Patent ID: 8430514
Filing Date: 2013-04-30
Classification: B82Y,G02B,G03F,G21K

Abstract:
1. A method for producing a reflective optical element for an operating wavelength in the soft X-ray and extreme ultraviolet wavelength range, comprising: arranging a first multilayer system composed of at least two alternating materials having different real parts of the refractive index at the operating wavelength on a substrate, the first multilayer system exerting a layer stress on the substrate, arranging a second multilayer system composed of at least two alternating materials having different real parts of the refractive index at the operating wavelength on a substrate, the second multilayer system exerting an opposite layer stress on the substrate, between the first multilayer system and the substrate, and depositing the second multilayer system by: (a) using layer-forming particles that have an energy of at least 90 eV, or (b) magnetron sputtering or ion-beam assisted sputtering using layer-forming particles that have an energy of at least 40 eV, or (c) pulsed laser coating using layer-forming particles that have an energy of at least 40 eV.