You need to increase the distance that a KrF laser at 0.248 µmwith a beam radius of 0.322 mm can reach. To do so you need todesign a beam expander to enlarge the beam radius to 2.806 mm. Youare given second lens f2= 71.4cm. Do both Galilean and Keplerianexpander and draw the design. State what f input lens is requiredand the length of the system. Make a diagram for each system. (b) What is the Rayleigh range before and after the beam isexpanded . (c) What is the spot size at a distance of139.8 m for both the original and expanded beam? Distances are fromthe laser for the original and from the beam expander output secondcase.
