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1 August 1990 Proton-exchanged LiNbO3 optical waveguides
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Proceedings Volume 1274, Electro-Optic and Magneto-Optic Materials II; (1990)
Event: The International Congress on Optical Science and Engineering, 1990, The Hague, Netherlands
Virgin and protOn-exchanged LiNbO3 planar waveguldes are investigated by different spectroscopic methods: ir absorption, Raman scattering and luminescence. Absorption spectra in the region of OH-vibrations are used to study the relationship between the refractive index profile and hydrogen content in the exchanged waveguides. An attempt to support the model suggested on the base of ir data is made by waveguide Raman techniques. In some pure and proton-exchanged samples strong luminescence bands in the region 600-650 nm are observed which make difficult the detection of the Raman signals. The appearance of the luminescence features could be connected with the presence of free lithium metal in the crystal lattice. The increased amount of defects in the wavegulde layers (Initially intrinsic Impurities and extrinsic ones produced by the proton-exchanged process) causes disorder effects in the crystal lattice. The disordered state is eflected in the Raman spectrum of the Internal vibrations of LiNbO3 which can be observed In the spectral region with frequency less than 900 cm1.The observed spectrum consists of narrow "crystalline" lines superimposed on a background resembling to phonon density of states, The crystalline component is induced probably by the penetration of guided light in the crystal substrate while the broad band background is characteristic for the "quasi-lattice" of the wavegulde layer.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ivanka T. Savatinova, Mariana K. Kuneva, and E. Liarokapis "Proton-exchanged LiNbO3 optical waveguides", Proc. SPIE 1274, Electro-Optic and Magneto-Optic Materials II, (1 August 1990);

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