超冷玻色气体中电磁感应透明和慢光现象中的原子相互作用效应

我们研究了原子之间的相互作用对超冷玻色原子气体中电磁感应透明性质和光的群速的影响.我们考虑Λ型的原子结构.最初原子凝聚在其中的一个基态上,凝聚体原子用平均场理论来描述,原子之间的相互作用近似为两体的s-波散射长度,原子之间的碰撞不引起原子的电子跃迁.     

The periodic magnetic cylinder tube for atom guidance： transport efficiency analysis

We have proposed a model of periodic axial magnetized hollow tube for atom guidance (1999 Opt. Commun. 160 72－4). In the present paper, an analytic solution of the magnetic field inside the tube is obtained and the transport efficiency of the cold atoms in the magnetic tube at different tube intensities of magnetization is discussed. The effect of the curvature of magnetic tube on the atom transport efficiency is also considered. We have found that the tube has a cooling effect on the transverse temperature of the transported atoms.     

The periodic magnetic cylinder tube for atom guidance： transport efficiency analysis

We have proposed a model of periodic axial magnetized hollow tube for atom guidance (1999 Opt. Commun. 160 72-4). In the present paper, an analytic solution of the magnetic field inside the tube is obtained and the transport efficiency of the cold atoms in the magnetic tube at different tube intensities of magnetization is discussed. The effect of the curvature of magnetic tube on the atom transport efficiency is also considered. We have found that the tube has a cooling effect on the transverse temperature of the transported atoms.     

大功率部分端面抽运混合腔板条激光器

在半导体抽运的全固态激光器中,激光晶体上的热畸变限制了激光器在大功率下输出时保持高光束质量的能力。板条结构的固体激光器具有优异的散热能力,再配合部分端面抽运以及稳一非稳柱面混合腔的使用,使大功率高光束质量的激光输出成为可能。在德国EdgeWave GmbH进行的对这一技术的合作研究中,利用不到100mm的腔长,在Nd：YVO4板条激光器上获得了110W近衍射极限的1．06μm连续激光输出,这时在非稳腔方向上的光束传播因子M^2为1．3。在稳腔方向上为1．5。通过对输出激光进行空间滤波切除腔镜造成的衍射旁瓣后,50W输出时M^2的典型值在非稳腔和稳腔方向上分别为1．09和1．2。     

The periodic magnetized cylinder tube for atom guidance： quantized motion analysis

We have analysed the transport effciency of an atomic waveguide constructed from a periodic axially magnetized hollow tube.We took into consideration the quantized motion of the atom inside the magnetic hollow cylinder tube,which is significant for the transportation of cold atoms.We deduced the quantized motion modes of the atomic waves in the tube by the approximation of infinite potential,which is valid for cold atoms and strong magnetization.For the atomic waveguide with weak magnetization,we have calculated the tunnelling effect of the atomic wave.The adiabatic condition for the motion of cold atoms is discussed.A time orbit potential method for solving the “zero magnetic field problem” is proposed.     

中性原子磁导引

我们发展了一种新的磁原子导引方法,讨论了使用空心磁管导引中性冷原子的可能性。