全息透镜的焦距测量

Focal length measurement of holographic lens

本文首先给出了全息透镜像散成像的焦距公式,介绍了用全息光栅法测量全息透镜焦距的原理,对两块自制的全息透镜在原光路再现情况下测量了其焦距,并用另一种参数测量方法对测量结果进行了验证,两者基本相符。通过分别测量全息透镜两个焦距,从而可得出其像散大小。最后指出了使用这种方法应注意的问题。

The astigmatic focal length formulae and the principle of focal length measurement of holographic lens have been introduced and the focal lengths of two self-made holographic lenses are measured under original optical schemes of recording, the results are compared by measuring another parameter and agreed well. The astigmatism of hologpraphic lens could also be measured by measuring its two different focal lengths in orthgraphic directions. Frinatly, some notisfied matters in using this method are pointed out.