title: Apodizing holographic gratings for the modal control of semiconductor lasers.
abstract: We first present the fabrication technique of apodizing holographic gratings. Gratings with a spatially variable reflectivity profile were obtained by the interference of two Gaussian beams on a glass plate covered with a photoresist. When the exposure time was short enough to avoid saturation of the photoresist, gratings with a quasi-Gaussian reflectivity profile for the beam reflected in the -1 order were produced; the reflectivity at the center could be as high as 71%, and the half-width of the reflectivity profile at the e(-1) position could be as small as 180 mum. Apodizing gratings were used as the end mirror of the external cavity of a broad-area semiconductor laser. Single longitudinal- and lateral-mode operation was observed over the full range of allowed injection currents.
authors.forename: J F
authors.initials: JF
authors.lastname: Lepage
authors.forename: R
authors.initials: R
authors.lastname: Massudi
authors.forename: G
authors.initials: G
authors.lastname: Anctil
authors.forename: S
authors.initials: S
authors.lastname: Gilbert
authors.forename: M
authors.initials: M
authors.lastname: Piché
authors.forename: N
authors.initials: N
authors.lastname: McCarthy