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题名	基于相移光纤光栅和半导体光放大器的窄线宽环形腔激光器稳定性研究
作者	施展
文献子类	硕士
导师	陈迪俊
关键词	相移光纤光栅，环形腔，窄线宽，光热效应，稳定性 Phase-shifted fiber grating, ring cavity, narrow linewidth, photothermal effect，stability
其他题名	Research on the Stability of Narrow Linewidth Ring Lasers Based on Phase Shift Fiber Grating and Semiconductor Optical Amplifier
英文摘要	高稳定性的窄线宽激光光源在相干通信、空间冷原子钟、高精度长距离干涉测量和精密光谱测量等前沿基础科学和高技术领域有着重要和广泛的应用。为了实现窄线宽激光输出，本文提出了一种基于相移光纤光栅的窄线宽激光器技术，使用相移光纤光栅作为窄带滤波器，利用半导体光放大器作为增益介质，实现了一种窄线宽的环形腔光纤激光器，得到了波长为1548.65nm、线宽为1.8KHz的单频窄线宽激光输出。同时在测量输出激光的特性过程中，发现了一种奇特的不稳定现象，在电流增加时输出功率和波长漂移会产生不稳定现象，同时激光器也会处于多纵模运转的状态，文章对此不稳定行为进行了定性解释，并且通过对比实验证明这种不稳定性是由光热效应导致的。主要内容如下： 1、基于相移光纤光栅，搭建了一套光纤环形腔激光器系统，利用了半导体光放大器作为增益介质，将相移光纤光栅插入环形腔作为腔内滤波器选出单纵模，实现了激光的单频输出，输出洛伦兹线宽为1.8KHz，波长1548.65nm，功率可到6mW以上。 2、对激光器的稳定性进行了研究，在测量激光器输出特性时，发现了一种奇特的不稳定现象。输出光功率随着电流或者温度的增加或者减少在多个状态之间来回跳变，同时激光器也会处于多纵模运转状态。本文对该现象进行了分析，后续通过对比实验，证明了这种现象是由于相移光纤光栅的光热效应所产生的，减弱光热效应会对稳定性有所增强。同时提出了减弱光热效应的一些方法，可有效增加激光器的单频工作区域。; High-stability narrow-linewidth laser sources have important and extensive applications in the frontier basic sciences and high-tech fields such as coherent communication, space cold atomic clocks, high-precision long-distance interferometry, and precision spectroscopy. In order to achieve a narrow linewidth laser output, a narrow-linewidth laser technology based on phase-shifted fiber gratings is proposed in this paper. Phase-shifted fiber gratings are used as narrow-band filters and semiconductor optical amplifiers are used as gain media to achieve a narrow linewidth. A narrow-width ring-cavity fiber laser is realized, and a single-frequency narrow linewidth laser output with a wavelength of 1548.65 nm and a line width of 1.8 KHz is obtained. At the same time, in the process of measuring the characteristics of the output laser, a peculiar instability phenomenon was found. At high currents, the output power will produce instability, and the laser will also be in a state of multi-longitudinal mode. The article gave a qualitative explanation of this unstable behavior and demonstrated that this instability was caused by photothermal effects through comparative experiments. The main contents are as follows: 1. Based on the phase-shifted fiber grating, an optical fiber ring cavity laser system was set up. The semiconductor optical amplifier was used as the gain medium. The phase-shifted fiber grating was inserted into the ring cavity to select the single longitudinal mode as the cavity filter, the single frequency output of the laser is realized, the output Lorentzian line width is 1.8 KHz, the wavelength is 1538.65 nm, and the power can be more than 6 mW. 2. The stability of the laser was studied and it was found that when measuring the output characteristics of the laser, a peculiar instability phenomenon was found. The output optical power jumps back and forth between multiple states as the current or temperature increases or decreases, and the laser is also in multi-longitudinal mode operation. This article analyzes this phenomenon, and subsequent comparison experiments show that this phenomenon is due to the photo-thermal effect of the phase-shifted fiber grating, and that weakening the photo-thermal effect will increase the stability. At the same time, some methods for reducing the photothermal effect are proposed, which can effectively increase the single-frequency working area of the laser.
学科主题	光学工程
内容类型	学位论文
源URL	[http://ir.siom.ac.cn/handle/181231/31087]
专题	中国科学院上海光学精密机械研究所
作者单位	中国科学院上海光学精密机械研究所
推荐引用方式 GB/T 7714	施展. 基于相移光纤光栅和半导体光放大器的窄线宽环形腔激光器稳定性研究[D].

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