Patent ID: 8624204

Claim:
A system for serially irradiating a substrate by a plurality of radiation sources, said substrate comprising a base layer and I stacks on the base layer, said system comprising: J different electromagnetic sources of radiation, each source of said J sources characterized by a different function of wavelength and angular distribution of its emitted radiation, said J≧2; means for concurrently exposing the I stacks to radiation from only one source t(i) of the J sources in each exposure step i of I independent exposure steps such that either a first condition or a second condition is satisfied, wherein I≧2, and wherein P j denotes a same normally incident energy flux on each stack from source j such that P j is specific to source j for j=1, 2, . . . , J; wherein the first condition is that said only one source t(i) is selected from the J sources in exposure step i such that an actual energy flux V i transmitted into the substrate via stack i in exposure step i is maximal through deployment of said only one source t(i) as compared with deployment of any remaining source of the J sources for i=1, 2, . . . , and I, wherein an error E being a function of |V 1 −S 1 |, |V 2 −S 2 |, . . . , |V I −S I | is about minimized with respect to P i for i=1, 2, . . . , I, wherein S i denotes a specified target energy flux targeted to be transmitted via each stack i into the substrate such that S i is specific to each stack i for i=1, 2, . . . , I, wherein J≦I; and wherein the second condition is a specified design condition on the substrate pertaining to a device parameter of the substrate.