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Figure 10
Optical layout of the plane-grating monochromator (PGM) at the FemtoSpeX facility after the beamline upgrade in 2010. It consists of five optical elements (mirrors M1–M4 and grating G) that limit the transmission to T = 0.01, an order of magnitude less than at the ZPM at the same bandwidth. Spot size is 85 µm × 15 µm (H × V) and depends vertically on the exit slit dimension.

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