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![]() CaF2 Plano-Concave Spherical LensesThorlabs' CaF2 plano-concave lenses diverge a collimated beam from a virtual focus and are commonly used in Galilean-type beam expanders. Plano-concave lenses have a negative focal length and negative spherical aberration, which can be used to balance out aberrations of other lenses in the system. | |||||||||||||||||
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