Reverse Proton Exchange in Lithium Tantalate Crystals

✍ Scribed by Fedorov, V. A.; Korkishko, Yu. N.

• Book ID: 121431396
• Publisher: Walter de Gruyter GmbH & Co. KG
• Year: 1994
• Tongue: English
• Weight: 333 KB
• Volume: 15
• Category: Article
• ISSN: 0173-4911
• DOI: 10.1515/JOC.1994.15.4.155

✦ Synopsis

We describe the fabrication and properties of optical waveguides formed in Z-cut LiTaO 3 by reverse proton exchange Li + -»H + in the LiNO 3 melts at 280-340 °C. Surface waveguides, supporting TE modes, as well as the buried waveguides for TM modes have been produced. The diffusion constant D 0 and the activation energy Q for the reverse proton exchange process were measured to be 2.95 • ΙΟ 7 μιη 2 /1ι and 97.66 kJ/mol, respectively. Change in ordinary index Δη 0 = -0.034 in H:LiTaO 3 waveguides with An e = 0.026 was estimated from direct measurements.