Interferometric evaluation of angular displacements using phase retrieval.
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.
Almoro
Percival F
PF
DTU-Fotonik, Department of Photonics Engineering, Danish Technical University, Roskilde, Denmark. percival.almoro@risoe.dk
Pedrini
Giancarlo
G
Anand
Arun
A
Osten
Wolfgang
W
Hanson
Steen G
SG