Optical computation of the Laplace operator using phase-shifted Bragg grating Bykov, Dmitry A. ; Doskolovich, Leonid L. ; Bezus, Evgeni A. ; Soifer, Victor A. Abstract Publication: Optics Express Pub Date: October 2014 DOI: 10.1364/OE.22.025084 Bibcode: 2014OExpr..2225084B