共查询到16条相似文献,搜索用时 156 毫秒
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提出了一种采用Damman光栅和球面透镜组合光学系统产生二维光阱阵列的新方案. 在使用红失谐高斯激光束照射的条件下,推导了计算光阱阵列的周期、光强分布、光强梯度和光阱几何参数的经验公式,讨论了此光阱阵列的特点以及在原子光学和分子光学中的应用. 研究结果表明,这种光阱阵列方案比已有的光阱阵列方案更为简单可行、操作方便,非常适用于冷原子或冷分子的阵列囚禁,以及制备新颖的光学晶格.
关键词:
冷原子或冷分子
光阱阵列
Damman光栅
光偶极势 相似文献
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提出了一种采用两套超大红失谐消逝波干涉和一束蓝失谐消逝波光场来实现原子二维表面微光阱阵列和原子有效强度梯度冷却的新方案,得到了二维表面微光阱阵列的光强分布和光学势分布.研究发现,二维表面微光阱阵列中微光阱的光学势能够有效地囚禁从标准磁光阱中释放的冷原子,并且被囚禁的冷原子能在蓝失谐消逝波光场的作用下产生有效的强度梯度Sisyphus冷却,对87Rb原子而言,原子温度能被冷却到2.56μK.该方案在冷原子物理、原子光学和量子光学领域中有着广阔的应用前景.
关键词:
消逝波干涉
微光阱阵列
原子囚禁
强度梯度冷却 相似文献
3.
本文提出了一种采用Damman光栅和球面透镜组合光学系统产生二维光阱阵列的新方案。在使用红失谐高斯激光束照射的条件下,我们推导了计算光阱阵列的周期、光强分布、光强梯度和光阱几何参数的经验公式,讨论了此光阱阵列的特点以及在原子光学和分子光学中的应用。研究结果表明:这种光阱阵列方案比已有的光阱阵列方案更为简单可行、操作方便,非常适用于冷原子或冷分子的阵列囚禁,以及制备新颖的光学晶格。 相似文献
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提出了用相位型错位光栅产生光学双阱的新方案.用平面光波(或TEM00模式高斯光波)照射、正透镜聚焦,在透镜焦平面上产生的适用于冷原子或冷分子囚禁的多对可调光学双阱.计算和推导了双阱的光强分布、强度梯度以及光阱的几何参数与光学系统参数间的解析关系,研究了双阱到单阱三种不同的演化过程.同时还计算了光学双阱囚禁冷原子的光学偶极势和光子散射速率.研究发现,该方案不仅简单可行、操作方便,而且在原子物理、原子光学、分子光学和量子光学领域中有着广阔的应用前景.
关键词:
原子光学
相位光栅
光学双阱
冷原子囚禁 相似文献
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提出了一种新颖的实现冷原子(或冷分子)囚禁的可控制纵向光学双阱方案,它由一个二元π相位板及一会聚透镜所组成,其π相位板由两个面积相等的具有0和π相位的同心圆环组成. 当一平面光波通过此光学系统时将在光轴上透镜焦点两侧形成一个光学双阱,如果调节入射到二元π相位板上光束横截面的半径大小,即可实现从光学双阱到单阱的连续演变,或由单阱到双阱的连续变化. 介绍了本方案产生可控制光学双阱的基本原理,给出了形成光学双阱的最佳几何参数,研究了双阱、单阱及其演化过程的光阱参数、光强分布等与光学系统参数间的关系. 该方案不仅可用于双样品原子(分子)的光学囚禁及其全光型玻色-爱因斯坦凝聚(BEC)的实现,而且可用于研究超冷原子(或分子)物质波的干涉,或构成双层2D光阱列阵,甚至用于制备新颖的双层2D光学晶格.
