Finite Element Analysis for Surface Shape Deformation of Photo-Electronic Theodolite Primary Mirror

Fanjiao, 谭凡教 Tan; Yan-feng, 乔彦峰 Qiao; Yaobin, 李耀彬 Li; Hui-bin, 高慧斌 Gao; Zhichun, 刘旨春 Liu

doi:10.3788/aos20082804.0756

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“…Integrated opto-mechanical analysis has been widely used to evaluate the optical aberration of a system with surface deformation caused by temperature change [1][2][3][4][5][6][7]. Few previous studies have paid attention to the performance reduction caused by the index gradient in the transmission system [8,9].…”

Section: Introductionmentioning

confidence: 99%

Research on a wavefront aberration calculation method for a laser energy gradient attenuator

et al. 2013

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When a laser energy gradient attenuator is working, there is an inhomogeneous temperature distribution in the whole of the glass because of the non-uniform light energy absorption. This will lead to optical performance reduction. An integrated opto-thermal–mechanical method is proposed to calculate the wavefront aberration for analysis of the thermal effect of the system. Non-sequential optical analysis is used for computing the absorbed energy distribution. The finite element analysis program solves the temperature distribution and the deformations of nodes on the surfaces. An interface routine is created to fit the surface shape and the index field, and extended Zernike polynomials are introduced to get a higher fitting precision. Finally, the parameters are imported to the CodeV optical design program automatically, and the user defined gradient index material is ray traced to obtain the wavefront aberration. The method can also be used in other optical systems for thermal effect analysis.

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