- Wavefront sensing using speckles with fringe compensationPercival F Almoro
DTU Fotonik, Department of Photonics Engineering, DK 4000 Roskilde, Denmark
Opt Express 16:7608-18. 2008..The numerical phase-error correction system described in this study can be extended to other types of phase errors such as those due to aberrations if optical elements are present in the setup or due to perturbations in the environment...
- Angular displacement and deformation analyses using a speckle-based wavefront sensorPercival F Almoro
DTU Fotonik, Department of Photonics Engineering, Danish Technical University, Roskilde 4000, Denmark
Appl Opt 48:932-40. 2009..The technique offers simple, high resolution, noncontact, and whole field evaluation of three-dimensional objects before and after undergoing rotation or deformation...
- Numerical correction of aberrations via phase retrieval with speckle illuminationPercival F Almoro
Department of Photonics Engineering, Danish Technical University, Roskilde 4000, Denmark
Opt Lett 34:521-3. 2009..Numerical correction of the perturbed wavefront is performed based on rms error and the Strehl ratio. Restoration of the wavefront from a phase object with high spatial frequency content shows the effectiveness of our method...
- Phase microscopy of technical and biological samples through random phase modulation with a diffuserPercival F Almoro
DTU Fotonik, Department of Photonics Engineering, Danmarks Tekniske Universitet, Roskilde 4000, Denmark
Opt Lett 35:1028-30. 2010..The technique offers a whole-field and high-resolution wavefront reconstruction of unstained microstructures. Phase maps of photoresist targets and human cheek cells are obtained to demonstrate the effectiveness of our method...