FIG. 5.

(Color online) Field reconstruction errors (top) for the focused source (100 mm aperture) as a function of the axial position $z_{\mathrm{h}}$ of the measurement region. Solid lines correspond to a measurement region with aperture $2a_{\mathrm{h}}=50$ mm; dashed lines correspond to a region with aperture $2a_{\mathrm{h}}=150$ mm. Bottom images illustrate source holograms reconstructed using the smaller measurement aperture at the indicated axial measurement positions.