Optical system for producing uniform illumination

An optical system for producing uniform illumination on a target, comprising:

• a body;
• a recess formed on a bottom side of the body at a central region thereof accommodating a light source arranged in an integration zone, the recess having a side entry surface and a central entry surface;
• a total internal reflection surface provided at a side surface of the body, wherein the total internal reflection surface comprises a plurality of first lenslets, each of the first lenslets being radially adjacent to one or more others of the first lenslets and circumferentially adjacent to one or more others of the first lenslets;
• and
• an exit surface provided at a top side of the body, the exit surface comprising a plurality of second lenslets, each of the second lenslets being radially adjacent to one or more others of the second lenslets and circumferentially adjacent to one or more others of the second lenslets;
• wherein each of the first lenslets forms a pair with a respective one of the second lenslets, such that a distance separating each pair of lenslets is substantially equal to a focal length of both the first and second lenslet in that pair;
• wherein the light source provides light to the total internal reflection surface through the side entry surface;
• wherein the first lenslets of the pairs image the light source from the integration zone on the second lenslets of the pairs;
• and
• wherein the second lenslets of the pairs image the first lenslets of the pairs on the target,
• such that the optical system produces uniform illumination on the target.