Takeshima Nobuhito, Narita Yoshihiro, Tanaka Shuhei, Kuroiwa Yutaka, Hirao Kazuyuki
Tsukuba Research Laboratory, New Glass Forum, 5-9-9 Tokodai, Tsukuba 300-2635, Japan.
Opt Lett. 2005 Feb 15;30(4):352-4. doi: 10.1364/ol.30.000352.
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.
