A study on proton-exchanged and heat-treated LiNbO3 crystals by means of Raman and infrared spectrum

✍ Scribed by Zhi-Yong Zhang

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 149 KB
• Volume: 388
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2006.06.147

✦ Synopsis

A study on LiNbO 3 single-crystal samples obtained by different treatments has been performed by means of Raman and Infrared spectra. Raman scattering spectra show that some modes not only couple each other but also exchange intensities. Two characteristic absorption peaks at 2840 and 2920 cm À1 in Infrared transmission spectra have been found. The results may be attributed to the changes of LiNbO 3 microstructure and the coexistence of two possible phases formed by proton exchange and quick heat treatments, and to the existence of an internal strain induced by the nonuniform thermal expansion during the heat treatment process at high temperature.