Sensitivity analysis of the CTE and thermo-optical coefficients of a passively athermalized lens

Martin Tangari Larrategui; Victor E. Densmore III; Lee Johnson; Christopher Giokaris; Kate Medicus; Kenneth R. Castle; Tilman W. Stuhlinger

doi:10.1117/12.2569759

20 August 2020 Sensitivity analysis of the CTE and thermo-optical coefficients of a passively athermalized lens

Martin Tangari Larrategui, Victor E. Densmore III, Lee Johnson, Christopher Giokaris, Kate Medicus, Kenneth R. Castle, Tilman W. Stuhlinger

Author Affiliations +

Proceedings Volume 11488, Optical System Alignment, Tolerancing, and Verification XIII; 1148809 (2020) https://doi.org/10.1117/12.2569759
Event: SPIE Optical Engineering + Applications, 2020, Online Only

Abstract

Optical systems are often athermalized over large temperature ranges through the proper choice of glasses and mounting materials. However, variations in the coefficients of thermal expansion (CTE) and thermo-optical coefficients that govern thermal behavior are seldom included in the tolerance analysis. Manufacturers rarely provide these material tolerances and we can only account for their effects through custom macros in lens design software. We demonstrate that a first-order sensitivity analysis on the change in focus position at each environmental condition accurately predicts the degradation of the system performance. We verified this correlation by creating a custom catalog of identical glasses with perturbed thermal parameters and evaluating the RMS wavefront error for each material substitution.

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Martin Tangari Larrategui, Victor E. Densmore III, Lee Johnson, Christopher Giokaris, Kate Medicus, Kenneth R. Castle, and Tilman W. Stuhlinger "Sensitivity analysis of the CTE and thermo-optical coefficients of a passively athermalized lens", Proc. SPIE 11488, Optical System Alignment, Tolerancing, and Verification XIII, 1148809 (20 August 2020); https://doi.org/10.1117/12.2569759

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