New Methods for Optical Testing of Large Convex Aspheric Astronomical Mirrors

Non-contact methods for testing of large rotationally symmetric convex aspheric mirrors are proposed. These methods are based on non-null testing with side illumination scheme, in which a narrow collimated beam propagates perpendicular to the axis of testing mirror and when is reflected from its meridional profile. The structure of a reflected beam depends on the shape of mirror. So, to measure the shape of mirror a reflected beam is analyzed. Different techniques for analysis are considered.