可调谐多波长窄线宽光纤激光器机理及特性研究

发布时间：2018-03-11 07:19

本文选题：布里渊散射　切入点：瑞利散射　出处：《哈尔滨工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：可调谐多波长窄线宽光纤激光器,由于具有可调谐波长、窄线宽等优点在光通信、传感、精密测量等领域有着广泛应用前景。目前如何同时实现多波长、窄线宽及可调谐性能指标是本领域研究热点问题之一。本文充分对光纤的受激瑞利散射和受激布里渊散射效应研究并提出可能的技术解决方案。本论文主要工作如下:理论分析了光纤受激瑞利散射和受激布里渊散射效应,在提高布里渊阈值技术手段方面,通过调研分析已有提高受激布里渊散射阈值方法,包括应力,改变光纤结构等。本论文采用拉锥方法改变光纤芯径来提高受激布里渊散射阈值,从而实现高受激布里渊阈值光纤用于抑制受激布里渊散射;实验对比测试了相同长度单模光纤和拉锥光纤的受激布里渊散射阈值。在光纤激光器线宽测量技术方面,通过比较常用的三种测量方法进行比较,重点对差拍法进行理论研究和实验验证。论文提出一种基于饱和吸收体、复合腔、瑞利散射辅助相结合的多波长窄线宽光纤激光器方案,在本方案里利用高受激布里渊阈值光纤作为收集瑞利散射的媒介,实现对激光器线宽压窄效果;实验实现了单波长、双波长可切换的窄线宽激光输出,实验证实饱和吸收体和多腔体结构的选模及滤波功能,激光可运行在单纵模状态,饱和吸收体同时有助于改善激光器输出稳定性;通过对比有无瑞利散射效应的实验对比发现,基于高受激布里渊阈值光纤的收集受激瑞利散射可获得3倍左右的线宽压窄效应。最后论文研究一种基于受激布里渊效应的多波长窄线宽光纤激光器方案,实验获得12条受激布里渊激射,同时结合多腔体的选模机理实现实现单纵模的运行;实验对比相同长度高受激布里渊阈值光纤和普通单模光纤产生的不同布里渊激射波长数目,同时分析了种子光源和放大器泵浦光源的功率对布里渊光纤激光器的影响以及波长的可调谐性输出特性。
[Abstract]:Tunable multi wavelength narrow linewidth fiber laser with tunable wavelength, narrow linewidth, etc. in optical communication, sensing, precision measurement and other fields have a wide application prospect. At present, how to achieve multi wavelength and narrow linewidth tunable performance index is one of the hot research field. This paper studies on fully and effect of stimulated Brillouin scattering of Rayleigh scattering by the optical fiber and the possible technical solutions. The main work of this thesis is as follows: the theoretical analysis of the fiber stimulated Rayleigh scattering and stimulated Brillouin scattering, Brillouin threshold value in improving the technology, through the investigation and analysis of the existing improve SBS threshold method, including the stress. Change the fiber structure. This paper adopts taper method to change the fiber core diameter to improve the SBS threshold, in order to achieve high stimulated Brillouin threshold for suppression of optical fiber Preparation of stimulated Brillouin scattering; experiment to test the same length single-mode fiber and tapered fiber stimulated Brillouin scattering threshold. In fiber laser linewidth measurement technology, through the comparison of three measurement methods commonly used, focusing on the beat method of theoretical study and experimental verification. This paper proposes a composite cavity based on saturation absorber, multi wavelength narrow linewidth fiber laser scheme for Rayleigh scattering auxiliary combination, in this scheme using high stimulated Brillouin fiber Rayleigh scattering threshold as a collection of medium pressure to achieve the effect of narrow laser linewidth; experimental realization of single wavelength and dual wavelength narrow linewidth laser output can be switched, mode selection and experiment the filtering function of the saturable absorber and multi cavity structure, the laser can operate in single longitudinal mode, saturable absorber also helps to improve the stability of laser output; There is no comparison than the Rayleigh scattering effect, high stimulated Brillouin threshold fiber collection by Ji Ruili scattering can be obtained about 3 times the linewidth narrowing effect. Finally, based on research on the subject of multi wavelength narrow linewidth fiber laser scheme stimulated Brillouin effect experiment, obtained 12 stimulated Brillouin lasing at the same time. Combined with the mode selection mechanism to achieve the multi cavity single longitudinal mode operation; experimental comparison of different Brillouin lasing wavelength number length high stimulated Brillouin threshold fiber and single-mode fiber production, and analyzes the tunable output characteristics of power amplifier and seed light source pumping source of Brillouin fiber laser and wavelength.

【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN248

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