| http://www.w3.org/ns/prov#value | - An aspect of the present invention is to provide an ???induced??? oxidation process which can be implemented in a simple and cost-effective manner and with which the crystals, in particular lithium niobate and lithium tantalate, can be purified to an extent which has not been achieved to date in such a way that the absorption even of intense radiation in the crystal is reduced to a minimum.
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