This study presents a new method for selecting a pair of optical glass and housing material to achromatize and athermalize a lens system, by use of the factor of determination for material selection. To effectively obtain an optimum combination for materials, we newly propose the sequential material selection method by introducing the factor of determination for material selection, which depends on the level of contribution to correct these aberrations and the availability to be used as a suitable material. Even though there are many cases for material combinations, we can sequentially identify the best pair of glass and housing materials by checking the factor of determination. Using this design approach, we efficiently obtain an achromatic and athermal system through an optimum combination of materials, over the specified ranges in temperature and waveband.
This paper presents a new graphical method for selecting an optimum pair of optical glass and housing materials to simultaneously achromatize and athermalize a multilens system, by use of iterative method. To take into account the lens spacing and housing, we newly quantify the lens powers of the elements by weighting the ratio of the paraxial ray height at each element to them. In addition, we introduce the equivalent single lens and the expanded athermal glass map including a housing material. Even though there is no glass satisfying athermal and achromatic conditions, we can iteratively identify a pair of glass and housing materials by changing the power of equivalent lens.
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