title: Variable reflectivity unstable resonators for coherent laser radar emitters.
abstract: Beam properties obtained from a TE CO(2) laser in a Cassegrain resonator using various graded reflectivity mirror couplers are compared. It is shown that, experimentally, Gaussian profiles maximize the far-field intensity while parabolic profiles yield more uniform near fields with a lower energy extraction. Both configurations appear suited for coherent ladar systems.
authors.forename: A
authors.initials: A
authors.lastname: Parent
authors.forename: P
authors.initials: P
authors.lastname: Lavigne