| http://www.w3.org/ns/prov#value | - tion in the at least one optically absorbing area, wherein M is an integer between 1 and K???1; and at least one further means for diffraction, for coupling at least part of the at least one diffracted optical beam out of the at least one substrate by diffraction in the at least one further means for diffraction, thus providing an output optical beam out of the at least one substrate with an expan
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