Regensburg 2004 – wissenschaftliches Programm
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DS: Dünne Schichten
DS 1: Ionenimplantation I
DS 1.8: Vortrag
Montag, 8. März 2004, 11:15–11:30, HS 31
Properties of buried waveguides produced by He-irradiation in KTP and Rb:KTP — •F. Schrempel1, Th. Opfermann1, J.-P. Ruske2, U. Grusemann2, and W. Wesch1 — 1Friedrich-Schiller-Universität Jena, Institut für Festkörperphysik, Max-Wien-Platz 1, D-07743 Jena — 2Friedrich-Schiller-Universität Jena, Institut für Angewandte Physik, Max-Wien-Platz 1, D-07743 Jena
Buried waveguides were produced by He-irradiation with energies between 1 and 3 MeV and ion fluences, which are sufficient to generate multiple buried amorphous layers in KTP and Rb:KTP, respectively. Within these layers the refractive index is decreased and they act as barriers for light guiding. The irradiation also causes the formation of defects within the waveguide, reducing the optical transmittance. By post-irradiation thermal annealing light scattering and absorption inside the waveguides are significantly reduced. In the case of Rb:KTP rapid thermal annealing up to temperatures of of 770 K was found to be suitable to abolish point defects and to prevent the Rb-diffusion at the same time. Due to adjacent regions of different refractive indices non symmetrical electric field distributions are obtained within the waveguide. For the completely irradiated waveguides the homogeneous refractive indexes around the waveguide cause fiber like symmetrical electric field distributions in a singlemode waveguide undisturbed by surface effects. The samples were analyzed by means of various complementary methods (Rutherford backscattering spectrometry, cross-sectional transmission electron microscopy, m-line spectroscopy). The nearfield pattern and the attenuation of the waveguides were measured.