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Considerations in Collimation

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Considerations in Collimation

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A collimated beam of light is defined when every ray within the beam is parallel to every other ray. To produce collimated light you can either place an infinitesimally small source exactly one focal length away from an optical system with a positive focal length or you can observe the point source from infinitely far away. In the real world, neither of these scenarios are possible. To achieve ideal collimation, the size of the illumination source must be minimized or the focal length of the collimating system must be increased.

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