Analysis of achromatic lens achromatic lens is a kind of lens composed of two optical components: positive low refractive index (crown plate) and negative high refractive index (Flint). Compared with the single lens containing only single glass, the double combination design of double lens can provide users with additional design freedom and further optimize the lens performance. Therefore, the advantages of achromatic lens are more significant than that of monolithic lens with equal diameter and focal length.
Achromatic lens has various types of configurations, among which positive achromatic lens, negative achromatic lens, triple achromatic lens and aspheric achromatic lens are common. It should be noted that the achromatic lens can be double (double element) or triple (three element), and the number of elements is independent of the number of light corrected by the lens. In other words, the achromatic lens in double or triple configuration can correct red and blue light in the visible light range. Refer to figures 1 to 4 for various types of achromatic lenses.