ABSTRACT
The Martin–Puplett interferometer (mpi) is a polarizing version of the Michelson interferometer. The incoming signal is split into two equal components which are recombined after being directed along paths of differing lengths. The resulting output signal is therefore modified in a way which depends upon the path difference and the signal wavelength. As each of these systems employs the interference which arises when signals are communicated via two separate beam paths, both are referred to as examples of ‘two-beam’ interferometers.
