Testing aspheric surfaces
Advances in aspheric optical fabrication techniques are placing ever-increasing demands on the systems used to test these optics. With techniques such as single-point diamond turning and computer-controlled grinding and polishing, it is now possible to produce aspheric surfaces that cannot be easily or economically tested. And a surface that has not been properly tested is not really finished. Testing can be a substantial portion of the cost of producing an asphere.
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