Patent ID: 7898656

Claim:
An apparatus comprising: at least one first spectral separating arrangement which is structured to receive at least one first electro-magnetic radiation and generate at least one second electro-magnetic radiation, wherein a first spectrum of the at least one second electro-magnetic radiation is dispersed along at least one first dispersive axis with respect to a propagation direction of the at least one second electro-magnetic radiation; at least one second arrangement which is configured to receive the at least one second electro-magnetic radiation and produce at least one third electromagnetic radiation having a second spectrum dispersed along at least one second dispersive axis with respect to a propagation direction of the at least one third electromagnetic radiation, wherein orientations of the respective first and second dispersive axes are different from one another; and at least one third spectral separating arrangement which is structured to receive at least one third electro-magnetic radiation and generate at least one fourth electro-magnetic radiation, wherein a third spectrum of the at least one fourth electro-magnetic radiation is dispersed along at least one third dispersive axis with respect to a propagation direction of the at least one fourth electro-magnetic radiation, wherein orientations of the respective second and third dispersive axes are different from one another, and wherein the orientations of the respective first and third dispersive axes are different from one another.