Abstract
Chromatic confocal imaging systems 1–3 are based on the well-known principle of confocal microscopy. 4 They use a polychromatic light source instead of a laser, and the focal length has strong wavelength dependence so that different wavelengths are focused at different axial distances. The wavelength dependence is achieved by replacing the standard objective lens with a hyperchromatic lens. 5, 6 Hyperchromatic systems are characterized by an optimized longitudinal chromatic aberration adapted to the specific application requirements. 7, 8
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