The appearance of interference blots and of the dislocation of interference fringes is studied by means of modeling an arbitrary inhomogeneous birefringent medium with rotating principal optical axes by a system of two birefringent plates. A theoretical explanation of these irregularities is given. Conditions for the appearance of interference blots and fringe dislocations are derived. A method of classification of singular points in the fringe patterns is presented.
© 1998 Optical Society of America
H. Aben and L. Ainola, "Interference blots and fringe dislocations in optics of twisted birefringent media," J. Opt. Soc. Am. A 15, 2404-2411 (1998)