高重复频率锁模光纤激光器的研究
文献类型：学位论文
| 作者 | 叶泞泞 |
| 学位类别 | 硕士 |
| 答辩日期 | 2012 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 瞿荣辉 |
| 关键词 | 高重复频率 锁模 磷酸盐玻璃光纤 |
| 其他题名 | Study of High Repetition Rate Mode-locked Fiber Laser |
| 中文摘要 | 高重复频率的脉冲激光器在高速光学采样技术、下一代超高速大容量光通信、频率计量学、精准时基的产生和恢复等许多科学技术领域具有广泛的应用前景。短腔被动锁模光纤激光器由于其结构简单，无需外部调制或者脉冲注入，是产生高质量高重复频率超快脉冲的优选方案之一。在这样的背景下，本论文基于Er/Yb共掺磷酸盐玻璃光纤，引入石墨烯作为饱和吸收元件，构造短直线腔被动锁模光纤激光器，从理论和实验两方面对相关技术做了较深入的研究，主要内容包括： ⑴分析了Er3+和Yb3+在磷酸盐玻璃基质中的能量传递，Er3+的能级跃迁及Er/Yb共掺的磷酸盐玻璃光纤的特点；分析了石墨烯的零能带和二维平面结构带来的出众的饱和吸收特性，以此为基础对短腔锁模光纤激光器进行了方案设计。 ⑵实验摸索了利用光诱导方法在光纤端面沉积石墨烯饱和吸收体的工艺，测试了所获得石墨烯饱和吸收体样品的透射谱和饱和吸收曲线，并将其应用于短腔光纤激光中成功地实现了锁模。 ⑶实现了基于超短Er/Yb共掺磷酸盐玻璃光纤和石墨烯饱和吸收体的的高重复频率锁模光纤激光器实验样机，其激光泵浦阈值为35mW；当泵浦为80mW时，输出激光为1.2mW，中心波长为1533.768nm，锁模脉冲的重复频率为7.02GHz。 ⑷从基于饱和吸收体的锁模速率方程出发，推导了稳定锁模的关系表达式，并类比半导体饱和吸收体的理论，推导出了关于石墨烯饱和吸收体的连续锁模的条件表达式，同时对实验中的高重复频率锁模光纤激光器实现连续锁模的条件进行了分析。 ⑸搭建了基于非线性偏振旋转锁模的环形光纤激光器和暗脉冲环形光纤激光器，分别实现了亮脉冲和暗脉冲的输出，分析并指出了两者的作用机理都是基于腔内的正交偏振态作用，不同的是非线性偏振旋转技术因检偏器的偏振相关性引入了强度相关振幅调制(SAM)并产生单偏振脉冲输出，而暗脉冲表现为相互耦合的双偏振运转。 |
| 英文摘要 | There is a considerable demand for pulses with high repetition rate in many scientific and technologic fields, such as high-speed optical sampling technique, next generation of high-speed optical communication system, frequency metrology, precision time base generation and recovery, et. al.. Short cavity based passively mode-locked fiber laser is one of the optimal options, due to its simple configuration, no need of extra modulation and pulse injection, generating high quality and high repetition rate ultrafast pulses. This paper discusses a mode-locked fiber laser, which is configured in short linear cavity using Er/Yb co-doped phosphate glass fiber and graphene saturable absorber, refer to theory and experiment. The outline of this paper is as follows: (1)The characteristics of Er/Yb co-doped phosphate glass fiber is analyzed, as well as the energy transference between Er3+ and Yb3+ and the energy level transition of Er3+; the outstanding saturable absorption characteristics of graphene due to its 2D structure and zero band energy gap is also analyzed. A mode-locked fiber laser configured in short cavity based on the above analysis is designed. (2)A process of depositing graphene on the fiber end face using optical induced method is explored; the characteristics of the gotten graphene saturable absorber sample is tested as well, including the transmittance and saturable absorption; then it is successfully used to achieve mode locking in short cavity fiber laser. (3)A short cavity mode-locked fiber laser using Er/Yb co-doped phosphate glass fiber and graphene saturable absorber is built up, the threshold of which is 35mW. When the pump is 80mW, its output is 1.2mW, with its central wavelength 1533.768nm and its repetition rate up to 7.02GHz. (4)CW mode locking criterions about the graphene saturable absorber is derived from the mode locking rate equations and analogized to the semiconductor saturable absorber theory. And the CW mode locking requirement of this high repetition rate mode-locked fiber laser is also analyzed. (5)A nonlinear polarization rotation based mode-locked fiber ring laser and a dark pulse fiber ring laser are constructed, respectively, and the bright and dark pulses are achieved, respectively, too. The reason of pulsing that both are results from the interaction of two orthogonal polarization states in cavity, is analyzed. By comparison, the SAM is introduced by the polarization analyzer, and the polarized bright pulses are outputted in nonlinear polarization rotation technique, while the dark pulses are results of the coupling of dual-polarization. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/16738]  |
| 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 | 叶泞泞. 高重复频率锁模光纤激光器的研究[D]. 中国科学院上海光学精密机械研究所. 2012. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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