The layout of the primary optics
This new compressor layout has been implemented and completed in May 2022. The new layout is a streamlined design, simple, robust, and user-friendly. It has decoupled the time-tool beam. So with time tool overhaul and the new standard configurations, it has executed the PEMP goal successfully in 2022. The new compressor features are listed below:
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- Glass-induced chirp: The plot shown in Fig. 5 is the pulse duration as a function of G2 translation scan. The glass-induced chirp (M2, window, lenses, and waveplate) can be measured by comparing the scans with and without glass media (solid green and empty green) in the air. The lowest point shifting from 12.05 to 11.45 mm suggests that the glass-induced chirp is -0.6 mm in G2 translation.
- Vacuum-induced offset: when the chamber is pumped down, the shortest position can be offset due to the removal of air and the breadboard stretch. It turns out the air contribution (um scale) is much less than the breadboard stretch. We can find out the offset amount by comparing the scans in the air and in the vacuum (solid green and solid red). The lowest point shifting from 12.05 to 11.45 mm suggests that the offset is -0.6mm in G2 translation.
- In practice, if we obtain the shortest pulse at 11.45 mm G2 translation, the real shortest pulse should be at 11.45-0.65=10.95 (mm).
Figure 5.
- SSA measurement
- sweet figure
- SPIDER measurement
- sweet figure
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