Germdiff.len - An infrared diffractive achromat

Germdiff.len - An infrared diffractive achromat

One of the first practical applications of diamond-turned computer-generated holograms was a single element achromat for the infrared. This lens, designed by Reidl and McCann, is discussed in detail in the Optics Reference manual. It combines a conventional aspheric on the front surface with a diffractive surface on the back of a Germanium singlet to achieve good performance at f/1. Note that the system, while achromatic, has secondary spectrum that cannot be corrected using this scheme.

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