The Design And Simulation Of Array-type Large Aperture Wedge Lens Fixed Axis Device

This topic comes from the horizontal topic of "terminal optical component reference copying and calibration platform engineering design".The development of fixed axis device is used for beam alignment of terminal optical component cluster components.A high-power laser nuclear fusion device being built in China is a large-scale engineering equipment for inertial confinement nuclear fusion experimental research,in which the terminal optical component realizes double-frequency conversion,harmonic separation of the incident laser and precise focusing to the target Perform beam steering.As the energy of the device is further increased,the number of beams is increasing.Due to the limited space of the shooting range and the complicated arrangement of the optical path,it is necessary to integrate multiple lasers.Our high-power laser nuclear fusion device terminal optical component bundling assembly uses an array of wedge lenses in an approximately 3×3 arrangement to focus the eight laser beams.However,due to the processing error of the wedge lens and the assembly error of the bundle assembly,the focus of the eight lasers does not completely coincide,which affects the final experimental results.Therefore,we need a set of beam sizing schemes for the eight lasers of the bundle assembly.The shaft device ensures that the focusing accuracy of the beam meets the experimental requirements.In this paper,according to the general engineering design method and the task requirements of the project,a complete set of wedge lens beam aligning scheme and fixed shaft device are completed.Firstly,two array-type wedge lens positioning schemes are proposed.The first one is based on the principle of geometric optics.It analyzes the influence of the pose error of the lens on the shape,position and intensity of the focus.Using MATLAB software to find the minimum value of the focal length from the focal plane is the ideal point for the beam alignment.The second is to use ZEMAX optical design software to simulate the focus of the lens pose error,and obtain the maximum energy point directly on the focused target surface,and verify the correctness of the geometric optical analysis results.Secondly,based on the beam aligning scheme,the whole structure design of the beam aligning device is completed.It specifically includes two parts,namely,a single lens aligning device and an array lens aligning device.The three-dimensional modeling of the whole machine model was carried out by SOLIDWORKS,and the working principle and actual working process of the device were analyzed and demonstrated.The auto-collimator motion adjustment platform and the standard mirror motionadjustment platform are designed in detail.At the same time,the control part of the array lens fixing device is designed,including the selection of components such as the core controller and the driving device,the formulation of the control strategy and the configuration of the software part of the control system.Finally,based on the finite element method,the ANSYS software is used to check the dynamic components of the auto-collimator motion adjustment platform and the standard mirror motion adjustment platform to verify the strength,stiffness and structural stability of each platform can meet the design requirements.