Article

Interferometric evaluation of angular displacements using phase retrieval.

DTU-Fotonik, Department of Photonics Engineering, Danish Technical University, Roskilde, Denmark.
Optics Letters (impact factor: 3.4). 10/2008; 33(18):2041-3. pp.2041-3
Source: PubMed

ABSTRACT Phase retrieval is carried out using sequential intensity measurements of a volume speckle field and a wave propagation equation. Retrieved phases and phase subtraction facilitate the analysis of wavefronts before and after undergoing a small rotation. Angular displacement between incident planar wavefronts is determined from the unwrapped phase difference, phase diffuser aperture diameter, and the light source wavelength. Numerical simulations confirm the experimental results.

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Keywords

Angular displacement
 
phase diffuser aperture diameter
 
Phase retrieval
 
Retrieved phases
 
undergoing
 
volume speckle field
 
wave propagation equation