Figure 6
Beam at the sample position using a 20 µm-thick Ce:YAG fluorescence screen. (a) Focused beam. (b) Vertically defocused beam showing weak stripes. The vertical beam profile is compared with a ray-tracing simulation (including the resolution of the imaging system). (c) Beam defocused in the horizontal and the vertical dimensions to 610 µm × 305 µm FWHM (H × V). |