本文選題：隨機(jī)激光　切入點(diǎn)：納米顆粒　出處：《合肥工業(yè)大學(xué)》2017年碩士論文

【摘要】：隨機(jī)激光不同于傳統(tǒng)的激光,在無(wú)序光增益介質(zhì)中光多重散射實(shí)現(xiàn)光反饋。自從Letokhov在理論上提出隨機(jī)激光以來(lái),隨機(jī)激光就被廣泛的研究并且應(yīng)用。為了提高隨機(jī)激光的效率和控制隨機(jī)激光的方向,人們利用光纖的一維束縛作用得到高效率、低閾值以及有方向性的隨機(jī)激光,出現(xiàn)隨機(jī)光纖激光。隨機(jī)激光沒(méi)有確定的光學(xué)諧振腔,這也就導(dǎo)致了隨機(jī)發(fā)射光譜具有不可控性。所以,控制隨機(jī)激光也成為一個(gè)難題。為了解決控制隨機(jī)激光這一難題,本論文主要研究聚合物光纖隨機(jī)激光的控制。主要是控制隨機(jī)激光的波長(zhǎng)和偏振。研究?jī)?nèi)容如下:(1)控制聚合物光纖摻雜無(wú)序度,控制隨機(jī)激光發(fā)射波長(zhǎng)。聚合物光纖無(wú)序度可以由纖芯摻雜物控制,纖芯摻雜物的種類(lèi)以及濃度都會(huì)影響無(wú)序度,無(wú)序度決定了散射平均自由程ls,從而影響隨機(jī)激光發(fā)射波長(zhǎng)。(2)在線溫控聚合物光纖隨機(jī)激光發(fā)射波長(zhǎng)。聚合物光纖具有大的負(fù)熱光系數(shù),可以在線溫控聚合物光纖纖芯折射率,從而實(shí)現(xiàn)在線溫控隨機(jī)激光發(fā)射波。(3)取向的無(wú)序聚合物光纖隨機(jī)激光偏振控制。在制備聚合物光纖時(shí),控制拉制時(shí)溫度,通過(guò)拉制過(guò)程制備具有取向的聚合物光纖,獲得具有偏振性的隨機(jī)聚合物光纖激光,可以通過(guò)控制散射平均自由程和光纖長(zhǎng)度控制隨機(jī)激光偏振性質(zhì)。(4)磁光調(diào)制聚合物光纖隨機(jī)激光偏振特性。通過(guò)在纖芯摻雜具有磁光效應(yīng)的納米顆粒,利用法拉第旋轉(zhuǎn)原理,實(shí)現(xiàn)對(duì)隨機(jī)激光偏振角度的控制。多種方法實(shí)現(xiàn)對(duì)隨機(jī)激光發(fā)射特性的控制,推動(dòng)隨機(jī)激光控制的發(fā)展。
[Abstract]:The random laser is different from the traditional laser in realizing light feedback in the disordered optical gain medium. Since Letokhov proposed the random laser in theory, In order to improve the efficiency of random laser and control the direction of random laser, we can get high efficiency, low threshold and directional random laser by one-dimensional binding action of optical fiber. Random fiber laser. Random laser has no definite optical resonator, which leads to the random emission spectrum is not controllable. So, controlling random laser becomes a difficult problem, in order to solve the problem of controlling random laser, In this paper, the control of random laser in polymer fiber is studied. The wavelength and polarization of random laser are controlled. Random laser emission wavelength is controlled. The disorder degree of polymer fiber can be controlled by the core dopant. The type and concentration of the core dopant will affect the disorder degree. The disorder degree determines the scattering average free path Lsand thus affects the random laser emission wavelength of the random laser emission wavelength. The temperature controlled polymer fiber has a large negative thermal optical coefficient and can be used to control the refractive index of the polymer fiber core. Thus, the random laser polarization control of disordered polymer fiber with on-line temperature-controlled random laser emission wave of 3) orientation is realized. In the preparation of polymer fiber, the temperature of drawing is controlled, and the oriented polymer fiber is prepared by drawing process. A random polymer fiber laser with polarization is obtained. The polarization property of random laser can be controlled by controlling the average free path of scattering and the length of optical fiber) the polarization property of random laser of polymer fiber can be modulated by magneto-optic modulation. By doping nanocrystals with magneto-optic effect in the core, the Faraday rotation principle is used. The polarization angle of random laser is controlled, and the characteristic of random laser emission is controlled by many methods, which promotes the development of random laser control.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TN24

【參考文獻(xiàn)】

相關(guān)博士學(xué)位論文 前1條

1 胡志家;隨機(jī)光纖激光波導(dǎo)效應(yīng)的研究[D];中國(guó)科學(xué)技術(shù)大學(xué);2014年

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本文編號(hào)：1656513