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| Values updated following 2023 100 J upgrade |
The shaping is effective for pre-compensation of gain profile non-uniformities to achieve a flat output profile. To properly shape the beam profile for high-energy amplification, we use the apodization method, which involves a serrated aperture and a vacuum spatial filter. As Figure 3 shows, a serrated aperture is mounted on an x, y stage to position in the beam centroid. A 4-f relay system images the beam from the serrated aperture plane (position a) to the plane of the 25 mm amplifier (position c). A mode camera is set up to image the amplifier plane to study the beam shape with respect to the change of aperture or pinhole size.
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