Passive athermalization and achromatization of a two-component system with air gap.

Passive athermalization allows keeping spatial resolution through the given spectral range while working within a wide temperature range without refocusing. Existing works concerning the problem of passive athermalization usually analyze two-lens components with zero thickness and air gaps. In our work, we have included an air gap into the consideration and derived general expressions for an athermal achromatic case. We have shown that including the air gap into the analysis led to the expanded area of solutions and can be considered as basic for more complex schemes. The method suggested provides the basis for designing athermal systems for various optic electronic devices.