Fabrication of high-efficiency diffraction gratings in glass.
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.
Takeshima
Nobuhito
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Tsukuba Research Laboratory, New Glass Forum, 5-9-9 Tokodai, Tsukuba 300-2635, Japan. takesima@ngp.trc-net.co.jp
Narita
Yoshihiro
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Tanaka
Shuhei
S
Kuroiwa
Yutaka
Y
Hirao
Kazuyuki
K