The layout of the primary optics

This new compressor overhaul, the 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 were included in the 2022 , it has executed the PEMP goal effort. The goal of the compressor overhaul project is to improve the performance and operability of the short pulse compressor. The successfully in 2022. The new compressor features are listed below:

• Remote controls of grating angle: in the new system, we installed two new rotation motors (URS75BPPV6) for both gratings (Fig1: G1 & G2) were installed to replace the manual controlled rotation stage. We also use the encoded LTA to replace the original The translation stage on G2 which was not encodedwas also replaced by LTA, which is encoded and remote-controlled. With all remote-control capabilities, we will implement an in-situ autocorrelator for an auto-optimization procedure (Fig.2), which can be operated with python script.
• Beam path: 
• Input/output pointing control: in the new system, we have two cameras looking at two input reference points. We have two mirrors prior to the compressor chamber for adjustment. We also have two cameras (Fig. 2 near field and far field) looking at compressor output. We have three motorized output mirrors (M1, M2, and M3)for adjustment.
• Compact mounts: in the new system, we use the 5” in-house designed mirror mounts to replace the 6” ones with lots of disadvantages. We also use compact TRA6 motors to replace LTA motors (cumbersome as pointing motors).
• Decouple time-tool: in the old system, the time tool beam was leaking through the compressed beam. It created complexity for both alignment and operation. In the new system, time-tool beam is decoupled from this line.
• Upgrading the grating mounts: the grating mounts are redesigned with better stability and compactness.

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Figure 1. the new layout design: the beam impinge upon the first diffraction grating immediately after entering the vacuum window, from which the beam pointing can be monitored. There are three motorized mirrors M1, M2, and M3 after the fourth bounce of the grating pair G1 and G2 to provide full pointing control prior to propagating into the target chamber.

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