A method of manufacturing an optical assembly, the method comprising - forming a first optical component by rotating a first workpiece around a rotational axis while shaping its material to form a first optical surface having a first curvature which is rotation symmetric around a first optical axis of the first optical surface coinciding with the rotational axis, and a first alignment structure having a predefined first relative position (Dr1,Dz1) with respect to the first curvature of the first optical surface; - forming a second optical component by rotating a second workpiece around the rotational axis while shaping its material to form a second optical surface having a second curvature which is rotation symmetric around a second optical axis of the second optical surface coinciding with the rotational axis, and a second alignment structure having a predefined second relative position (Dr2,Dz2) with respect to the second curvature of the second optical surface; and - combining the first optical component with the second optical component by connecting the first alignment structure with the second alignment structure, wherein the first optical surface is aligned with respect to the second optical surface by the connection between the alignment structures (12,22) and their predefined relative positions (Dr1,Dz1;Dr2,Dz2) with respect to the optical surfaces (11,21), wherein the first curvature (C 1) defines a first focal point of the first optical surface, wherein the second curvature defines a second focal point of the second optical surface, characterized in that the first focal point is aligned to coincide with the second focal point. - forming a first optical component by rotating a first workpiece around a rotational axis while shaping its material to form a first optical surface having a first curvature which is rotation symmetric around a first optical axis of the first optical surface coinciding with the rotational axis, and a first alignment structure having a predefined first relative position (Dr1,Dz1) with respect to the first curvature of the first optical surface; a first optical surface having a first curvature which is rotation symmetric around a first optical axis of the first optical surface coinciding with the rotational axis, and a first alignment structure having a predefined first relative position (Dr1,Dz1) with respect to the first curvature of the first optical surface; - forming a second optical component by rotating a second workpiece around the rotational axis while shaping its material to form a second optical surface having a second curvature which is rotation symmetric around a second optical axis of the second optical surface coinciding with the rotational axis, and a second alignment structure having a predefined second relative position (Dr2,Dz2) with respect to the second curvature of the second optical surface; and a second optical surface having a second curvature which is rotation symmetric around a second optical axis of the second optical surface coinciding with the rotational axis, and a second alignment structure having a predefined second relative position (Dr2,Dz2) with respect to the second curvature of the second optical surface; and - combining the first optical component with the second optical component by connecting the first alignment structure with the second alignment structure, wherein the first optical surface is aligned with respect to the second optical surface by the connection between the alignment structures (12,22) and their predefined relative positions (Dr1,Dz1;Dr2,Dz2) with respect to the optical surfaces (11,21), wherein the first curvature (C 1) defines a first focal point of the first optical surface, wherein the second curvature defines a second focal point of the second optical surface, characterized in that the first focal point is aligned to coincide with the second focal point.