title: Collimating properties of an axicon for the Čerenkov-radiation-type second-harmonic light from a crystal-cored fiber.
abstract: The optical second-harmonic wave generated from a crystal-cored fiber from the Čerenkov-radiation-type phase matching can be collimated by an axicon and then can be focused by a spherical lens to a diffraction-limited spot. Tolerance of the optical system to meet the Maréchal criterion is analyzed; tolerable maximum errors in alignment and fabrication of the axicon lens are evaluated.
authors.forename: K
authors.initials: K
authors.lastname: Chikuma
authors.forename: S
authors.initials: S
authors.lastname: Okamoto
authors.forename: T
authors.initials: T
authors.lastname: Tohma
authors.forename: S
authors.initials: S
authors.lastname: Umegaki