摘要:
A projection lens of an EUV-lithographic projection exposure system with at least two reflective optical elements each comprising a body and a reflective surface for projecting an object field on a reticle onto an image field on a substrate if the projection lens is exposed with an exposure power of EUV light, wherein the bodies of at least two reflective optical elements comprise a material with a temperature dependent coefficient of thermal expansion which is zero at respective zero cross temperatures, and wherein the absolute value of the difference between the zero cross temperatures is more than 6K.
摘要:
In EUV lithography apparatus (10), it is proposed, in order to lengthen the lifetime of contamination- sensitive components, to arrange them in a protection module. The protection module comprises a housing (23-29) having at least one opening (37-47), in which at least one component (13a, 13b, 15, 16, 18, 19) is arranged and at which one or more gas feeds (30-36) are provided in order to introduce a gas flow into the housing (23-29), which emerges through the at least one opening (37-47). In order to effectively prevent contaminating substances from penetrating into the protection module, a light source (48-56) is arranged at the at least one opening (37-47), which light source illuminates the opening (37-47) with one or more wavelengths by which the contaminating substances can be dissociated before they penetrate through the opening (37-47).
摘要:
A method for producing a mirror (124) for a lithography apparatus (100) is disclosed, comprising the following steps. In a first step a), a likely heat flux distribution (518) on the mirror (124) is determined. In a second step b), a number of heating zones (HZ1 - HZ13) are formed on the mirror (124) in dependence on the determined heat flux distribution (518). In a third step c), a respective heating zone (HZ1 - HZ13) is provided with a respective heating device (HE1 - HE13) for heating the respective heating zone (HZ1 - HZ13) in dependence on a recorded temperature of the respective heating zone (HZ1 - HZ13) or the likely heat flux distribution (518) on the mirror (124).