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Abstract
Change of optical absorption after etching was experimentally studied on Ca and Bi doped GdIG films. When argon sputter-etching was performed on as-grown films for a period of time, absorption decreased to the same level as when reduction treatment was performed in Fe(OH)2 solution. Measurement of lattice constant showed that it increased up to a certain value in both cases of sputter-etching and reducing treatment. Further sputter-etching resulted in the increase of loss, while lattice constant remained unchanged. Change of absorption can be explained by changes in valency of ferric ions, whereas change of lattice constant is mainly attributed to reduction of Pb4+ to Pb2+.
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