Single-shot 3 × 3 beam grating interferometry for self-imaging free extended range wave front sensing
Krzysztof Patorski , Łukasz Służewski , Maciej Trusiak
AbstractCrossed grating 3×3 beam lateral shear interferometry for extended range wave front sensing is presented. A Fresnel diffraction pattern of two multiplicatively superimposed linear diffraction gratings each generating three diffraction orders is recorded. A simple solution employs a common crossed binary amplitude Ronchi grating with spatial filtering. Digital processing of a single-shot pattern includes separating multidirectional pairs of orthogonal lateral shear interferograms, retrieving second harmonics of their intensity distribution, and calculating shearing phases. Single-frame automatic fringe pattern processing based on the Hilbert–Huang transform is used for this purpose. Using second harmonics extends the aberration measurement range since they encode self-imaging free two-beam interferograms without contrast modulations. Experimental works corroborate the principle and capabilities of the proposed approach.
|Journal series||Optics Letters, ISSN 0146-9592|
|Publication size in sheets||0.5|
|Keywords in English||Interferometry; Talbot and self-imaging effects; Diffraction and gratings|
|Score|| = 35.0, 28-11-2017, ArticleFromJournal|
= 45.0, 28-11-2017, ArticleFromJournal
|Publication indicators||: 2016 = 3.416 (2) - 2016=3.228 (5)|
|Citation count*||2 (2018-02-20)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.