Abstract:
A transmitting optical element of polycrystalline material that includes crystallites of magnesium spinel MgAl2O4 or lutetium-aluminum garnet Lu3Al5O12, wherein the polycrystalline material includes an average total concentration of foreign element contamination caused by Y, Sc, Co, Ni, Zr, Mo, Sn and/or Nb of less than 50 ppm, preferably of less than 20 ppm, and more preferably of less than 15 ppm.
Abstract translation:一种多晶材料的发射光学元件,其包括镁尖晶石MgAl 2 O 4或镥 - 铝石榴石Lu 3 Al 5 O 12的微晶,其中多晶材料包括由Y,Sc,Co,Ni,Zr,Mo,Sn引起的异物污染物的平均总浓度, /或Nb小于50ppm,优选小于20ppm,更优选小于15ppm。
Abstract:
A mirror (1a; 1a′; 1b; 1b′; 1c; 1c′) for the EUV wavelength range and having a substrate (S) and a layer arrangement, wherein the layer arrangement includes at least one surface layer system (P′″) consisting of a periodic sequence of at least two periods (P3) of individual layers, wherein the periods (P3) include two individual layers composed of different materials for a high refractive index layer (H′″) and a low refractive index layer (L′″), wherein the layer arrangement includes at least one surface protecting layer (SPL, Lp) or at least one surface protecting layer system (SPLS) having a thickness of greater than 20 nm, and preferably greater than 50 nm.
Abstract:
A method for the production of a mirror element (10) that has a reflective coating (10a) for the EUV wavelength range and a substrate (10b). The substrate (10b) is pre-compacted by hot isostatic pressing, and the reflective coating (10a) is applied to the pre-compacted substrate (10b). In the method, either the pre-compacting of the substrate (10b) is performed until a saturation value of the compaction of the substrate (10b) by long-term EUV irradiation is reached, or, for further compaction, the pre-compacted substrate (10b) is irradiated, preferably homogeneously, with ions (16) and/or with electrons in a surface region (15) in which the coating (10a) has been or will be applied. A mirror element (10) for the EUV wavelength range associated with the method has a substrate (10b) pre-compacted by hot isostatic pressing. Such a mirror element (10) is suitable to be provided in an EUV projection exposure system.
Abstract:
Mirrors having a reflecting coating for the EUV wavelength region and a substrate. A surface region of the substrate extends uniformly below the reflecting coating along this coating and, seen from the surface of the substrate, has a depth of down to 5 μm. Here, this surface region has a 2% higher density than the remaining substrate. Also disclosed are substrates that likewise have such surface regions and methods for producing such mirrors and substrates having such surface regions by irradiation using ions or electrons.