Fabrication of a curved linear grating by using a laser direct writer system

We present the lithography technique to fabricate a curved linear grating by using a Cartesian coordinates laser direct writer (LDW) system. The grating with the period of 15 μm is made on the convex lens surface. This is a new application of the LDW system. After the chromium coating and the photoresist removing procedures, a convex reflecting grating is obtained.