＮＯ３－ＮＨ４ＮＯ３基体改进剂、１８－冠－６、溴百里香酚蓝、氯仿萃取分离－ＧＦＡＡＳ测定盐卤中铯的方法。用于测定盐卤中痕量铯,特征质量１．４×１０－１０ｇ／０．００４４Ａ;加标回收率８９％～１０５％;相对标准偏差４．１３％。     

A novel 852-nm tunable fiber laser

We report a novel fiber laser operating at 850-nm band by using semiconductor optical amplifier and fiber grating. The laser system is stable, compact, and the operating wavelength can be tuned continuously from about 851 to 854 nm for Cs atomic clock system by stretching the fiber grating. An output power up to 20 mW is obtained with a signal-to-background ratio beyond 20 dB.     

Creation of an Ultracold Plasma by Photoionizing Laser-Cooled Caesium Atom

The signals of ultracold plasma are observed by two-photon ionization of laser-cooled atom in a caesium magneto-optical trap. A simple model has been introduced to explain the creation of plasma, and the mechanism is further investigated by changing the energy of a pulsed dye laser and the number of initial cooled atoms.     

铯氧比对砷化镓光电阴极激活结果的影响

实验和理论分析结果表明,激活成功的砷化镓光电阴极的铯氧比存在一个最佳值.砷化镓光电阴极铯氧比的控制可通过调节激活过程中铯源和氧源的加热电流大小来实现.激活实验结果表明,铯氧电流比适中的样品,首次进氧时,光电流上升速度最快,激活后的阴极量子效率最高,稳定性好.当偏离这个比例,过大或过小时,光电流上升速度都会减慢,激活结果也比前者差.随着铯氧电流比的增大,铯氧交替的总次数随之减少.最佳铯氧电流比的调节应以首次进氧时光电流的上升速度最快为准,一旦确定后在整个铯氧交替过程中保持不变.     

铯离子/原子与金属表面电荷交换的计算

用Ｎｅｗｎｓ－Ａｎｄｅｒｓｏｎ量子模型，计算了低能铯离子与涂有铯原子的钨表面（Ｃｓ／ｗ（１１０））碰撞时，由于电荷交换引起的末态电荷态的分布与Ｃｓ／Ｗ（１１０）表面功函数及表面温度的关系，计算结果与相应的实验符合得较好。同时，也给出了铯离子和原子与Ｃｓ／Ｗ（１１０）表面相互作用过程中粒子电荷态变化的全过程，并对两者作了比较． 关键词：     

多组分钒铯铜铊催化剂的表面氧性质研究

通过浸渍法制备了一系列选择氧化制取对频丁基苯甲醛的催化剂,采用O2-TPD、TPR表征技术考察了催化剂的表面氧和晶格氧的热脱附性能以及还原性能。实验结果表明助剂Cu、T1的添加对催化剂表面氧性质影响较大,并发现催化剂的表面氧性质与其反应性能有很好的对应关系。