Abstract

A method is proposed for measuring the wavefront aberration of a fast aspherical surface. The combination of the Ronchi test and the synchronous phase detection method provides a simple but powerful tool for aspherical surface evaluation. In a common setup for the Ronchi test, translating the Ronchi ruling sideways causes the irradiance of the Ronchigram to vary periodically with time. This enables us to make synchronous phase detection in the Ronchi test. The procedure for Ronchigram analysis is presented, and experimental results are shown.

© 1984 Optical Society of America

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