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Study of an athermal infrared dual band optical system design containing harmonic diffractive element

机译：含谐波衍射元件的无热红外双波段光学系统设计研究

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A harmonic diffractive element (HDE) is first successfully introduced to the athermal system of infrared dual band in this paper. In this system, there are only three lens and two materials, silicon and germanium. When the temperature ranges from -70℃ to 100℃ in the dual band, it can simultaneously accomplish the rectification of the longitudinal aberration in the big field of view, as well as the wave front aberration less than 1/4 wavelength. Modulation transfer function of dual band approaches or attains the diffraction limit. The calculation results show that the spectral properties of the HDE are between refractive and diffractive elements, so we can design a simple dual-band and athermal optical system by selecting the thickness and central wavelength of the HDE exactly. Compared with a conventional refractive optical system, this system not only reduces the demand for high technical levels, but also has a compact structure, few elements, a high transmittance better aberrations performances and athermal character. At the same time, the use of the HDE also offers a new element for the infrared optics design.
机译：本文首先将谐波衍射元件（HDE）成功引入了红外双波段无热系统。在该系统中，只有三个透镜和两种材料，硅和锗。当双波段温度在-70℃至100℃范围内时，可以同时完成大视场内纵向像差以及小于1/4波长的波前像差的校正。双频带的调制传递函数接近或达到衍射极限。计算结果表明，HDE的光谱特性介于折射和衍射元件之间，因此我们可以通过精确选择HDE的厚度和中心波长来设计一个简单的双波段和无热光学系统。与传统的折射光学系统相比，该系统不仅减少了对高技术水平的需求，而且具有结构紧凑，元件少，高透射率，更好的像差性能和无热特性。同时，HDE的使用也为红外光学设计提供了新元素。

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