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23 August 2017 Using a two-lens afocal compensator for thermal defocus correction of catadioptric system
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The work associates with the catadioptric systems with two-component afocal achromatic compensator. The most catadioptric systems with afocal compensator have the power mirror part and the correctional lens part. The correctional lens part can be in parallel, in convergent beam or in both. One of the problems of such systems design is the thermal defocus by reason of the thermal aberration and the housing thermal expansion. We introduce the technique of thermal defocus compensation by choosing the optical material of the afocal compensator components. The components should be made from the optical materials with thermo-optical characteristics so after temperature changing the compensator should become non-afocal with the optical power enough to compensate the image plane thermal shift. Abbe numbers of the components should also have certain values for correction chromatic aberrations that reduces essentially the applicable optical materials quantity. The catalogues of the most vendors of optical materials in visible spectral range are studied for the purpose of finding the suitable couples for the technique. As a result, the advantages and possibilities of the plastic materials application in combination with optical glasses are shown. The examples of the optical design are given.
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S. E. Ivanov, G. E. Romanova, and A. V. Bakholdin "Using a two-lens afocal compensator for thermal defocus correction of catadioptric system", Proc. SPIE 10375, Current Developments in Lens Design and Optical Engineering XVIII, 1037512 (23 August 2017);

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