Optical Properties of Mg, Fe, Co-Doped Near-Stoichiometric LiTaO3 Single Crystals

• Main Authors: Chung Wen Lan, Wei Tse Hsu, Zhi Bin Chen, Chien Cheng Wu, Ravi Kant Choubey
• Format: Article
• Language: English
• Published: MDPI AG 2012-01-01
• Series: Materials
• Subjects: LiTaO3 crystals; X-ray diffraction; single crystal growth; holographic properties
• Online Access: http://www.mdpi.com/1996-1944/5/2/227/

Mg, Fe co-doped near-stoichiometric lithium tantalite (SLT) single crystals were grown by employing the zone-leveling Czochralski (ZLCz) technique. The optical properties, holographic parameters, as well as the composition of the grown crystals were measured. It was found that the Li/Ta ratio decreased with the doping of Mg and Fe ions. A red shift was observed in absorption spectrum for the Mg, Fe co-doped crystals compared to the undoped and Mg-doped ones. The effect of the iron ions (Fe2+ and Fe3+) was further discussed based on the specified absorption bands. Moreover, the occupation mechanism for the defects was discussed by using the IR absorption spectrum, which was attributed to the FeTa3− defects in the highly Fe-doped crystal. In addition, the holographic parameters were also found to be improved with a higher Fe/Ta ratio in the crystals.