Optical test of aspheric lenses using instantaneous wedge plate phase shifting lateral shearing interferometer

摘要

In the optical testing of aspheric lenses, the phase shifting lateral shearing interferometer has attracted considerable attention because of its advantage in alignment work. And many phase shifting lateral shearing interferometers were developed. But all of them are time delayed methods which have the time lag between the measurements. When air turbulence and vibration is present, this time lag can be onerous error sources. If we measure all the required interferograms for the phase shifting method at the same time, there should be no time leg. We present a simple instantaneous phase shifting lateral shearing interferometer using a wedge plate and two identical transmission gratings and reconstruct the wavefront error of measured instantaneous phase shifting lateral shearing interferograms.