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Polarization interferometry is normally not a regular topic in the class room at graduate level. Therefore a polarization heterodyne interferometer similar to a Michelson interferometer using polarizing components is discussed in this paper to demonstrate the interference of two orthogonal polarized beams. The measurement of the phase shift as a result of orientation of polarizer is performed by recording corresponding fringe shift. The theoretical expression is also presented using Jones calculus for the fringe shift as a function of azimuth of the polarizer. The experimental set-up is simple and can be very well incorporated in the teaching laboratory. Summary Polarization interferometry is normally not talked about at graduate level neither in theory and nor in laboratory. The students go with the concept that two different polarized light always result in a fringe free pattern. In this paper, a simple configuration similar to Michelson interferometer using polarized components is reported for the interference of two orthogonally polarized light in the class room. The measurement of the phase shift as a result of orientation of polarizer is performed. The theoretical expression is also presented for the fringe shift as a function of azimuth of the polarizer. The common method to realize relative phase shift in an optical beam of the Michelson interferometer in the class room is by physically changing the optical path of one of the arm of the interferometer either by translating mirrors or by introducing the optical surfaces in the form of glass plate1 in a controlled way. This phase shift is observed either in the form of fringe shift or some modification in the interference pattern. With one or more rotating polarizing components viz; polarizer, quarter wave plate or half wave plate, phase shift can also be observed2-5. In this paper, we report the effect of azimuth angle of polarizer in the output plane of two orthogonally polarized interfering beams from a heterodyne interferometric setup. The experimental set-up presented below is simple and can be handled by the graduate students independently. Experimental setup and Theory A collimated laser beam was launched into an interferometric setup, as shown in fig.1. The polarizer P1 was aligned at 45 0 ensures 50-50 splitting of light from polarizing beam splitter (PBS). The transmitted beam (only p-polarized light) from PBS passed through Quarter Wave Plate Q2 (QWP at 45 0 ) converted into right circularly polarized (r.c.p.) light. The r.c.p. beam reflected from mirror M2, became left circularly polarized (l.c.p.) and passed back through Q2. It turned into s-polarized light and reflected completely from PBS. The reflected beam (only s-polarized light) after passing through Q1, M1 and

Phase shift via polarizer in an heterodyne interferometer