It has promising prospect in material processing , laser welding , medicine treatment and military . in this paper , the double - clad fiber , the fundamental principle and key technologies of double - clad fiber laser are introduced 本论文介绍了双包层光纤，对双包层光纤激光器的工作原理进行了论述，分析了它的关键技术及其实现方法。
Results showed that it was realizable by taking such measures as using high inner - clad numerical aperture , appropriate rare - earth doped double - clad fiber and decreasing transmission loss of sunlight 计算结果表明，通过采用内包层数值孔径较大、掺杂适当稀土元素的双包层光纤及减小太阳光传输过程中的损耗等措施提高光纤激光器对太阳能的吸收效率，可以实现太阳能直接抽运光纤激光器。
The principle of double cladding fiber laser is analyzed , simply illustrated the principle and drawbacks of noncoherent beam combination , the coherent beam combination method of multiple optical power amplifier and its advantages are discussed in detail 分析了双包层光纤激光器的工作原理，简单介绍了非相干组束的原理和缺陷，重点阐述了并联主振荡相干组束方法及相干组束的优势。
The research of er3 + / yb3 + co - doped fiber laser and amplifier is carrying in experiment . the er3 + / yb + co - doped double cladding fiber is produced by ino , the pumping resource wavelength is 977nm , the maximum pumping power coupling into inner cladding is 1 . 33w 公司拉制的e尸+ / yb3 +共掺双包层光纤，泵浦源的波长为977nm ，最大输出功率为2 . 46w ，实际祸合到双包层光纤中的最大功率为1
In the yb3 + - doped single or double clad fiber lasers by using few - mode fiber bragg gratings as wavelength reflectors , the linewidth of the output laser is smaller than 0 . 1nm , which shows that such a scheme can produce narrow linewidth laser 最吸引我们的是使用这种光纤光栅做为腔镜组成的掺yb3 +单包层和双包层光纤激光器有着小于0 . 1nm的3db带宽,说明少量模光纤布拉格光栅具有较窄的反射峰。
The amplification characters of er3 + / yb3 + co - doped fiber are studied in our experiments . when the doped fiber length is 50cm , the amplified signal power is 170mw and the gain is 12 . 2db in the case of signal power of 10 . 8mw and pumping power of 2 . 5w 本论文着重研究了采用一级放大时，信号光在双包层光纤中的放大特性，截取50cm的光纤，在输入泵浦光功率为2 . 5w ，信号光功率为10 . 8mw时，获得了170mw的放大信号光输出，增益为12 . 2db 。
The dissertation focuses on the yb3 + - doped double clad fiber laser . the research works in detail are shown as follows : 1 . with the phase - mask method , we make a fiber bragg grating in a few - mode fiber whose cut wavelength is greater than 1060nm 本论文围绕着掺yb3 +双包层光纤激光器进行研究工作,报告了得到的科研成果,包括以下的内容: 1 .在截止波长高于1060nm的少量模光纤中用相位掩模法写入布拉格光纤光栅,制作的布拉格光栅具有几个透射峰。
In this paper , by using the method of geometrical optics and the theory of fiber optics mode , we analyzed difference characteristics of double - clad fiber andthe effect of all kinds of dcf ' s inner - cladding structures on1 the absorption efficiency of dcf and its laser 因此在本论文里采用几何光学和纤维光学模式理论的方法分析了不同内包层结构的双包层光纤对光纤激光器性能的影响，建立理论分析模型，并设计了新型内包层结构的双包层光纤。
The new fiber laser , including photonic crystal fiber ( pcf ) laser and multi - core double - clad fiber laser , was analyzed . one of novel structure . dcf laser that will be used into high power output was put forward based on the theoretic analysis 分析了新型光纤激光器(如光子晶体光纤激光器及多纤芯双包层光纤激光器)的基本原理及发展现况，设计了一种新型可实现高功率输出的双包层光纤激光器结构，并从理论分析出发给出其工作原理及制作方法。
2 . considering the energy level structure and the spectrum characteristics of yb3 + ion , we deduce the relationships between laser performances of yb3 + - doped double clad fiber laser and parameters of laser cavity from the steady state rate equations with a new model 2 .讨论了yb3 +离子的能级结构和光谱特性,并从稳态速率方程,结合谐振腔结构特点采用ido kelson和amos hardy的模型,给出了双包层光纤激光器的输出特性与激光器谐振腔结构参数的关系准解析表达式。
