Athermalization design for infrared dual-band double-layer harmonic diffractive optical system.

In order to achieve the anaberration and athermalization of the infrared dual-band optical system, a new athermalization design based on the negative dispersion property is proposed. The system uses closed four-piece lens which made of combination of three materials to realize the double-band thermal dissipation differential design. The influence of temperature on optical parameters and design method is analyzed. Through a design example, the parameter performance index is discussed. The design results show that the optical modulation transfer function of the medium wave band (3–5 u m) is greater than 0.5, the long wave band (8–10 u m) is greater than 0.25 when the operating temperature is between −60℃ and 200℃, and the Nyquist frequency of the detector is 20lp/mm. The results not only meet the design requirements but also verify the feasibility of the proposed method through the optimization analysis of Zemax software. [ABSTRACT FROM AUTHOR]