Dependence of the influence function on laser-induced thermoelastic deformation of deformable mirrors

Binbin Wei; Wenguang Liu; Kun Xie; Zongfu Jiang; Qiong Zhou

doi:10.1117/12.2071249

3 February 2015 Dependence of the influence function on laser-induced thermoelastic deformation of deformable mirrors

Binbin Wei, Wenguang Liu, Kun Xie, Zongfu Jiang, Qiong Zhou

Proceedings Volume 9255, XX International Symposium on High-Power Laser Systems and Applications 2014; 925535 (2015) https://doi.org/10.1117/12.2071249
Event: XX International Symposium on High Power Laser Systems and Applications, 2014, Chengdu, China

Abstract

Influence function is one of the most important parameters for the correction of aberrations with deformable mirrors. When deformable mirrors are loaded with laser irradiation, the influence function will be affected by the heat-induced thermoelastic deformation, which would lower the aberration correction ability and effectiveness. On occasions when they are applied in laser systems, the influence of laser-induced thermoelastic deformation is significant, it would cause a considerable change in the influence function. We have analyzed the changes in the surface shape of a 37-element deformable mirror caused by laser induced thermoelastic deformation, and calculated the changes of influence function. The dependence of influence function on the arrangement of actuators, material properties of the actuators and the base and the heat flux is analyzed, with the actuator layout being square and hexagonal, different material properties and the heat flux varied from 0.005W/mm² to 0.01W/mm², using the finite element method. The results indicate that all of the previous factors will affect the influence function. Thus, in order to reduce the change of influence function caused by laser induced surface shape, the material and parameters of the deformable mirror should be chosen carefully.

Citation Download Citation

Binbin Wei, Wenguang Liu, Kun Xie, Zongfu Jiang, and Qiong Zhou "Dependence of the influence function on laser-induced thermoelastic deformation of deformable mirrors", Proc. SPIE 9255, XX International Symposium on High-Power Laser Systems and Applications 2014, 925535 (3 February 2015); https://doi.org/10.1117/12.2071249

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