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Study on testing larger asphericity in non-null interferometer

Optical systems benefit from the use of aspheric surfaces because aspherics provide additional degrees of freedom for aberration control, yielding higher performance while reducing system weight and complexity. But optical designers always avoid to use aspheres with larger asphericity in optical systems mainly for the reason that the test of the steep aspherics requires extraordinary skill of the experimenter and the technical means to reduce the asphericity of the wavefronts that detected by the digital camera. Even though null optics can be adopted to compensate the asphericity of the test wavefront, they are not suitable for many cases. Each aspheric surface requires a unique null optics, which greatly increases a project's complexity, cost and time delay. In this paper, a type of novel lens with large longitude aberration and simple structure is proposed to reduce the asphericity of the wavefronts. The characteristic and the design process of the simple lens are discussed in detail. A comparison between the simple lens and the aplanat with different focus setting is given. Computer simulation shows the simple lens has much more power in reducing asphericity.