Degussa Novara Technology: SiVARA process technology, production, of silica glass, solgel method, NTECH, ntech, silica, glass, quartz, sol, gel, aerogel, fibre, preform, optical, cladding, crucible, photomasks, microoptics, lens, array, grating, optoelectronics, net, shape, optical, component, nanoporous, material, novara, technology, synthetic, quartz, jacket, planar, optics