Kaczmarek, M., Smith, P.G.R., Ross, G.W., Eason, R.W., Anderson, A.A., Brown, P. and Maatz, G.
Characterisation of periodically poled photoconductive materials and investigations of new photorefractive materials
Rutherford Appleton Lab Annual Report June 97.
Rutherford Appleton Laboratory
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Properties of Rh:BaTiO3 crystals processed in different conditions: In our investigations on novel, infrared-sensitive photorefractive materials we have concentrated on Rh:BaTiO3 to determine both the optimum dopant concentration, and post-growth processing conditions to improve its performance in the infrared. Rhodium doped BaTiO3 has interesting photorefractive properties. which enable us to observe high phase conjugate reflectivities and signal amplification both in the visible and the near-infrared. Firstly, we have studied the performance of Rh:BaTiO3 grown with 400 ppm of rhodium added to the melt. The crystals came from the same boule and were then post-processed separately in different conditions. One sample was left as-grown, the second was annealed in air at 1000°C. which effectively reduced the crystal, and the third sample was annealed in pure oxygen and then quenched to fix the oxygen concentration. Secondly, we have investigated crystals more heavily doped with rhodium: with 2400 ppm and 3200 ppm added to the melt.
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