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30 June 1995 Growth of tailored sillenite photorefractives for optical correlation
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Photorefractives, in general, are among the most promising materials solutions to real time optical correlation. Applications include military target recognition and civilian robotic vision. Crystals of sillenite structure photorefractives, Bi12XO20, where X equals Si, Ge, or Ti, have been grown by melt techniques and in the case of bismuth silicon oxide (BSO) and bismuth titanium oxide (BTO) by the hydrothermal method of high-temperature/high-pressure solution growth. The two growth methods are discussed and crystals grown by the two methods are compared in this paper. Optical absorption and TSC studies show that hydrothermal BSO is essentially free of the native antisite Bi defect which usually acts as a donor. These studies also show that the trap density is greatly reduced in hydrothermal material. Preliminary experiments show that hydrothermal BTO crystals have improved properties over melt grown samples. Al and P act as donors and acceptors respectively and can be used to compensate the native antisite bismuth defect. Initial spectroscopy studies show that they can be used to alter the valence state of transition element dopants. This result may aid in 'tailoring' these materials.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
John J. Larkin, Meckie T. Harris, and Joel J. Martin "Growth of tailored sillenite photorefractives for optical correlation", Proc. SPIE 2481, Photonic Device Engineering for Dual-Use Applications, (30 June 1995);


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