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http://dx.doi.org/10.3938/jkps.73.1657

Optical Performance Degradation Effects by Fabrication Errors of Circular-type Computer Generated Holograms  

Kim, Young-Gwang (Department of Science of Measurement, University of Science and Technology (UST))
Rhee, Hyug-Gyo (Department of Science of Measurement, University of Science and Technology (UST))
Ghim, Young-Sik (Department of Science of Measurement, University of Science and Technology (UST))
Publication Information
Journal of the Korean Physical Society / v.73, no.11, 2018 , pp. 1657-1662 More about this Journal
Abstract
A null test method which relies on a computer generated hologram (CGH) is widely used to measure a large aspheric surface. For precise measurements of the surface shape of an aspheric optics, the CGH must precisely generate a wavefront that can fit on the ideal surface shape of the aspheric optics. If fabrication errors arise in the CGH, an unwanted wavefront will be generated and the measuring result will lack trustworthiness. Thus far, there has been limited research on wavefronts generated by CGH using only linear-type binary grating models. In this study, a theoretical error model of a circular-type zone plate, the most commonly used types for CGH patterns, is suggested. The proposed error model is checked by simulations and experiments.
Keywords
Computer generated hologram; Optical performance degradation;
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