Youden, K.E., James, S.W., Eason, R.W., Chandler, P.J., Zhang, L. and Townsend, P.D.
Photorefractive planar waveguides in BaTiO3 fabricated by ion-beam implantation.
Optics Letters, 17, (21), . (doi:10.1364/OL.17.001509).
For the first time to our knowledge, photorefractive properties have been observed in planar waveguides fabricated by the technique of ion-beam implantation in BaTiO3 single crystals. The implantation was carried out by using 1.5-MeV H+ ions at a dose of 10^-16 ions/cm^2. For a given input power, a decrease in the effective photo-refractive two-beam coupling response time of >10^2 has been observed, owing to a combination of optical confinement within the waveguide and possible modification of charge-transport properties induced through implantation. Experiments carried out on the two-beam coupling gain show that the gain direction has been reversed in the waveguide compared with that of the bulk crystal.
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