Patent ID: 8804244
Filing Date: 2014-08-12
Classification: G02B,Y10T

Abstract:
1. A method for manufacturing a diffraction grating, the method comprising: providing a substrate having a first surface and a second surface opposite to the first surface; providing a first predetermined function associated with arrangement of grooves of the first grating and a second predetermined function associated with arrangement of grooves of the second grating, wherein the first predetermined function is and the second predetermined function is where θ is a half of an angle of two coherent beams used to manufacture the first and second grating, d1 is a period of the first grating, d2 is a period of the second grating, x1 is a longitudinal coordinate which has an origin at the center of the first grating, and x2 is another longitudinal coordinate which has another origin at the center of the second grating; transforming the first function into a first Fourier series and the second function into a second Fourier series; forming the first grating on the first surface of the substrate using a fast tool servo system according to the first Fourier series; forming the second grating on the second surface using the fast tool servo system according to the second Fourier series.