Passively Athermal Doublet

As discussed under color correction one can use two components to complement each other and solve four a pair of imaging components to have a common focus at two wavelengths (an acrhomat). Notice how I use the term "component" not material. This is done because a diffractive isn't a "material" dependent imaging component. It is truly a component.

In a similar way, one can use two imaging components to minimize thermal defocus.

Under construction:
insert power for a thermal crown and thermal flint
Subpages (1): Thermal editorial
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