A Polygonal Model to Design and Fabricate Ion-Exchanged Diffraction Gratings

Photowritten gratings in ion-exchanged glass waveguides.

The fabrication of an ion-exchanged waveguide beam deflector containing a photowritten grating is described. The planar waveguide was fabricated by thermal K(+) exchange in a borosilicate glass. The grating was written by photobleaching an absorption defect centered at 330 am, which was created by gamma-ray irradiation of the glass. The bleaching was accomplished with the 351-nm line from an ar...

Negligible birefringence in dual-mode ion-exchanged glass waveguide gratings.

Polarization dependence of UV-written Bragg gratings in buried ion-exchanged glass waveguides is investigated. A polarization-dependent shift in Bragg wavelength of less than 0.02 nm is measured, both for the even and the odd modes of a laterally dual-mode waveguide. The measured wavelength shift corresponds to a waveguide birefringence of the order of 10(-5), which is negligible for most appli...

Reactive Ion Beam Etching of Large Diffraction Gratings

Large area Multilayer Dielectric (MLD) diffraction gratings are essential components for temporal pulse compression in high energy laser systems. MLD grating designs typically consist of a silica grating layer on top of a dielectric multilayer reflector. A reactive ion beam etching (RIBE) process using a gridded radio frequency (RF) ion source was developed to uniformly etch the silica grating ...

Photosensitivity and volume gratings in phosphate glasses for rare-earth-doped ion-exchanged optical waveguide lasers

A conceptual model of light coupling by pillar diffraction gratings

Diffractive structures such as pillar gratings are a promising way of coupling light into or out of thin semiconductor devices, for applications in thin film solar cells and light-emitting diodes. In this paper we show that the diffuse transmittance behavior of pillar gratings can be understood using the concept of grating mode interference and that the optimum heights of the grating and an est...