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国家自然科学基金(10974055)

作品数:8 被引量:7H指数:1
相关作者:印建平钟标贾佑华陈琳石艳玲更多>>
相关机构:华东师范大学上海第二工业大学更多>>
发文基金:国家自然科学基金国家重点基础研究发展计划上海市教育委员会重点学科基金更多>>
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Tm^(3+)掺杂ZrF_4-BaF_2-LaF_3-AlF_3-NaF-PbF_2玻璃激光制冷中荧光再吸收效应的理论分析
2011年
固体材料的激光制冷是近年来发展起来的一个新的研究领域.掺Tm3+的ZrF4-BaF2-LaF3-AlF3-NaF-PbF2(ZBLANP)玻璃材料是激光冷却的典型材料之一.与另一种制冷掺杂离子Yb3+相比,Tm3+具有更好的制冷潜力.目前制约材料制冷的一个主要机理就是荧光再吸收.首先根据Tm3+:ZBLANP的光谱参数,利用半经典的随机行走模型得到了不同情况下的平均荧光再吸收次数,随后分析了荧光光子界面出射的全反射效应,并对所得结果进行了修正.计算结果表明,荧光再吸收会导致量子效率降低0.5%—1%,出射荧光波长红移达到2—10nm,激光制冷的效率和功率降低.为了有利于荧光出射和净制冷的实现,宜采用小体积细长棒的制冷元.
贾佑华钟标印建平
关键词:激光制冷稀土离子
Er^(3+)掺杂玻璃腔内增强激光冷却理论分析
2014年
近年来,掺Er3+的CdF2-CdCl2-NaF-BaF2-BaCl2-ZnF2玻璃已成为固体材料激光冷却领域中新的研究材料之一.本文利用激光器输出理论和驻波腔内共振增强原理分析了该材料的两种腔内增强激光的冷却,计算结果表明腔增强可获得几十到几百倍的增强因子.此外,比较了内腔和外腔这两种增强方案,研究结果表明,当材料的吸收比较小时,特别是材料长度小于0.3 mm时,采用内腔增强方案,腔内抽运功率高,冷却材料对激光的吸收大.然而当材料的吸收比较大时,特别是材料长度大于3 mm时,外腔增强方案更具优越性.最后,根据Er3+掺杂材料制冷工作波长和功率的要求,指出腔增强实验可通过半导体激光器来实现.
贾佑华高勇钟标印建平
Adiabatic cooling for cold polar molecules on a chip using a controllable high-efficiency electrostatic surface trap被引量:6
2014年
We propose a controllable high-efficiency electrostatic surface trap for cold polar molecules on a chip by using two insulator-embedded charged rings and a grounded conductor plate. We calculate Stark energy structure pattern of ND3 molecules in an external electric field using the method of matrix diagonalization. We analyze how the voltages that are applied to the ring electrodes affect the depth of the efficient well and the controllability of the distance between the trap center and the surface of the chip. To obtain a better understanding, we simulate the dynamical loading and trapping processes of ND3 molecules in a |J, KM = |1,-1 state by using classical Monte–Carlo method. Our study shows that the loading efficiency of our trap can reach ~ 88%. Finally, we study the adiabatic cooling of cold molecules in our surface trap by linearly lowering the potential-well depth(i.e., lowering the trapping voltage), and find that the temperature of the trapped ND3 molecules can be adiabatically cooled from 34.5 m K to ~ 5.8 m K when the trapping voltage is reduced from-35 k V to-3 k V.
李胜强许亮夏勇汪海玲印建平
关键词:CONTROLLABLE
BaF radical: A promising candidate for laser cooling and magneto-optical trapping
2017年
Recently, there have been great interest and advancement in the field of laser cooling and magneto-optical trapping of molecules. The rich internal structure of molecules naturally lends themselves to extensive and exciting applications. In this paper, the radical 138Ba19F, as a promising candidate for laser cooling and magneto-optical trapping, is discussed in detail.The highly diagonal Franck-Condon factors between theX2∑+1/2and A2∏1/2states are first confirmed with three different methods. Afterwards, with the effective Hamiltonian approach and irreducible tensor theory, the hypertine structure of theX2∑+1/2state is calculated accurately. A scheme for laser cooling is given clearly. Besides, the Zeeman effects of the upper ( A2∏1/2)andlower(X2∑+1/2)levels are also studied, and their respective g factors are obtained under a weak magnetic field. Its large g factor of the upper stateA2∏1/2is advantageous for magneto-optical trapping. Finally, by studying Stark effect of BaFin theX2∑+1/2, we investigate the dependence of the internal effective electric field on the applied electric field. It is suggested that such a laser-cooled BaF is also a promising candidate for precision measurement of electron electric dipole moment.
