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11 October 2012 Design of large aperture four group elements mid-wave infrared zoom lens
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Zoom lens with variable focal length is well fit for researching objectives far and near. Design of zoom lens working at mid-wave infrared wavelength (7.7-10.3_m) and its view field 10 degrees is presented. Determination of the initial configuration of the variable and the compensate groups are discussed according to the mechanism compensate curves. The compensate group is determined with positive power. Its focal length changes during a large scope, which is from 300mm to 100mm. And the corresponding F number variables from 3.75 to 1.25. So the residual aberration needs to be carefully corrected. The optimized zoom lens is composed of four group elements, and its performance reaches diffraction limited at each focal position.
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Yiqun Ji, Rongbao Shi, Hucheng He, and Weimin Shen "Design of large aperture four group elements mid-wave infrared zoom lens", Proc. SPIE 8486, Current Developments in Lens Design and Optical Engineering XIII, 84861A (11 October 2012);

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