OPTICAL ELEMENT, OPTICAL DEVICE, AND METHOD FOR MANUFACTURING OPTICAL ELEMENT

The invention discloses an optical element, an optical device and a method for manufacturing the optical element. An optical element includes a non-uniform structure including a plurality of protrusions on at least a portion of an optical surface, the plurality of protrusions including a first protrusion and a second protrusion disposed closer to a center of the optical surface than the first protrusion. The shape of the first convex portion viewed from a normal direction of the first convex portion has a length r1 in a first direction from a center of the optical surface toward an end portion of the optical surface and a length r2 in a second direction intersecting the first direction. The shape of the second convex portion viewed from the normal direction of the second convex portion has a length r3 in a third direction from the center of the optical surface toward the end portion of the optical surface and a length r4 in a fourth direction intersecting the third direction. The following relationships are s