许亮魏斌夏勇邓联忠印建平
Mechanism of refrigeration cycle on laser cooling of solids
2012年
A simple model is developed to study the laser cooling of solids.The condition of laser cooling of a solid is developed.By using some parameters of the Yb 3+ ion,which is most widely used in laser cooling,we then calculate the cooling power and the cooling efficiency.In order to make a more precise analysis, the effect of fluorescent reabsorption,which is unavoidable in the cooling process,is discussed using the random walk model.Taking Tm 3+ ion as an example,we derive the average number of absorption events and determine the change in quantum efficiency due to reabsorption.Finally,we obtain the red-shift of the fluorescent wavelength and the requirement of sample dimension.
许将明粟荣涛肖虎周朴侯静
关键词:FLUORESCENCEYTTERBIUM
亚声速NH3分子束静电Stark减速的理论研究
2015年
本文基于自行研制的第二代(180级)静电Stark减速器,展开了对NH_3的有效减速与冷却的理论研究.首先,计算了NH_3分子在|J=1,K=1〉量子态的Stark分裂,研究了不同的同步相位角下,减速器中NH_3分子的纵向相空间稳定区域;接着,采用Monte-Carlo方法研究了该分子在传统工作模式下的减速效果,并讨论了该减速模式下多个参数(包括每级损失动能、分子波包末速度和相对减速效率)与同步相位角的依赖关系,以及减速波包末速度与减速电压的关系,研究发现:采用传统的Stark减速模式,当减速电压为±13 kV、同步相位角Φ_0=26.08°时,即可实现NH3从280 m/s到6.7 m/s的有效减速,对应平动动能减少了99.9%,其波包温度由1.34 K降至80 mK;最后,研究了先聚束后减速模式下NH3分子的减速效果,以及该减速模式下减速波包末速度与同步相位角的依赖关系,结果表明:当减速电压为±6.5 kV,采用前15级电极作为聚束电极,后165级作为减速电极时,可将NH3分子波包的中心速度由280 m/s减至20.7 m/s,平动动能减少了99.4%,温度由1.34 K降至1.6 mK,与传统减速模式相比,冷分子波包温度降低至1/50.由此可见,采用180级的传统Stark减速器完全可以实现具有较低Stark势能的NH3分子的有效减速与冷却,并获得温度约为1mK的冷分子波包,为进一步的实验研究提供了可靠的理论依据.
刘建平侯顺永魏斌印建平
关键词:氨分子
Cooling and trapping polar molecules in an electrostatic trap被引量:1
2015年
An electrostatic trap for polar molecules is proposed. Loading and trapping of polar molecules can be realized by applying different voltages to the two electrodes of the trap. For ND3 molecular beams centered at -10 m/s, a high loading efficiency of -67% can be obtained, as confirmed by our Monte Carlo simulations. The volume of our trap is as large as ,-3.6 cm3, suitable for study of the adiabatic cooling of trapped molecules. Our simulations indicate that trapped ND3 molecules can be cooled from -23.3 mK to 1.47 mK by reducing the trapping voltages on the electrodes from 50.0 kV to 1.00 kV.
王振霞顾振兴邓联忠印建平
1015nm半导体激光放大系统的实验研究被引量:1
2015年
报道了波长为1015 nm的大功率单频半导体光放大器的设计与研制,实验研究了不同注入光功率和不同温度下,放大器输出光功率与注入电流的依赖关系。结果表明:当波长为1015 nm、功率约为30 m W的种子光注入到半导体激光放大系统中,并把该放大器的注入电流增加到5 A时,其输出的激光功率高达1600 m W,相应的放大倍数可达17.3 d B,且放大器输出功率随温度的降低而增大。此外,还观测了半导体光放大器输出功率的稳定性,发现该放大器可长时间保持稳定工作。因此,该1015 nm激光放大系统可用于掺杂稀土离子晶体的激光冷却,四倍频后还可用于汞原子光钟的实验研究。
陈琳钟标夏勇郑公爵石艳玲印建平
关键词:激光光学半导体激光器
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