Theoretical modelling of the effect of photon lifetime on the output dynamics of Er-doped distributed feedback fibre lasers

By employing a simple model of describing three-level lasers, we have theoretically investigated the effect of photon lifetime on the output dynamics of Er-doped distributed feedback fibre lasers. And based on the theoretical analysis we have proposed a promising method to suppress self-pulsing behaviour in the fibre lasers.

Analysis on a new type magneto-optical disk for blue lasers

The conventional TbFeCo magneto-optical (MO) medium has a relatively smaller Kerr rotation angle in the blue region than in the red. With the recording wavelength gradually moving to the short wavelength, if TbFeCo is still used as recording medium, the conventional MO disk structure must be optimized to get a larger carrier to noise ratio (CNR). Sabi et al. have found that adding a metal layer attached to the TbFeCo film as thermal control layer is a useful way to get a high CNR. In this paper, we proved this through calculation, and carried out optimization of the new type of disk. Calculation results showed that the new structure is useful in preventing an excessive temperature increase, and has a better thermal response. (c) 2005 Elsevier B.V. All rights reserved.

掺杂Nd对GdFeCo薄膜的磁光性能的影响

制备了三元GdFeCo合金薄膜和四元NdGdFeCo合金薄膜,测量了其磁饱和磁化强度对温度的依赖关系、磁滞回线以及可见光范围内的克尔谱.研究了轻稀土Nd掺杂对GdFeCo磁光薄膜的克尔旋转角的影响,发现在一定掺杂范围内能够有效提高薄膜在短波长下的克尔旋转角.掺入适量的轻稀土Nd可以使GdFeCo薄膜在短波长下的磁光性能提高,更好的适用于作为中心孔探测磁超分辨的短波长磁光读出层材料.

部分端面抽运的Nd：YVO4板条固体激光器

利用自制高功率激光二极管（LD）列阵堆和波导整形抽运耦合系统，将抽运光耦合至Nd：YVO4板条晶体，平平腔运转得到了1.064μm的偏振激光输出。在最大抽运功率为84W时，透过率为10％的输出腔镜得到了31W的激光功率输出，光一光效率37％，斜效率45％，板条晶体两个方向的输出光束质量差别较大。为了进一步提高光束质量，使用柱面镜混合腔结构，在最大抽运功率为86W时，得到了19．3W的1064nm激光输出，测得的非稳腔和稳腔两个方向的M^2因子分别为1.4和1．7。