近红外飞秒激光相位掩模法制作光纤布拉格光栅
发布时间：2018-07-14 19:45
【摘要】： 全光纤化掺铥光纤激光器在工业、医疗、科技及军事领域具有重要应用前景。光纤布拉格光栅(FBG)是构成全光纤化光纤激光器的关键器件。基于FBG的光纤激光器具有窄线宽输出、结构简单、性能稳定、易于维护等优点。近年来,利用近红外飞秒激光和相位掩模在非光敏光纤上刻写FBG,引起学术界和工程界的广泛关注。与利用紫外脉冲激光在光敏光纤上刻写FBG的传统技术相比,该方法具有更大的应用价值。本文从理论和实验两个方面对近红外飞秒激光相位掩模刻写FBG技术进行了研究。 在理论方面,本文以光纤光栅的基本方程耦合模理论为基础,分析了正弦折射率调制型单模均匀FBG的光谱特性,得到了FBG结构参数对其性能的影响规律;模拟了这种折射率调制形式的二阶FBG的反射谱,为实验上刻写高阶FBG提供了理论依据。为弥补耦合模理论的不足,引入了Rouard这种可以用来分析非均匀FBG特性的数值方法,获得了高斯趾切折射率调制型FBG的反射光谱。 对于飞秒激光相位掩模法刻写系统的设计,主要是以光栅方程和布拉格方程为基础,分析了相位掩模参数对刻写用干涉条纹的影响,得到了合理设计相位掩模的原则,并计算出了光纤与相位掩模的最佳距离范围。搭建了近红外飞秒激光相位掩模刻写FBG的实验系统,成功的在掺铥光纤和光敏光纤上刻写FBG,测量了刻写FBG的反射率和中心波长,FBG的反射率达到95%以上。 针对相位掩模法存在的局限性,对利用透镜改变相位掩模周期的方法进行了理论分析,获得了FBG波长随调谐参数变化的趋势,证明了这种技术可在一定范围内实现FBG波长的连续可调。在实验上,通过调整相位掩模与光纤,以及相位掩模与调谐透镜的距离,实现了基于同一块相位掩模板在较大的波长范围内制作出了不同中心波长的FBG,并实现了激光输出。 利用刻写得到FBG采用两种不同的方式实现了全光纤化光纤激光器,证明了采用泵浦光耦合器方式是以后实现上百瓦高功率全光纤化光纤激光器最可行的方式。最后,采用全光纤化光纤激光器泵浦Ho:YAP实现2.1μm脉冲输出。
[Abstract]:All-fiber thulium doped fiber lasers have important applications in industrial, medical, scientific and military fields. Fiber Bragg grating (FBG) is the key device of all-fiber laser. Fiber laser based on FBG has the advantages of narrow linewidth output, simple structure, stable performance and easy maintenance. In recent years, the use of near-infrared femtosecond laser and phase mask to write FBGs on non-FBGs has attracted wide attention in academia and engineering. Compared with the traditional technique of using ultraviolet pulse laser to write Guang Min fiber, this method has more application value. In this paper, the FBG technique of near infrared femtosecond laser phase mask is studied theoretically and experimentally. In theory, based on the fundamental equation coupled mode theory of fiber grating, the spectral characteristics of sinusoidal refractive index modulated single mode uniform FBG are analyzed, and the influence of FBG structure parameters on its performance is obtained. The reflection spectra of the second order FBG with this refractive index modulation form are simulated, which provides a theoretical basis for the experimental writing of high order FBG. In order to make up for the shortage of coupling mode theory, a numerical method called Rouard, which can be used to analyze the properties of nonuniform FBGs, is introduced, and the reflectance spectra of Gao Si digitally index modulated FBGs are obtained. For the design of femtosecond laser phase mask writing system, based on grating equation and Bragg equation, the influence of phase mask parameters on the interference fringes for writing is analyzed, and the principle of reasonable phase mask design is obtained. The optimum distance range between optical fiber and phase mask is calculated. An experimental system of near-infrared femtosecond laser phase mask is set up to write FBGs on thulium doped fiber and Guang Min fiber successfully. The reflectivity of FBG and the reflectivity of central wavelength are measured to be more than 95%. In view of the limitation of phase mask method, the method of changing phase mask period by lens is analyzed theoretically, and the trend of FBG wavelength changing with tuning parameters is obtained. It is proved that the FBG wavelength can be continuously adjustable in a certain range. By adjusting the distance between phase mask and optical fiber, and the distance between phase mask and tuning lens, FBGs with different center wavelengths are fabricated based on the same block phase mask in a large wavelength range, and the laser output is realized. The all-fiber-optic fiber laser is realized by writing FBG in two different ways. It is proved that using pump optical coupler is the most feasible way to realize hundreds of watts of high-power all-fiber-optic fiber laser in the future. Finally, the output of 2.1 渭 m pulse is realized by using an all-fiber laser pumped by Ho: Yap.
【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】：2010
【分类号】：TN248.1
本文编号：2122749
[Abstract]:All-fiber thulium doped fiber lasers have important applications in industrial, medical, scientific and military fields. Fiber Bragg grating (FBG) is the key device of all-fiber laser. Fiber laser based on FBG has the advantages of narrow linewidth output, simple structure, stable performance and easy maintenance. In recent years, the use of near-infrared femtosecond laser and phase mask to write FBGs on non-FBGs has attracted wide attention in academia and engineering. Compared with the traditional technique of using ultraviolet pulse laser to write Guang Min fiber, this method has more application value. In this paper, the FBG technique of near infrared femtosecond laser phase mask is studied theoretically and experimentally. In theory, based on the fundamental equation coupled mode theory of fiber grating, the spectral characteristics of sinusoidal refractive index modulated single mode uniform FBG are analyzed, and the influence of FBG structure parameters on its performance is obtained. The reflection spectra of the second order FBG with this refractive index modulation form are simulated, which provides a theoretical basis for the experimental writing of high order FBG. In order to make up for the shortage of coupling mode theory, a numerical method called Rouard, which can be used to analyze the properties of nonuniform FBGs, is introduced, and the reflectance spectra of Gao Si digitally index modulated FBGs are obtained. For the design of femtosecond laser phase mask writing system, based on grating equation and Bragg equation, the influence of phase mask parameters on the interference fringes for writing is analyzed, and the principle of reasonable phase mask design is obtained. The optimum distance range between optical fiber and phase mask is calculated. An experimental system of near-infrared femtosecond laser phase mask is set up to write FBGs on thulium doped fiber and Guang Min fiber successfully. The reflectivity of FBG and the reflectivity of central wavelength are measured to be more than 95%. In view of the limitation of phase mask method, the method of changing phase mask period by lens is analyzed theoretically, and the trend of FBG wavelength changing with tuning parameters is obtained. It is proved that the FBG wavelength can be continuously adjustable in a certain range. By adjusting the distance between phase mask and optical fiber, and the distance between phase mask and tuning lens, FBGs with different center wavelengths are fabricated based on the same block phase mask in a large wavelength range, and the laser output is realized. The all-fiber-optic fiber laser is realized by writing FBG in two different ways. It is proved that using pump optical coupler is the most feasible way to realize hundreds of watts of high-power all-fiber-optic fiber laser in the future. Finally, the output of 2.1 渭 m pulse is realized by using an all-fiber laser pumped by Ho: Yap.
【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】：2010
【分类号】：TN248.1
【共引文献】
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