Characterization of uniaxial crystals through the study of fringe patterns

FRANCISCO E VEIRAS; GERVASIO D PEREZ; MARIA T GAREA; LILIANA I PEREZ

Lima

Congreso; 7th Ibero-American Conference on Optics- 10th Latin-American Meeting on Optics, Lasers and Applications; 2010

Pontificia Universidad Católica del Perú

The fringe pattern obtained when a divergent (or convergent) beam goes through a  sample  of  birefringent  crystal  between  two  polarizers  contains  information  which  is  inherent of the crystalline sample under study.    On the other hand, by considering the design details of the experience and the parameters that are characteristic of the uniaxial plate, it is possible to theoretically  obtain  the  luminous  intensity  corresponding  to  each  point  on  a  screen  or  CCD. Thus,  this  theoretical  model  allows  us  to  obtain, from  images  experimentally  obtained  and theoretical expressions, the parameters that are characteristic of the plates.  The results obtained  proved  the  concordance  between  theory  and  experience  while  endorsing  this  technique  for  the characterization of birrefringent crystals and devices based on this type of materials.