title: Fabrication of high-efficiency diffraction gratings in glass.
abstract: We investigated a microfabrication process for optical gratings with periods of micrometer order that use ultrafast laser pulses in semiconductor-doped glass. ZnS- or PbS-doped SiO2-A12O3-B2O3-CaO-ZnO-Na2O-K2O glass was prepared by a melting method. Glass transmission diffraction gratings with a high refractive-index difference were fabricated with femtosecond laser pulses. The first-order diffraction efficiencies of these gratings were approximately 80%, and the first-order diffraction angles of these gratings were 8 degrees at telecommunication wavelengths.
authors.affiliation: Tsukuba Research Laboratory, New Glass Forum, 5-9-9 Tokodai, Tsukuba 300-2635, Japan. takesima@ngp.trc-net.co.jp
authors.forename: Nobuhito
authors.initials: N
authors.lastname: Takeshima
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Narita
authors.forename: Shuhei
authors.initials: S
authors.lastname: Tanaka
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Kuroiwa
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Hirao