A device for adjusting a position of an optical component in two directions, comprising: - a first member having a flat sliding surface, - a second member arranged to be movable relative to the first member in contact with said sliding surface, to which second member the optical component is attachable, and - an elongated third member arranged in an operational connection with the first and the second member so that the second member is movable relative to the first member in a direction of a rotation axis of the third member when the third member is being moved in the direction of its rotation axis, said rotation axis being substantially parallel to the sliding surface of the first member, wherein the first member comprises an aperture through which the third member is movable and the third member comprises an eccentric part which is eccentric in relation to the rotation axis of the third member, the eccentric part being arranged in an operational connection with the second member so that the second member is movable relative to the first member in a direction perpendicular to said rotation axis when the third member is being rotated around its rotation axis, characterised in that the third member comprises a helical thread formed along a portion of the third member and that the aperture comprises a corresponding helical groove so that the third member is movable through the aperture along its rotation axis by rotating the third member around its rotation axis and in that the eccentric part of the third member is received in its operational connection to the second member in a corresponding groove of the second member into which it is movable such that a rotation of the third member around its rotation axis moves the third and the second member forward along the direction of the rotation axis via the coupling to the eccentric part and at the same time translates the rotation of the third member via the eccentric part of the third member coupled to the second member into a linear movement of the second member into a direction perpendicular to the rotation axis of the third member such that an overall oscillating translation of the second member in the plane of the flat sliding surface of the first member results. - a first member having a flat sliding surface, - a second member arranged to be movable relative to the first member in contact with said sliding surface, to which second member the optical component is attachable, and - an elongated third member arranged in an operational connection with the first and the second member so that the second member is movable relative to the first member in a direction of a rotation axis of the third member when the third member is being moved in the direction of its rotation axis, said rotation axis being substantially parallel to the sliding surface of the first member, wherein the first member comprises an aperture through which the third member is movable and the third member comprises an eccentric part which is eccentric in relation to the rotation axis of the third member, the eccentric part being arranged in an operational connection with the second member so that the second member is movable relative to the first member in a direction perpendicular to said rotation axis when the third member is being rotated around its rotation axis, characterised in that the third member comprises a helical thread formed along a portion of the third member and that the aperture comprises a corresponding helical groove so that the third member is movable through the aperture along its rotation axis by rotating the third member around its rotation axis and in that the eccentric part of the third member is received in its operational connection to the second member in a corresponding groove of the second member into which it is movable such that a rotation of the third member around its rotation axis moves the third and the second member forward along the direction of the rotation axis via the coupling to the eccentric part and at the same time translates the rotation of the third member via the eccentric part of the third member coupled to the second member into a linear movement of the second member into a direction perpendicular to the rotation axis of the third member such that an overall oscillating translation of the second member in the plane of the flat sliding surface of the first member results.