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In designing an athermalized lens, the mounting details of the elements must be taken into account carefully. A common approach for optimization is to assume that the elements are separated by spacers whose CTEs are known. Unfortunately, in most cases this is not how the optical system is actually assembled. More commonly, the individual lenses are either cemented to or otherwise preloaded against seats cut into the housing barrel. Furthermore, there are many ways in which the contact between the optical elements and the housing takes place, and this influences the location where each element is “pinned” to the housing, i.e., the position at which there is no relative motion between the element and the housing.
In this paper, we present the design of a lens optimized to be optically athermalized over a 200° C temperature range. The design includes the effects of the lens mounting details as well as the change in CTE of aluminum over temperature. We also explore the sensitivity of the design to the mounting details and the CTE.
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