All optical implementation of a time-domain ptychographic pulse   reconstruction set-up
  An all optical implementation of pulse reconstruction using time-domain ptychography is demonstrated showing excellent results. Setup and reconstruction are easy to implement and a number of drawbacks found in other second order techniques are removed, such as the beam splitter modifying the pulse under consideration, the time ambiguity, or the strict correspondence between time delay increment and temporal resolution. Ptychography generally performs superior to algorithms based on general projections, requires considerable less computational effort and is much less susceptible to noise. 
Dirk-Mathys Spangenberg, Michael Br\"ugmann, Erich Rohwer, Thomas   Feurer
physics.optics