Fig. 2
From: A renewable double plasma mirror for Petawatt-class lasers
Total reflectivity vs focal location downstream from PM 1, shown in (a), measured (black) and calculated using the model described in the text (blue). The dashed blue line indicates a focus directly on PM 2. The red circle indicates the focal location used to optimize the spatial mode and stability and for measurement of the temporal contrast enhancement. The measured Near Field reflected off the DPM (b) is similar to the Reference beam (c).
