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1 December 1991 H:LiNbO3 optical waveguides made from pyrophosphoric acid
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Proceedings Volume 1583, Integrated Optical Circuits; (1991)
Event: OE Fiber, 1991, Boston, MA, United States
Efforts are made to correlate the hydrogen presence in proton-exchanged waveguides with their modal properties and vibrational spectra. The exchange process was performed by immersion Z-cut substrates in molten pyrophosphorlc acid at 240 °C for 8 h, thus realizing technological conditions similar to those for waveguides made previously by us from benzoic acid. The number of modes obtained in such type of waveguides was high enought (10-20) to ensure precise profile reconstructions by using the IWKB method. A surface refractive index change of 0.148 was obtained at y=632.8 nm. The exchanged samples were subjected to subsequent annealings for 1 h through 20° starting from 200 °C. Reflection High Energy Diffraction (RHEED), optical measurements and vibrational (IR and Raman) spectra were used at each stage of annealing in order to follow the guide characteristics. Seme correlations between optical profiles and vibrational spectra have been found which allow to make conclusions about the substitution degree and the structure of exchanged layers.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
C. C. Ziling, L. Pokrovskii, N. V. Terpugov, Mariana K. Kuneva, Ivanka T. Savatinova, and Mario Nicola Armenise "H:LiNbO3 optical waveguides made from pyrophosphoric acid", Proc. SPIE 1583, Integrated Optical Circuits, (1 December 1991);


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