聚合物光纤随机激光的控制

发布时间：2018-03-24 03:25

本文选题：随机激光　切入点：纳米颗粒　出处：《合肥工业大学》2017年硕士论文

【摘要】：随机激光不同于传统的激光,在无序光增益介质中光多重散射实现光反馈。自从Letokhov在理论上提出随机激光以来,随机激光就被广泛的研究并且应用。为了提高随机激光的效率和控制随机激光的方向,人们利用光纤的一维束缚作用得到高效率、低阈值以及有方向性的随机激光,出现随机光纤激光。随机激光没有确定的光学谐振腔,这也就导致了随机发射光谱具有不可控性。所以,控制随机激光也成为一个难题。为了解决控制随机激光这一难题,本论文主要研究聚合物光纤随机激光的控制。主要是控制随机激光的波长和偏振。研究内容如下:(1)控制聚合物光纤掺杂无序度,控制随机激光发射波长。聚合物光纤无序度可以由纤芯掺杂物控制,纤芯掺杂物的种类以及浓度都会影响无序度,无序度决定了散射平均自由程ls,从而影响随机激光发射波长。(2)在线温控聚合物光纤随机激光发射波长。聚合物光纤具有大的负热光系数,可以在线温控聚合物光纤纤芯折射率,从而实现在线温控随机激光发射波。(3)取向的无序聚合物光纤随机激光偏振控制。在制备聚合物光纤时,控制拉制时温度,通过拉制过程制备具有取向的聚合物光纤,获得具有偏振性的随机聚合物光纤激光,可以通过控制散射平均自由程和光纤长度控制随机激光偏振性质。(4)磁光调制聚合物光纤随机激光偏振特性。通过在纤芯掺杂具有磁光效应的纳米颗粒,利用法拉第旋转原理,实现对随机激光偏振角度的控制。多种方法实现对随机激光发射特性的控制,推动随机激光控制的发展。
[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.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN24

【参考文献】