Figure 4
Images of the FEL beams coming from the branch-line 1 (a) and 2 (b) on a fluorescent screen. Cross-correlations measurements corresponding to the beam from branch-line 1 (c) and 2 (d). (e) and (f) are as (c) and (d), respectively, after the equalization of the relative time delay between the two FEL beams. (g) AFM topography of the permanent grating generated by the interference between the two FEL beams where the printed grating can be clearly seen. (h) CCD image of the UV laser beam diffracted by a FEL-generated grating. |