title: Reflective integrated optical elements produced by ion exchange in glass.
abstract: The use of total reflection at the boundary between the guiding region and the substrate (or another guiding region) to implement waveguide achromatic elements is discussed. Two geometries of the boundary, parabolic and elliptical, are proposed and analyzed. The parabolic boundary was fabricated by selective ion exchange, and both its focusing capabilities and the compatibility of its numerical aperture with optical fibers are demonstrated.
authors.forename: X
authors.initials: X
authors.lastname: Prieto
authors.forename: J
authors.initials: J
authors.lastname: Liñares