Observation of the geometric amplitude factor in an optical system Bouwmeester, D. ; Karman, G. P. ; Dekker, N. H. ; Schrama, C. A. ; Woerdman, J. P. Abstract Publication: Journal of Modern Optics Pub Date: October 1996 DOI: 10.1080/09500349608232872 Bibcode: 1996JMOp...43.2087B