Patent Number: 6,674,577

Title: Optical element and method for recovering the substrate

Abstract: In the production of optical elements, not only flat substrates but alsospherical or aspherical substrates are used. The costs of such a substratecan exceed the coating costs by a multiple. Particularly in developmentwork, cost savings may be achieved if a substrate can be used repeatedly.To recover a substrate, it is proposed to provide an interlayer betweenthe substrate and the functional layers, which comprises at least onelayer of chromium and one layer of scandium. By immersing the opticalelement into a hydrochloric acid solution, this interlayer is dissolved,so that the functional layer is also removed from the substrate and thesubstrate is ready for reuse.

Inventors: Slashchenko; Nikolay (Nizhny Novgorod, RU)


International Classification: G02B 1/10 (20060101); G02B 027/10 (); G21K 001/06 ()

Expiration Date: 01/02016