Generalized theory of interference, and its applications

@article{Pancharatnam1956GeneralizedTO,
title={Generalized theory of interference, and its applications},
author={S. Pancharatnam},
journal={Proceedings of the Indian Academy of Sciences - Section A},
year={1956},
volume={44},
pages={247-262}
}

Proceedings of the Indian Academy of Sciences - Section A

SummaryThe superposition of two coherent beams in different states of elliptic polarisation is discussed in a general manner. If A and B represent the states of polarisation of the given beams on the Poincaré sphere, and C that of the resultant beam, the result is simply expressed in terms of the sides,a, b, c of the spherical triangle ABC. The intensity I of the resultant beam is given by:
$$I = I_1 + I_2 + 2 \sqrt {I_1 I_2 } \cos \raise.5ex\hbox{$\scriptstyle 1$}\kern-.1em/ \kern-.15em\lower… Expand