用轨迹追踪法计算了平行和锥形毛细管内壁上的光强分布。发现管壁上的光强随距离阶跃式地快速衰减。相同聚焦透镜下,细管的光强衰减比粗管快;大锥角比小锥角衰减快。随着聚焦透镜的F数的增加,光强衰减变慢,平均光强增加。

The light flux on the capillary wall while guiding a laser is simulated in ray tracing method. Calculated results indicate that the light flux on the capillary wall attenuated jumpily along its axis. In the same focus system, the flux decreased more rapidly when the radius of capillary is smaller and the taper angle is larger. The light flux reduced more slowly when the F number of the focus len is larger, and the average flux is increased.