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Complex studies of proton exchange doping of LiNbO, and LiTaO, single crystals are carried out to investigate the regularities and specific features of structural changes and optical parameters of waveguiding layers. I n fact, depending on doping melt type and crystalline cut H:LiNbO, waveguides can involve two to six and H : LiTaO, up to three layers with different properties.A qualitative description of the proton exchange mechanism is suggested. Mi% dem Ziel der Untersuchung von GesetzmliSigkeiten und Besonderheiten vonStrukturumwandlungen und Eigenschaften planarer Lichtleiter werden Komplexuntersuchungen zum Protonen-Lithium-Austausch an LiNbO, und LiTaO, Kristallen durchgefuhrt. Es wird gezeigt, daD in Abhangigkeit vom Schmelsentyp und der kristallographischen Orientierung der Plattenoberflache H:LiNbO,-Lichtleiter aus zwei bis sechs und bei H:LiTaO, aus bis zu drei Schichten mit verschiedenen Eigenschaften bestehen konnen. Es wird eine qualitative Beschreibung des Protonen-Lithium-Austausch gegeben. PE Waveguides in LiNbO3Ag+, T1+, Cu+, and K+ ions can take part in the I E process forming waveguides in LN [6 to 81, and also protons [9]. A considerable number of works on PE has been published. The analysis of all known doping melts indicates that they can be classified into two types. Melts of type 1 (1-melts) are those that facilitate H:LiNbO, waveguide formation with Y-cut crystals featuring more than one mode, and without surface destruction. On the other hand, stongly acidic melts with a high intensity of PE are of type 2 (2-melts). Direct Y-cut waveguide formation in 2-melts is impossible because of high H+ saturation of the surface and its destruction. ') SU-103498 MOSCOW, USSR-.

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