Martin–Puplett interferometer

A Martin–Puplett interferometer measures the difference between the powers of two input beams.^[1] It is similar to a Michelson interferometer, except in a Martin Puplett interferometer the beam splitters are wire grid polarizers instead of half-silvered mirrors, and mirrors in the beam path are rooftop mirrors to flip the polarization of the light reflecting off of them by 90 degrees. ^[2] Martin-Puplett interferometers are set up with two imput ports and two output ports.

References

1. ^ "Martin–Puplett Interferometer", World of Science, Wolfram Research
2. ^ Britt Reichborn-Kjennerud (July 2004). "Following the Polarization of a Martin-Puplett Interferometer". Columbia University. http://calvin.phys.columbia.edu/group_web/fts_development/download/mp_polarization.pdf.