Spiral Fringes and Fringe Dislocations in GRIN Rod Testing

@inproceedings{MontoyaHernndez2000SpiralFA,
  title={Spiral Fringes and Fringe Dislocations in GRIN Rod Testing},
  author={Marcial Montoya-Hern{\'a}ndez and Daniel Malacara-Hern{\'a}ndez},
  year={2000}
}
Birefringence in rods with a gradient refractive index (GRIN rods) is caused by anisotropic stresses produced in the doping process that is used to introduce its inhomogeneity. Due to this birefringence the interferograms produced by a modified Mach-Zehnder shows spiral fringes and fringe dislocations. Mathematical description of phenomenon agree roughly with measurements. 
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