title: Gouy phase of nonparaxial eigenmodes in a folded resonator.
abstract: We study the effect of nonparaxiality in a folded resonator by accurate measurements of the Gouy phase as a function of the mode number for mode numbers up to 1500. Our experimental method is based on tuning the resonator close to a frequency-degenerate point. The Gouy phase shows a nonparaxial behavior that is much stronger in the folding plane than in the perpendicular plane. Agreement with ray-tracing simulations is established, and a link with aberration theory is made.
authors.affiliation: Leiden University, Huygens Laboratory, PO. Box 9504, 2300 RA Leiden, The Netherlands. tklaassen@molphys.leidenuniv.nl
authors.forename: Thijs
authors.initials: T
authors.lastname: Klaassen
authors.forename: Arthur
authors.initials: A
authors.lastname: Hoogeboom
authors.forename: Martin P
authors.initials: MP
authors.lastname: van Exter
authors.forename: J P
authors.initials: JP
authors.lastname: Woerdman