A new non-iterative self-referencing interferometer in optical phase   imaging and holographic microscopy, HOLOCAM
  Phase retrieval and imaging phase measurements are fields of intense research. It has recently been shown that phase retrieval from self-referencing interferograms (SRI) can be reformulated leading to a stable, linear equation provided the amplitude of the field is known from prior measurement steps (HOLOCAM). Consequently, the numerical solution thereof is straightforward. This is a big achievement since convergence is otherwise not always guaranteed. Applications are expected in X-ray microscopy, general phase retrieval, holography, tomography and optical imaging. 
Martin Berz and Cordelia Berz (IFE Institut f\"ur Forschung und   Entwicklung, Munich/Germany)
physics.ins-det physics.optics