A laser processing device (125, 225, 308, 408) comprising: an optical arrangement (100, 200, 300, 400, 500); at least one movable mirror and an actuator arrangement for controlling the at least one movable mirror; wherein the optical arrangement (100, 200, 300, 400, 500) comprises an input for receiving a laser beam; wherein the at least one movable mirror is arranged to change a state of the laser beam at the input; and wherein the optical arrangement (100, 200, 300, 400, 500) comprises a beam splitter which splits the laser beam into at least two partial beams (104, 204); and wherein the optical arrangement (100, 200, 300, 400, 500) recombines the partial beams (104, 204) into a laser spot for generating an interference pattern (108, 208) in the laser spot; wherein a change of an angle of incidence of the laser beam with respect to the input and optionally additionally a change of a position of the laser beam at the input causes at least one of the following: (i) a distance change DP of a distance (141, 241) between a center of the laser spot and an interference maximum of the interference pattern (108, 208) nearest in a predetermined direction, (ii) a position change DS of a position (134, 136) of the center of the laser spot; wherein the optical arrangement (100, 200, 300, 400, 500) is configured such that a condition DS + DP = n * L is valid for a continuous position change DS, and wherein n is a natural number; wherein L is a distance between two adjacent interference maxima (140, 240, 340) of the interference pattern (108, 208) in the predetermined direction, including a tolerance range of ± 5%; and wherein the distance change DP is defined by a difference of a first distance and a second distance; and wherein each of the first distance and the second distance is defined in the predetermined direction. an optical arrangement (100, 200, 300, 400, 500); at least one movable mirror and an actuator arrangement for controlling the at least one movable mirror; wherein the optical arrangement (100, 200, 300, 400, 500) comprises an input for receiving a laser beam; wherein the at least one movable mirror is arranged to change a state of the laser beam at the input; and wherein the optical arrangement (100, 200, 300, 400, 500) comprises a beam splitter which splits the laser beam into at least two partial beams (104, 204); and wherein the optical arrangement (100, 200, 300, 400, 500) recombines the partial beams (104, 204) into a laser spot for generating an interference pattern (108, 208) in the laser spot; wherein a change of an angle of incidence of the laser beam with respect to the input and optionally additionally a change of a position of the laser beam at the input causes at least one of the following: (i) a distance change DP of a distance (141, 241) between a center of the laser spot and an interference maximum of the interference pattern (108, 208) nearest in a predetermined direction, (ii) a position change DS of a position (134, 136) of the center of the laser spot; (i) a distance change DP of a distance (141, 241) between a center of the laser spot and an interference maximum of the interference pattern (108, 208) nearest in a predetermined direction, (ii) a position change DS of a position (134, 136) of the center of the laser spot; wherein the optical arrangement (100, 200, 300, 400, 500) is configured such that a condition DS + DP = n * L is valid for a continuous position change DS, and wherein n is a natural number; wherein L is a distance between two adjacent interference maxima (140, 240, 340) of the interference pattern (108, 208) in the predetermined direction, including a tolerance range of ± 5%; and wherein the distance change DP is defined by a difference of a first distance and a second distance; and wherein each of the first distance and the second distance is defined in the predetermined direction.