White light dimmer for fiber optic illumination sources

A white light dimmer for an illuminated optical fiber wherein an aperture of a source of converging white light for the illumination of the fiber remains the same while the intensity of the light produced by the optical fiber is dimmed comprising:

• a cover having a first flat surface terminating in at least one thin edge, a second non-flat surface terminating in the at least one thin edge, and a varying thickness of material between the first and second surfaces;
• wherein the first flat surface of the cover touches and gradually partially covers a receiving end of the illuminated optical fiber, and wherein the angle formed by the intersection of the first surface and the second surface at the thin edge is less than the critical entrance angle of the source light to illuminate the optical fiber;
• and
• said at least one thin edge having a thickness less than about 0.01" and having a length greater than the diameter of the optical fiber.