Research on the deformation control of thin-walled part based on gas suspension

KDP crystal is one of the most important parts in high-powered laser facilities, and the deformation control of KDP crystal has an important impact on the final laser frequency doubling efficiency. This paper proposes an assembly method based on small-hole gas suspending plate compressed gas-assisted support to accurately control the deformation of KDP crystals. First, the flow equation of gas flow through the small hole is derived, and the influencing factors of the bearing capacity of the overall gas flotation plate are further deduced. Secondly, the finite element model of the fluid-structure coupling is established to calculate the stress and deformation of the KDP crystal. Finally, the assembly process of the gas-suspending plate is optimized and the deformation control effect is verified based on the laser damage threshold experiment. The results show that the Pv value of the KDP crystal can be controlled at 11.17 nm by rationally designing the structural parameters of the small-hole gas-floating plate. The gas suspension into the frame is a reliable way to assemble KDP crystal.