title: Radially variable reflectivity output coupler of novel design for unstable resonators.
abstract: An output coupler with radially variable reflectivity, based on a Fabry-Perot interferometer made of two suitable spherical mirrors, is proposed. Application to a pulsed Nd:YAG laser with an unstable resonator has produced diffraction-limited output beams with energy up to 300 mJ.
authors.forename: S
authors.initials: S
authors.lastname: De Silvestri
authors.forename: P
authors.initials: P
authors.lastname: Laporta
authors.forename: V
authors.initials: V
authors.lastname: Magni
authors.forename: O
authors.initials: O
authors.lastname: Svelto