Open AccessA novel operating principle in speckle interferometry: the double-focusing
Author(s) -
Luigi Bruno,
Andrea Poggialini
Publication year - 2007
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.15.008787
Subject(s) - optics , astronomical interferometer , interferometry , physics , holography , speckle imaging , michelson interferometer , holographic interferometry , electronic speckle pattern interferometry , speckle pattern , reference beam , mach–zehnder interferometer
The present paper describes in details the operating principle of a completely new family of speckle interferometers: the double-focusing. This type of interferometer is sensitive to the same components of displacement given by holographic interferometry, i.e. the component along the bisector of the angle identified by the illumination and the observation directions. In addition, no external reference beam is necessary, with a consequent reduction of the complexity of the experimental setup. The only requirement for the correct functioning of this family of interferometers is that only a portion of the illuminated area undergoes a sensible deformation. The implementation can be indifferently carried out by adopting the classical Michelson or Mach-Zender configurations, but also a particularly compact in-line implementation can be realized.