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Figure 11
Optical layout (left) of the high-transmission (T ≃ 0.2) ZPM beamline after the upgrade in 2012. In order to select a certain lens (image) and energy range, the optical element (RZP array, yellow) is moved perpendicular to the optical axis driven by a stepping motor. A special laser feed-in (orange) is an inherent part of the approach enabling pump–probe experiments with variable pump wavelength from UV to FIR at large numerical aperture. The red images above the right-hand picture show the intensity distributions in the focus after each lens (see Brzhezinskaya et al., 2013BB9). Spot size is ∼150 µm (H) × the vertical slit dimension, i.e. 20 or 40 µm.

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