The Length Effects of Materials

The choice of housing materials for athermalizing infrared optics can drastically change the length of the optic. This video uses a previously derived Figure of Merit (FOM) to estimate the length of a passively athermal housing based on housing material selection. A 40% reduction in length is realized by replacing Aluminum with ALLVAR Alloy 30 in the commonly used Aluminum-Delrin material pair.

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