Abstract
An infrared continuous zoom system is designed.The simple system has a large relative aperture with high transmittance,large continuous zoom ratio,and wide wave band.By introducing a diffractive surface and an aspheric surface,the modulation transfer function(MTF) of the system is above 0.6 for all continuous zoom ratios at the spatial frequency of 14lp/mm.As the system only contains 4 lenses,the transmittance is higher than 80%,and the zoom ratio of the system could also reach 8 continuously.As the color and the off-axis aberration are well corrected,the experiment indicates that the image quality of the continuous zoom system is pretty well.
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