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Influence of doping on OH absorption in LiNbO3 crystals

✍ Scribed by R. K. Choubey; B. Q. Khattak; S. Kar; P. Ramshankar; P. Sen; K. S. Bartwal

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
124 KB
Volume
42
Category
Article
ISSN
0232-1300

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✦ Synopsis

Abstract

Undoped, Cr doped and Mg, Cr codoped LiNbO~3~ crystals were grown by conventional Czochralski technique. Comparative study was carried out using Fourier transform infrared (FTIR) and UV‐Visible spectroscopy. Infrared optical absorption for OH^–^ ion has been used to study the effect of dopants on the crystals. The peak position of OH^–^ shift to 3535 cm^‐1^ for Mg, Cr codoped crystals compared to 3484 cm^‐1^ for undoped and Cr doped crystals. Prominent absorption bands are found in the visible region centered at 480 nm (20833 cm^‐1^) and 653 nm (15313 cm^‐1^) in Cr doped crystals. Whereas in Mg, Cr codoped crystals these broad absorption bands are red shifted to 517 nm (19342 cm^‐1^) and 678 nm (14749 cm^‐1^). UV cutoff in Cr doped crystals shift towards higher wavelength compared to undoped LiNbO~3~ crystals. (Β© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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