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

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Author(s): Wei Tse Hsu | Zhi Bin Chen | Chien Cheng Wu | Ravi Kant Choubey | Chung Wen Lan

Journal: Materials
ISSN 1996-1944

Volume: 5;
Issue: 2;
Start page: 227;
Date: 2012;
Original page

Keywords: LiTaO3 crystals | X-ray diffraction | single crystal growth | holographic properties

ABSTRACT
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.
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Tango Jona
Tangokurs Rapperswil-Jona