准直透镜反射光引起的一个问题

准直透镜主要用于产生平行光束然而,由于其表面的反射作用,在准直后的平行光束中,还存在一束会聚光束这会聚光束与平行光束相比虽很微弱,但在其会聚点附近具有较高的强度,在安排光路时应注意避开它,否则会带来某种程度的干扰本文讨论了这种反射光对全息记录带来的影响和应注意的问题,并根据衍射理论导出了反射光的会聚位置,结果与实验符合甚好.

A PROBLEM CAUSED BY THE LIGHT REFLECTED FROM THE SURFACES OF COLLIMATION LENS

Collimation lenses are usually used for producing a collimated light beam (plane wave).However,because of the reflection of the surfaces,a convergent reflected wave is formed among the collimated laser beam behind the collimation lens.Although the light intensity of the convergent reflected wave is weak compared with the collimated laser beam,yet it is rather strong in the area near to the focus,the recording plate should avoid this area in arranging an optical setup,otherwise it might bring some problems in recording process.In this paper,in consideration to avoid this affect,the position of the focus of the convergent reflected wave is derived by diffraction theory and the results agree well with the experiments.