SINGLE-PROBE-BEAM DIFFERENTIAL AMPLITUDE AND PHASE-SCANNING INTERFEROMETER

We describe a common path differential amplitude and phase interferome ter capable of measuring differential amplitude and phase responses si multaneously. The system uses a single probe beam that is imaged onto the detector plane; differentiation in any direction can be performed by the alteration of the position of the detectors. Experimental and t heoretical results, which show excellent agreement, are presented to d emonstrate how the transfer function of the system can be controlled t o suit different application areas. (C) 1997 Optical Society of Americ a.