【作者】 侯宇；

【导师】 周桂耀；

【作者基本信息】 燕山大学 ， 电路与系统， 2010， 硕士

【摘要】 随着信息技术的进步,光纤通信网络正在向高速率、大容量发展,实际应用对光纤性能提出了越来越高的要求。双包层光子晶体光纤作为大功率激光器的传输载体,它的特性越来越受到人们的关注。此外,掺镱玻璃也是制作大功率激光器不可缺少的激光介质,人们开始试图将掺镱玻璃介质与光子晶体光纤相结合,制备超大功率的掺镱光子晶体光纤激光器。本论文从理论上分别对新型双包层光子晶体光纤的色散特性和掺镱激光玻璃的光谱特性进行了分析。并且,采用坩埚高温熔融法制备了几种不同组份的掺镱激光玻璃,为制备大功率激光器奠定了基础。论文主要内容包括:首先,以多极法理论为基础,设计了一种新型双包层结构的光子晶体光纤。通过改变其五层空气孔的三个结构参数(内层空气孔直径,外层空气孔直径,八边形孔间距),理论上实现了色散绝对值在1.32~1.7μm的波段内变化仅为1.55 ps/km/nm的平坦色散特性。并且在此基础上对其限制损耗进行了数值模拟。其次,采用坩埚高温熔融法制备了一系列的掺镱硅酸盐激光玻璃,测试了硅酸盐玻璃的各项性能参数,分析了稀土离子掺杂浓度和玻璃组份变化对激光玻璃光谱特性的影响。最后,对制备出的五种不同组份的掺镱硅酸盐激光玻璃的荧光光谱和吸收光谱进行了分析,从而获得了最佳玻璃组份和工艺条件,对今后的实验具有一定的指导意义。更多还原

【Abstract】 With the development of information technology, The optical fiber communication network is evolving towards high speed and large capacity and the practical application proposed higher and higher request to the fiber performance. The double-cladding Photonic Crystal Fiber (PCF) which contacts with high-power laser is a important field investigated. Besides, Yb3+doped laser glass is also an indispensable medium of the high-power laser. With the birth of photonic crystal fiber, people start trying to make combination of Yb3+doped glass medium with Photonic Crystal Fiber because of its superior optical properties, which will be the ideal medium for the preparation of ultra-high-power lasers.The dispersion characteristic of a new double-cladding Photonic Crystal Fiber and the characteristics of Yb3+doped laser glass are investigated respectively in this paper. Moreover, Yb3+doped glass is prepared by high-temperature crucible melting method and. has laid the foundation for the preparation of high-power laser .The main results are summarized as follows:Firstly, based on multi-pole method, a kind of new double-cladding Photonic Crystal Fiber is put forward. It has been shown theoretically that it is possible to obtain ?attened dispersion within the wave band of 1.32 to 1.7μm by altering three parameters of the five-ring double-cladding PCF (the diameter of the inner ring holes, the diameter of the outer four rings holes, the pitch of the octagon), and the absolute value of dispersion coefficient merely changes 1.55 ps/km/nm. Moreover, simulation results show that this PCF can assume low confinement losses near the1550 nm wavelength range.Secondly, a series of Yb3+doped silicate laser glass were prepared by high-temperature crucible melting method, the fluorescence spectra parameters such as spectral properties were tested. The impact of rare earth ions doping concentration and glass composition changes on the glass spectrum were analyzed.Finally, The fluorescence spectrum and the absorption spectrum of five ingredients different mixed the Yb3+doped silicate laser glass have carried on the analysis, obtained an ingredient allocated which has the best data, laid the foundation for further experiment.更多还原