POLARIZATION INTERFEROMETER WITH 2-FREQUENCY PHASE MODULATION

This paper proposes the optimum combination of a compact interferomete r with a reverse circular path of the working and reference beams and a two-frequency phase modulator. The interferometer is a modulated Aug ustyn interferometer in which the usual beam-splitting cube is replace d by a polarization beamsplitter. Tests of a prototype of the proposed system showed that it is promising as a wavefront sensor of an adapti ve telescope. The experimental resolution of the system was lambda/100 .