Patent ID: 7177031
Filing Date: 2007-02-13
Classification: G02B

Abstract:
1. A method of providing a grating array system comprising the step of aligning at least one grating of a plurality of gratings with respect to another providing effectively one large monolithic grating, with said plurality of gratings operative in a coherently additive mode to simultaneously satisfy the following equations wherein OPD is an optical path difference, Δx is a change in a movement in a lateral direction parallel to the plane of the gratings, L is a lateral shift between gratings, M is an integer, d is a grating pitch, λ is a wavelength of light, which is the average wavelength for polychromatic light, Δz is a change in a movement in the piston shift direction perpendicular to the plane of the gratings P is a piston shift between the gratings, N is any integer, and θ  wherein Δθ Δθ θ  wherein Δθ