These results are very important when optimizing the structure of a double - clad fiber laser . 3 这些理论分析为双包层光纤激光器的实验研究具有很大的指导意义。
We analysis the characters of double - clad fiber laser with mode selected based on fiber bragg grating in double - clad fiber 对光纤bragg光栅选频双包层光纤激光器的特性进行了分析。
In this thesis , the dispersion relation ( eigen value equation ) of dispersion compensation fibers is obtained by a scalar - wave analysis 本文首先用标量近似法推导了色散补偿光纤的色散方程，这个结论适用于任何三包层光纤结构。
D . c hanna , r . m percival . continuous - wave oscillation of a monomode ytterbium - doped fibre laser [ j ] . electronics letters , 1988 , 24 ( 17 ) : 1111 - 1113 张强.掺镱双包层光纤激光器实验研究及圆盘光纤激光器设计[ d ] .硕士学位论文, 2003年,天津大学
3 . we study how to improve the pump efficiency in a double clad fiber laser . several traditional pumping methods are considered and the light propagation 其中双包层光纤的结构、内包层的形状、泵浦光入纤方式等是这项技术的关键所在。
The double - clad fiber ( dcf ) with truncated inner cladding has much better absorption efficiency to optical waves than dcf with circular inner cladding 摘要缺陷型内包层双包层光纤由于其特殊的内包层横截面结构，对于光波的吸收效率要比理想圆型内包层双包层光纤提高许多。
To sum it up , some optimization methods of the dcfls design are gained in this dissertation , and all these methods can conduct the experiment of dcfls 通过对多点泵浦光纤激光器的数值和理论分析,得出了一些有用的结论,这些结论对双包层光纤激光器的结构优化具有指导意义。
The littrow grating tuning method is employed for the first time in double cladding fiber lasers . by tuning the angle of the grating , we have achieved a tuning range of more than 40nm . 6 （ 5 ）首次将littrow光栅调谐技术应用到掺双包层光纤激光器中，实现了可调谐包层泵浦光纤激光器，波长可调谐范围大于40nm 。
4 . we have studied the fiber bragg gratings formed in double - clad fibers , with and without hydrogen loaded , via the phase - mask method . a phase - shifted moir fiber bragg grating is also fabricated in double - clad fiber 四、对在双包层光纤中制作光纤光栅进行了研究,制作出了一种用于双包层光纤激光器选频的光纤光栅。
From the theoretic analyses , we draw the conclusion that the pump power can be heighten by adopting the eccentric core double - clad fiber . and we put forward a new coupling technology : micro - prism technology 通过理论分析得出了用偏芯型双包层光纤可以进一步提高泵浦功率的结论。并提出了一种新型的泵浦光耦合技术：微型棱镜技术。