关键词:
二元π相位板
可控制光学双阱
双样品囚禁
光学晶格 相似文献
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本文提出了用液晶空间光调制器制作复合相位光栅、产生三维光阱阵列的新方案.在本方案中,首先将一维矩形光栅转变为能够产生纵向光阱阵列的环形光栅,再把环形光栅和二维矩形光栅组合成复合光栅.根据现有空间光调制器的技术参数,模拟仿真设计了产生5×5×5光阱阵列的光栅,以普通功率的高斯光波为输入光,正透镜聚焦衍射光,计算输出光强分布,结果表明:在透镜焦点附近获得具有很高峰值光强和光强梯度的三维光阱阵列,囚禁冷原子的光学偶极势达到mK量级,对原子的作用力远大于原子的重力.用大功率激光作为输入光波时,产生的光阱阵列也能用于囚禁Stark减速后的冷分子. 相似文献
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We propose a novel scheme of optical confinement for atoms by using a concave grating reflector.The two-dimension grating structure with a concave surface shape exhibits strong focusing ability under radially polarized illumination.Especially,the light intensity at the focal point is about 100 times higher than that of the incident light.Such a focusing optical field reflected from the curved grating structure can provide a deep potential to trap cold atoms.We discuss the feasibility of the structure serving as an optical dipole trap.Our results are as follows.(i) Van der Waals attraction potential to the surface of the structure has a low effect on trapped atoms,(ⅱ) The maximum trapping potential is ~1.14 mK in the optical trap,which is high enough to trap cold ~(87)Rb atoms from a standard magneto-optical trap with a temperature of 120 μK,and the maximum photon scattering rate is lower than 1/s.(ⅲ) Such a microtrap array can also manipulate and control cold molecules,or microscopic particles. 相似文献
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M. Lontano D. Ryutov 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2002,18(3):347-351
We demonstrate the in situ detection of cold 87Rb atoms near a dielectric surface using the absorption of a weak, resonant evanescent wave. We have used this technique in
time of flight experiments determining the density of atoms falling on the surface. A quantitative understanding of the measured
curve was obtained using a detailed calculation of the evanescent intensity distribution. We have also used it to detect atoms
trapped near the surface in a standing-wave optical dipole potential. This trap was loaded by inelastic bouncing on a strong,
repulsive evanescent potential. We estimate that we trap 1.5×104 atoms at a density 100 times higher than the falling atoms.
Received 14 May 2002 Published online 8 October 2002
RID="a"
ID="a"e-mail: spreeuw@science.uva.nl 相似文献
15.
R. W. Mu Z. L. Wang Y. L. Li X. M. Ji J. P. Yin 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2010,59(2):291-300
We experimentally demonstrate a practical scheme to form a controllable
double-well optical dipole trap for cold atoms (or cold molecules), and give
some experimental results as well as the fabrication method of a binary
π-phase plate. The dependence of the double-well characteristics on the phase
etching error of the π-phase plate and the evolution of the double-well
optical trap from two wells to a single one are studied both theoretically
and experimentally, and the experimental results are consistent with the
theoretical prediction. Furthermore, the dynamic process of loading and
splitting of cold 87Rb atoms from a standard magneto-optical trap (MOT)
into our controllable double-well one are studied by Monte Carlo
simulations. Our study shows that the loading efficiency of cold atoms from
the standard MOT into our single-well trap can reach 100%, and the
relative atomic density will be reduced from 1.0 to ∼0.5 during the
evolution of our double-well trap, in which the temperature of cold atoms is
reduced from 20 μK to ∼15 μK. In final, some potential
applications of our controllable double-well optical trap in atom and
molecule optics are briefly discussed. 相似文献
16.
We propose a novel scheme to form a 2D dark optical surface lattice (DOSL) for cold atoms on the surface of the dense flint glass by using two sets of blue-detuned evanescent wave interference fields and a blue-detuned evanescent wave field. In the 2D DOSL, cold atoms will be trapped in the vicinity of minimum intensity and suffered the minimal light shift as well as the lowest coherence loss. The total potential and trap-depth of the individual optical micro-trap in the 2D DOSL are high enough to trap cold atoms (T = 120 μK) released from the standard magneto-optical trap (MOT), and atoms trapped in the 2D DOSL can be cooled to several μK with the efficient intensity-gradient Sisyphus cooling. The lattice constant of the DOSL can be controllable by changing the incident angles of lights. 相似文献