Method for laser treatment of a substantially planar surface of a product, the method comprising: - arranging the product on a working table located in a plane XY which is defined by a first axis X and a second axis Y that is perpendicular to the first axis X; - positioning a laser head vertically in line with a reference point of the working table, the laser head being configured to emit beams at a predetermined frequency and comprising at least one rotatable optical system which is configured to direct the beams in a controlled manner towards the working table, - treating the whole surface of the product to be treated by applying beams onto the surface to be treated simultaneously to the movement of the optical system in accordance with predetermined laser parameters; wherein - the product is a textile web formed of optical fibres held parallel to each other by binding threads, the textile web being positioned centred with respect to the reference point and the optical fibres being positioned substantially parallel to the first axis X of the working table, the beams applied during the treatment altering the surface of the optical fibres by removal of material; - the surface to be treated is divided into a plurality of elementary zones in the XY plane, and the method further comprises applying a correction consisting in varying one or a combination of the following laser parameters, as a function of the position of each elementary zone in the XY plane: - the power of the beams generated; - the movement speed of the optical system; - the pulse frequency of the generated beams, all the elementary zones of the surface to be treated receiving a substantially identical predetermined average energy. - arranging the product on a working table located in a plane XY which is defined by a first axis X and a second axis Y that is perpendicular to the first axis X; - positioning a laser head vertically in line with a reference point of the working table, the laser head being configured to emit beams at a predetermined frequency and comprising at least one rotatable optical system which is configured to direct the beams in a controlled manner towards the working table, - treating the whole surface of the product to be treated by applying beams onto the surface to be treated simultaneously to the movement of the optical system in accordance with predetermined laser parameters; wherein - the product is a textile web formed of optical fibres held parallel to each other by binding threads, the textile web being positioned centred with respect to the reference point and the optical fibres being positioned substantially parallel to the first axis X of the working table, the beams applied during the treatment altering the surface of the optical fibres by removal of material; - the surface to be treated is divided into a plurality of elementary zones in the XY plane, and the method further comprises applying a correction consisting in varying one or a combination of the following laser parameters, as a function of the position of each elementary zone in the XY plane: - the power of the beams generated; - the movement speed of the optical system; - the pulse frequency of the generated beams, all the elementary zones of the surface to be treated receiving a substantially identical predetermined average energy.