When the diffractive optical lens is illuminated by white light, its focal length not only relates to material dispersion and wavelength dispersion, but also to aperture factor.
在白光照射下，衍射光学透镜的焦距不仅同材料色散和波长色散有关，而且还同孔径因子有关。
Selenide glasses have low material dispersion, high-energy bandgap, long-wavelength multiphonon edge and it's the perfect candidate for mid-far-infrared fibers.
硒化物玻璃具有低的材料色散、高的禁带宽度、长的多声子吸收边，是制备中远红外光纤的优秀材料。
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