基于碳纳米管双向锁模掺铒光纤激光器的研究

发布时间：2018-09-08 18:02

【摘要】：锁模光纤激光器在医学、军事、非线性光学以及高速光通信等领域有相关的应用。随着人们对该领域不断深入研究,锁模激光器有新的发展方向。本文主要围绕锁模掺铒光纤激光器进行了相关的实验研究。首先,简单介绍锁模光纤激光器的研究背景、锁模激光器当今发展状况、研究意义和锁模激光器的发展前景。简单介绍了激光器的锁模原理;不同锁模激光器的锁模模式以及光脉冲在谐振腔内可能发生的不同的非线性效应。其次,实验研究基于碳纳米管的单向被动锁模掺铒光纤激光器。在光谱仪中发现,中心波长两边有清晰的Kelly边带,中心波长在1560nm附近变化;在示波器内,发现脉冲宽度变化范围为400ps~900ps,重复频率约为7.57MHz。再次,实验研究基于碳纳米管的双向被动锁模掺铒光纤激光器,可以同时实现基于碳纳米管的被动锁模,得到双向稳定脉冲序列。本文分析了该双向被动锁模掺铒光纤激光器在不同泵浦功率下的输出特性,通过调节偏振控制器以及泵浦功率,得到不同中心波长,脉冲持续时间和重复频率的双向脉冲。改变掺铒光纤长度,锁模脉冲的光谱也会发生变化。并且当泵浦功率较大时,逆时针方向的脉冲序列发生分裂。最后,运用分布傅里叶方法,对基于碳纳米管锁模掺铒光纤激光器进行数值仿真,运用MATLAB模拟光脉冲在光纤传输的过程,改变激光器环形腔的参数,得到不同类型的锁模脉冲,并且简要分析了激光器环形腔的参数对输出脉冲特性的影响。
[Abstract]:Mode-locked fiber lasers are widely used in medicine, military, nonlinear optics and high speed optical communication. With the further research in this field, mode-locked lasers have a new development direction. This paper focuses on the experimental study of mode-locked erbium doped fiber laser. Firstly, the research background of mode-locked fiber laser, the development status of mode-locked fiber laser, the significance of research and the development prospect of mode-locked fiber laser are briefly introduced. The principle of mode-locking, the mode locking of different mode-locked lasers and the different nonlinear effects of optical pulses in the resonator are briefly introduced. Secondly, the unidirectional passive mode-locked erbium-doped fiber laser based on carbon nanotubes is studied experimentally. It is found in the spectrometer that there is a clear Kelly sideband on both sides of the center wavelength, and the center wavelength changes near 1560nm, while in the oscilloscope, the pulse width varies from 400 pss to 900psand the repetition rate is about 7.57mHz. Thirdly, a bidirectional passively mode-locked erbium-doped fiber laser based on carbon nanotubes is experimentally studied, which can simultaneously realize passive mode-locking based on carbon nanotubes and obtain bidirectional stable pulse sequences. In this paper, the output characteristics of the bidirectional passively mode-locked erbium-doped fiber laser at different pump power are analyzed. By adjusting the polarization controller and pump power, the bidirectional pulses with different center wavelengths, pulse duration and repetition rate are obtained. When the length of erbium-doped fiber is changed, the spectrum of mode-locked pulse will change. And when the pump power is high, the pulse sequence in the counterclockwise direction splits. Finally, the distributed Fourier method is used to simulate the erbium doped fiber laser based on carbon nanotube mode-locking. MATLAB is used to simulate the process of optical pulse transmission in the fiber. The parameters of the ring cavity are changed and different types of mode-locked pulses are obtained. The influence of laser ring cavity parameters on the output pulse characteristics is also briefly analyzed.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN248

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