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计算全息检测非球面具有广泛的应用潜力。但在一般情况下,检测的非球面波差范围是有限的。本文提供和验证了两种扩大计算全息检测能力的方法,其一是计算全息和零位光学系统组合补偿的检测法;其二是象差平衡法制作计算全息图的检测法。此两法把检测非球面波差范围扩大几倍直至近百个λ的波差。所用的线型计算全息图能方便地再现位相型波面。实验证实了这两种方法是可行的。精度分析表明,检测非球面面形偏差时,精度可达λ/10。
Computed holographic detection of aspheric surface has a wide range of potential applications. However, under normal circumstances, the detection of aspheric wave range is limited. This paper provides and verifies two methods to expand the computational holographic detection ability. One is to calculate the compensation method of holographic and zero optical systems, and the other is to detect the hologram by using the method of aberration balance. The two methods to detect the range of aspheric wave to expand several times until nearly a hundred λ wave difference. The linear computed hologram used can easily reproduce the phase-type wavefront. Experiments show that these two methods are feasible. Accuracy analysis shows that the accuracy of the detection of aspherical surface shape up to λ / 10.