无序介质激光的方向效应

The Directional Effect on Lasing of Random Medium

无序介质激光是由该介质的非周期—类结构与相匹配的泵浦光场相互作用时其整体多重散射的干涉效应产生的。因此其局域模不仅与无序介质被泵浦的功率、面积有关,而且与方向有关。本文以ZnO粉末激光为例,运用传输矩阵的方法计算模拟了其局域模谱的方向效应。

When the quasi-periodic quasi-structure of random medium interacts with matching pump light, the interference effect under its whole multiple scattering leads to lasing in random medium. As a result the localized modes of the random laser is correlative not only with pumping frequency and pumped area, hut also with the incident direction of pump light. In this paper, take the random laser in ZnO powder for example, the directional effect of the localized mode spectrum is simulated by means of transferring matrix method.