λ／4相移DFB掺Yb~(3+)单纵模光纤激光器研制与特性分析
文献类型：学位论文
| 作者 | 陈嘉琳 |
| 学位类别 | 硕士 |
| 答辩日期 | 2003 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 陈柏 |
| 关键词 | 惯性约束核聚变 λ／4相移 掺Yb~(3+)光纤激光器 分布反馈结构 单纵模 紫外修整 λ／4 phase-shift |
| 其他题名 | Study on manufacture and characteristic of λ/4-shifted DFB Yb-doped fiber laser |
| 中文摘要 | 在惯性约束核聚变（inertial confining fusion-ICF）激光驱动器前端系统中需使用1053nm波长单纵模种子激光。λ／4相移分布反馈（distributed-feedback-DFB）掺Yb光纤激光器可作为ICF激光驱动器前端系统中种子激光器的重要选项：1053nm位于掺孔石英玻璃的发射谱中，其激光上能级寿命长，泵浦效率高，泵浦波长可有较大的选择范围，且适合于LD泵浦；光纤激光器具有低闭值输出特性，且具有紧凑、小体积、便携式、可集成化特点和可灵活弯曲的光波导结构；λ／4相移DFB结构的激光器具有良好的单纵模运行特性。本文第一章介绍了光纤激光器的基本结构及特性。由于光纤光栅是光纤激光器件中的重要元件，而DFB光纤激光器则实质上是一根掺杂的光纤光栅。因此，第一章也详细介绍了各种光纤光栅的特性及制作方法、第二章研究分析了光纤光栅分布反馈（DFB）结构光纤激光器的模谱及阈值特性。由这一章可知，λ／4相移DFB结构具有低阈值及单纵模运行特性。第三章利用光纤光栅的光学矩阵结合相移光纤光栅的理论模型对不同相移量的光纤光栅进行了模拟。并利用模拟结果分析了不同相移量相移光纤光栅反射谱的特性及应用。对相移光纤光栅制作过程中观察到的新现象首次进行了理论分析，很好地解释了上述现象。第四章详细介绍了λ／4相移DFB掺Yb~(3+)光纤激光器的制作研究过程，并通过理论分析，首次确立了使用紫外修整法对相移光纤光栅进行精加工的两种途径。采用紫外修整法对已制作出的近似λ／4相移DFB结构进行精加工，制作出子性能优良的λ／4相移DFB单纵模、单偏振激光器。利用我们所制作的λ／4相移DFB掺Yb~(3+)光纤激光器，在第五章我们研究了其运行特性。所制作的激光器阈值为：25mW。当泵浦功率为140mW时，获得了25mW的1053nm单纵模、单偏振激光。偏振消光比约30dB，单纵模激光功率涨落小于2％，边模抑制比约60dB。在这一章还研究了温度、机械扰动及端面菲涅尔反射对该激光器的影响。 |
| 英文摘要 | The front-end system of laser driver in the ICF (inertial confining fusion) experiment needs a Single longitudinal mode seed laser at 1053nm. λ／4 phase-shift distributed-feedback DFB Yb-doped fiber lasers can be an important candidate of a seed laser in the front-end system because of following reasons. At the beginning, 1053nm exists in emission spectrum of Yb~(3+) in Yb-doped silica fiber. What's more, Yb-doped lasers have many advantages such as long upper level lifetime, high pump efficiency, large select wide at pumping wavelength and suitable for being pumped by LD. Next, fiber laser have exhibited a lot of good characteristics, for example, low threshold, small volume, convenient for integration, bendable agilely structure and so on. Finally, single longitudinal mode laser can stably run inλ／4 phase-shift DFB fiber lasers. In the first chapter, the basic configuration and characteristic of fiber laser were introduced. Because fiber grating was an important device in fiber laser, what's more, DFB fiber lasers is no more than a fiber grating written on the doped fiber. For these reason, characteristic and making method of fiber grating are introduced in detail. hi the second chapter, the characteristic of mode configuration and threshold in DFB fiber laser are analyzed. According to the analysis, we can know the reason that Single longitudinal mode laser can stably run in A /4phase-shift DFB fiber lasers. In the third chapter, the characteristic of spectrum of the fiber grating with different phase-shift was analyzed with computer by the use of optics matrix and theory on phase-shift fiber grating. A new phenomenon in a procedure of manufacturing phase-shift fiber grating is firstly found and explained theoretically. In the fourth chapter, the technique of manufacturingλ／4 phase-shift Yb~(3+)-doped fiber lasers is researched deeply. The methods processing preciselyλ／4 phase-shift fiber grating with UV trimming are concluded. Single longitudinal mode, single polarization λ／4 phase-shift DFB Yb~(3+)-doped fiber CW lasers with excellent performance were manufactured with the methods. In the fifth chapter, running characteristics of the single longitudinal mode, single polarizationλ／4 phase-shift DFB Yb~(3+)-doped fiber CW lasers were researched. The fiber laser have the following excellent characteristics: Output power of 25mW, fluctuation of less than 2%, 100% single longitudinal mode, 30dB polarization extinction ratio, 60dB' signal-to-noise. On the other hand, the effect on the fiber lasers is also researched from several factors such as temperature, mechanism perturbation and fresnel reflection of fiber end section. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/16433]  |
| 专题 | 上海光学精密机械研究所_学位论文 |
| 推荐引用方式 GB/T 7714 | 陈嘉琳. λ／4相移DFB掺Yb~(3+)单纵模光纤激光器研制与特性分析[D]. 中国科学院上海光学精密机械研究所. 2003. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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