Patent ID: 7239787

Claim:
A device for transformation of an optical radiation beam, said device comprising: end faces including an input end face and an output end face, and a multitude of channels extending between said end faces for providing passage of optical radiation, said channels including reflecting walls and individual longitudinal axes, the channels being evacuated or filled up with air or other gaseous medium, said optical radiation passing through said channels with or without reflection from said walls and exiting from said end faces, each said channel including an inlet opening and an outlet opening coincident with said end faces, continuations of said channels beyond the input and output end faces having shape in aggregate of an input optical radiation beam received by the device and a required output optical radiation beam, and at least the input end face of said end faces but not said inlet opening or outlet opening of said channels having a coating of a material non-transparent for the optical radiation in an optical range being used, in order to prevent the optical radiation from being transmitted from the inlet to the output of said device through a medium formed by gaps between said channels.