1. Field of the Invention
The invention relates to a method for absolute calibration of an interferometer with the aid of a spherical output wave.
The invention relates to a method for determining the measurement accuracy of a recording device for a diffractive optical element.
2. Description of the Related Art
Two methods are used in practice for the absolute determination of the measurement error of interferometers for the purpose of checking the fit of spherical surfaces, specifically the classic three-position test and the rotating-disc method. The main disadvantage of the known methods resides in the low number of absolute calibration methods for interferometers with a spherical output wave. Each method is subject to errors, and in order to determine these more closely it would be very advantageous to have additional absolute calibration methods for comparison.