Challenges in holographic measurement of aspheric and freeform optical components shape

摘要

The use of Aspherical and free form components is not any more the domain of very special applications and systems. Ever growing demand for better performing systems is pushing hard on its use in an ordinary applications. However the measurement of such components is still challenging because of three main reasons, it is slow, the accuracy is generally not satisfying, the measurable shapes are still rather limited. We developed holographic method for measurement of diffusive aspheric and freeform surfaces. Our recent efforts are focused on method modification which would enable to apply it in measurement of complex polished surfaces. This efforts show up to be rather difficult one. We proposed many improvements of the previously introduced method. We built up several setups, where we tested our assumptions. The first results are positive and some of them are published here. However many problems are still awaiting unaddressed and have to be solved before the method could be used with success. In this paper we are also discussing the shortcomings of the proposed method.