Patent ID: 7635656

Claim:
A method for configuring radiation sources to serially irradiate a substrate, said method comprising: specifying J different electromagnetic sources of radiation denoted as source 1 , source 2 , . . . , source J, wherein each source of the J sources is characterized by a different function of wavelength and angular distribution of its emitted radiation, said J≧2; specifying the substrate, said substrate comprising a base layer and I stacks on the base layer, said I≧2, 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 J ≦I; specifying a target energy flux S i 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; for serial exposure of the I stacks to radiation from the J sources such that the I stacks are concurrently exposed to only one source t(i) of the J sources in each exposure step i of I independent exposure steps, calculating t(i) and P t(j) 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, and wherein an error E being a function of |V 1 −S 1 |, |V 2 −S 2 |, . . . . , |V 1 −S 1 | is about minimized with respect to P i for i=1, 2, . . , I.