| http://www.w3.org/ns/prov#value | - The photo-reactive medium 652 is preferably of sufficient mechanical strength to maintain a polished surface suitable for coating with a partially reflective material, such as silver, gold or platinum, or a dielectric coating. [0084] After passing through the first partially reflective surface 640, the signal 612 traverses the photo-reactive medium 652 of optical cavity 650, and reflects off the s
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