基于电磁感应光透明的艾里光束存储

发布时间：2018-04-18 22:26

本文选题：电磁感应光透明 + 艾里光束　；参考：《吉林大学》2017年硕士论文

【摘要】：用艾里方程来进行描述的艾里光束在近几年得到了广泛的关注。于2007年被Christodoulides和他的学生们首次说明。光束拥有多个卓越的性质,比如“自加速”,“无衍射”,和“自愈性”。自加速性是不断横向加速的艾里光束强度剖面在传播时不变。无衍射和自愈性意味着光束可以保证它的传播形状,并且被小障碍物阻挡以后可以重新恢复。这些特殊的特性使得艾里光束在多个应用领域中非常有用,例如显微操纵术,等离子引导,波束自动对焦和光子弹领域。迄今为止,产生艾里光束的传统方法是使用线性空间光调制器对高斯光加立方相位,然后用傅里叶透镜转化已调整的光束。对于操控光,电磁感应光透明是一个有效的方法。强光在不透明介质制造量子干涉时制造量子干涉,弱光不被吸收的现象。这种方法可以被用来存储探测光。基于电磁感应光透明院里的光存储可以看做黑态极子。存储介质中,原子气体的扩散效应会对释放出的图像进行破坏,因此选择没有原子扩散的固体介质。我们把目光放到稀土材料上,是因为它的窄线宽并且长退相干时间,在对光脉冲进行存储时更具优势。使用电磁感应光透明技术来对艾里光束传播进行操控的技术逐渐兴起。进行了很多与之相关的研究和观察。艾里光束的相干控制对于进一步操控光束和信息处理非常重要,在本文中我们实验上研究通过电磁感应光透明来实现二维艾里光束在固体介质中的存储和释放。在电磁感应光透明条件下,弱探测光和强相干光应用于三能级Λ系统实验介质中。探测光横截面携带二维艾里光束波包,它的时间线性为高斯线型。通过关闭相干场,探测光艾里光束被存储在两基态能级间的原子自旋相干中。经过一段存储时间,重新开启控制场,存储的艾里光束会被重新释放。这种艾里光束的存储是基于光与原子自旋相干的相干转换。重新释放到的艾里光束与存储之前非常相近。而且,也对释放到的艾里光束的自愈性进行了研究。艾里光束的存储发展了艾里光束的控制方法,对未来的应用更加有用。
[Abstract]:The Eli beam described by the Elliot equation has attracted much attention in recent years.It was first explained by Christodoulides and his students in 2007.The beam has many outstanding properties, such as self-acceleration, non-diffraction, and self-healing.Self-acceleration is the constant transverse acceleration of the beam intensity profile at the time of propagation.Non-diffraction and self-healing means that the beam can keep its propagation shape and can be restored after being blocked by small obstacles.These special properties make the Ellie beam very useful in many applications such as micromanipulation plasma guiding beam auto-focusing and light bullet fields.Up to now, the traditional method to produce the Ellie beam is to use the linear spatial modulator to add the cubic phase to the Gao Si light, and then transform the adjusted beam with the Fourier lens.Electromagnetically induced light transparency is an effective method for manipulating light.The phenomenon that strong light makes quantum interference in opaque medium and weak light is not absorbed.This method can be used to store probe light.Optical storage in a transparent hospital based on electromagnetic induction can be considered as a black polaron.In the storage medium, the diffusion effect of atomic gas will destroy the released image, so the solid medium without atomic diffusion is chosen.We focus on rare earth materials because of its narrow linewidth and long decoherence time, which is superior to the storage of optical pulses.The use of electromagnetically induced light transparency to control the propagation of Eli beams is emerging.A lot of related studies and observations have been carried out.The coherent control of the beam is very important for the further manipulation of the beam and information processing. In this paper we experimentally study the storage and release of the two-dimensional Ellie beam in solid media by means of electromagnetic induced light transparency.Under the condition of electromagnetically induced light transparency, weak probe light and strong coherent light are applied in the experimental medium of a three-level system.The detected cross section carries a two-dimensional Ellie beam packet, which has a linear time line with Gao Si.By closing the coherent field, the probe beam is stored in atomic spin coherence between two ground state levels.After a period of storage, the control field is reopened, and the stored Eli beam is released again.The beam is stored on the basis of coherent conversion between the light and the atomic spin.The rereleased Eli beam is very close to the previous memory.Moreover, the self-healing of the released Eli beam is also studied.The storage of Eli beam develops the control method of Eli beam, which is more useful for future applications.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O43

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