title: Laser mirrors with variable reflected intensity and uniform phase shift: design process.
abstract: Optical coatings with circularly symmetric graded reflectance are used as laser mirrors in unstable resonators. A proper design of such coatings permits any maximum central reflectance to be obtained along with a null external reflectance. Different design approaches are discussed, and an optimized design that gives negligible distortion of the reflected and transmitted wave front is proposed. Coatings with super-Gaussian and step reflectance profiles are examined as two different solutions for improving laser beam quality.
authors.forename: A
authors.initials: A
authors.lastname: Piegari
authors.forename: G
authors.initials: G
authors.lastname: Emiliani