| http://www.w3.org/ns/prov#value | - The various optical media 220, 222, 224 may comprise any suitable materials, including crystal, glass, solution, semiconductor material, nonlinear optical material, liquid materials such as liquid crystal and other liquid organic and inorganic material, plastic materials such as polymers or other organic material, gaseous materials, and other organic and inorganic material and/or compounds.
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