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Dual-wave-front computer-generated holograms for quasi-absolute testing of aspherics

机译:双波前计算机生成的全息图,用于非球面的准绝对测试

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摘要

Testing of aspherics by means of computer-generated holograms (CGHs) is well known. To perform a quasi-absolute test of rotationally symmetric aspheric surfaces, two wave fronts must be encoded in the CGH. Both the null lens and a spherical lens have to be stored. This enables successive measurements of the aspheric and of a cat's-eye position without changing the object arm of the interferometer. Two possibilities for encoding both wave fronts have been investigated. A first-order approximation for estimating the influence of disturbing diffraction orders is given. (C) 2002 Optical Society of America. [References: 8]
机译:通过计算机生成的全息图(CGH)测试非球面是众所周知的。要对旋转对称的非球面进行准绝对测试,必须在CGH中对两个波前进行编码。空透镜和球面透镜都必须存储。这样就可以连续测量非球面和猫眼位置,而无需更改干涉仪的物镜臂。已经研究了对两个波前进行编码的两种可能性。给出了用于估计扰动衍射阶次影响的一阶近似。 (C)2002年美国眼镜学会。 [参考:8]

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