本文選題：電磁感應(yīng)光透明 + 艾里光束��； 參考：《吉林大學(xué)》2017年碩士論文

【摘要】：用艾里方程來(lái)進(jìn)行描述的艾里光束在近幾年得到了廣泛的關(guān)注。于2007年被Christodoulides和他的學(xué)生們首次說(shuō)明。光束擁有多個(gè)卓越的性質(zhì),比如“自加速”,“無(wú)衍射”,和“自愈性”。自加速性是不斷橫向加速的艾里光束強(qiáng)度剖面在傳播時(shí)不變。無(wú)衍射和自愈性意味著光束可以保證它的傳播形狀,并且被小障礙物阻擋以后可以重新恢復(fù)。這些特殊的特性使得艾里光束在多個(gè)應(yīng)用領(lǐng)域中非常有用,例如顯微操縱術(shù),等離子引導(dǎo),波束自動(dòng)對(duì)焦和光子彈領(lǐng)域。迄今為止,產(chǎn)生艾里光束的傳統(tǒng)方法是使用線性空間光調(diào)制器對(duì)高斯光加立方相位,然后用傅里葉透鏡轉(zhuǎn)化已調(diào)整的光束。對(duì)于操控光,電磁感應(yīng)光透明是一個(gè)有效的方法。強(qiáng)光在不透明介質(zhì)制造量子干涉時(shí)制造量子干涉,弱光不被吸收的現(xiàn)象。這種方法可以被用來(lái)存儲(chǔ)探測(cè)光�；陔姶鸥袘�(yīng)光透明院里的光存儲(chǔ)可以看做黑態(tài)極子。存儲(chǔ)介質(zhì)中,原子氣體的擴(kuò)散效應(yīng)會(huì)對(duì)釋放出的圖像進(jìn)行破壞,因此選擇沒(méi)有原子擴(kuò)散的固體介質(zhì)。我們把目光放到稀土材料上,是因?yàn)樗恼�寬并且長(zhǎng)退相干時(shí)間,在對(duì)光脈沖進(jìn)行存儲(chǔ)時(shí)更具優(yōu)勢(shì)。使用電磁感應(yīng)光透明技術(shù)來(lái)對(duì)艾里光束傳播進(jìn)行操控的技術(shù)逐漸興起。進(jìn)行了很多與之相關(guān)的研究和觀察。艾里光束的相干控制對(duì)于進(jìn)一步操控光束和信息處理非常重要,在本文中我們實(shí)驗(yàn)上研究通過(guò)電磁感應(yīng)光透明來(lái)實(shí)現(xiàn)二維艾里光束在固體介質(zhì)中的存儲(chǔ)和釋放。在電磁感應(yīng)光透明條件下,弱探測(cè)光和強(qiáng)相干光應(yīng)用于三能級(jí)Λ系統(tǒng)實(shí)驗(yàn)介質(zhì)中。探測(cè)光橫截面攜帶二維艾里光束波包,它的時(shí)間線性為高斯線型。通過(guò)關(guān)閉相干場(chǎng),探測(cè)光艾里光束被存儲(chǔ)在兩基態(tài)能級(jí)間的原子自旋相干中。經(jīng)過(guò)一段存儲(chǔ)時(shí)間,重新開(kāi)啟控制場(chǎng),存儲(chǔ)的艾里光束會(huì)被重新釋放。這種艾里光束的存儲(chǔ)是基于光與原子自旋相干的相干轉(zhuǎn)換。重新釋放到的艾里光束與存儲(chǔ)之前非常相近。而且,也對(duì)釋放到的艾里光束的自愈性進(jìn)行了研究。艾里光束的存儲(chǔ)發(fā)展了艾里光束的控制方法,對(duì)未來(lái)的應(yīng)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.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：O43

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