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Dynamics of a dispersion-tuned swept-fiber laser
Photonics Research ( IF 7.6 ) Pub Date : 2023-05-19 , DOI: 10.1364/prj.484911
Duidui Li, Guolu Yin, Ligang Huang, Lei Gao, Laiyang Dang, Zeheng Zhang, Jingsheng Huang, Huafeng Lu, and Tao Zhu

In this paper, we studied the dynamics of a dispersion-tuned swept-fiber laser both experimentally and theoretically. By adding a dispersion compensation fiber and an electro-optic modulator in the laser cavity, an actively mode-locked laser was obtained by using intensity modulation, and wavelength sweeping was realized by changing the modulation frequency. Using a high-speed real-time oscilloscope, the dynamic behaviors of the swept laser were investigated during wavelength switching, static-sweeping cycle, and continuous sweeping, respectively. It was found that the laser generates relaxation oscillation at the start of the sweeping mode. The relaxation oscillation process lasted for about 0.7 ms, and then the laser started to operate stably. Due to the nonlinear effect, new wavelengths were generated in the relaxation oscillation process, which is not beneficial for applications. Fortunately, relaxation oscillation disappears if the laser starts up and operates in the continuous sweeping mode, and the good sweeping symmetry between the positive sweep and negative sweep increases the application potential of the laser. In addition, the instantaneous linewidth is almost the same as that in the static state. These results describe the characteristics of the laser from a new perspective and reveal, to the best our knowledge, the intensity dynamics of such lasers for the first time. This paper provides some new research basis for understanding the establishment process of dispersion-tuned swept-fiber lasers and their potential application in the future.

中文翻译:

色散调谐扫频光纤激光器的动力学

在本文中,我们从实验和理论上研究了色散调谐扫频光纤激光器的动力学。通过在激光腔内加入色散补偿光纤和电光调制器,利用强度调制获得主动锁模激光器,通过改变调制频率实现波长扫描。使用高速实时示波器,分别研究了扫频激光在波长切换、静态扫描周期和连续扫描期间的动态行为。发现激光在扫描模式开始时产生弛豫振荡。弛豫振荡过程持续约 0.7 ms,随后激光器开始稳定运行。由于非线性效应,在弛豫振荡过程中产生了新的波长,这对应用程序不利。幸运的是,如果激光器启动并工作在连续扫描模式,弛豫振荡就会消失,并且正扫描和负扫描之间良好的扫描对称性增加了激光器的应用潜力。此外,瞬时线宽与静态时几乎相同。这些结果从一个新的角度描述了激光的特性,并据我们所知首次揭示了这种激光的强度动力学。本文为了解色散调谐扫频光纤激光器的建立过程及其未来潜在应用提供了一些新的研究基础。激光器启动并工作在连续扫描模式时,弛豫振荡消失,正扫描和负扫描之间良好的扫描对称性增加了激光器的应用潜力。此外,瞬时线宽与静态时几乎相同。这些结果从一个新的角度描述了激光的特性,并据我们所知首次揭示了这种激光的强度动力学。本文为了解色散调谐扫频光纤激光器的建立过程及其未来潜在应用提供了一些新的研究基础。激光器启动并工作在连续扫描模式时,弛豫振荡消失,正扫描和负扫描之间良好的扫描对称性增加了激光器的应用潜力。此外,瞬时线宽与静态时几乎相同。这些结果从一个新的角度描述了激光的特性,并据我们所知首次揭示了这种激光的强度动力学。本文为了解色散调谐扫频光纤激光器的建立过程及其未来潜在应用提供了一些新的研究基础。瞬时线宽与静态时几乎相同。这些结果从一个新的角度描述了激光的特性,并据我们所知首次揭示了这种激光的强度动力学。本文为了解色散调谐扫频光纤激光器的建立过程及其未来潜在应用提供了一些新的研究基础。瞬时线宽与静态时几乎相同。这些结果从一个新的角度描述了激光的特性,并据我们所知首次揭示了这种激光的强度动力学。本文为了解色散调谐扫频光纤激光器的建立过程及其未来潜在应用提供了一些新的研究基础。
更新日期:2023-05-19
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