| http://www.w3.org/ns/prov#value | - he formation of a Bragg mirror according to the process mentioned above, [0041] formation of a layer of active material on the Bragg mirror by crystalline growth, to form a cavity, [0042] formation of a second mirror on the cavity. [0043] The active material may be made of pure crystalline silicon or it may contain an active element, for example such as erbium or neodymium impurities. [0044] The a
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