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Materials 2012, 5(2), 227-238; doi:10.3390/ma5020227
Article

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

1
,
1
,
1
,
1,2
 and
1,*
1 Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan 2 Department of Applied Physics, Birla Institute of Technology, Mesra, Ranchi 835-215, India
* Author to whom correspondence should be addressed.
Received: 17 November 2011 / Revised: 17 January 2012 / Accepted: 19 January 2012 / Published: 30 January 2012
(This article belongs to the Special Issue Advanced Materials for Modern Holographic Applications)
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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.
Keywords: LiTaO3 crystals; X-ray diffraction; single crystal growth; holographic properties LiTaO3 crystals; X-ray diffraction; single crystal growth; holographic properties
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Hsu, W.T.; Chen, Z.B.; Wu, C.C.; Choubey, R.K.; Lan, C.W. Optical Properties of Mg, Fe, Co-Doped Near-Stoichiometric LiTaO3 Single Crystals. Materials 2012, 5, 227-238.

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