49results about How to "Focus spot is small" patented technology

The invention provides an F-theta lens and an optical system. The F-theta lens comprises a first lens and a second lens, which are arranged in a light propagation direction in sequence; the first lens is a crescent-shaped negative lens; the second lens is a crescent-shaped positive lens; and curved surfaces of the first lens and the second lens are both bent toward a light incident direction; the incident light wavelength of the lens is 10.6 microns, view field angle 2 omega of the lens is 70 degrees, light incident aperture of the lens is 30 mm, and the scanning range of the lens is 608 mm X 608 mm. The F-theta lens provided by the invention is a large-range field flattening lens, which is designed through double-plate type negative-positive focal power distribution; and on the premise that energy concentration and small focusing spots of a laser are guaranteed, a scannable range can be further enlarged, so that the F-theta lens provided by the invention is beneficial for enlarging the application range of the laser machining industry.

The invention discloses a laser multipoint focusing processing system, wherein the structure of the system is as follows: a laser, a beam expander, a light guide lens, a focusing lens and first and second total reflection mirrors are sequentially located on the same light path, the first total reflection mirror is a spherical mirror or non-spherical mirror processed with a minipore at the middle part, and the curvature radius of the first total reflection mirror is smaller than a half of the minimal distance between the two total reflection mirrors; at work, the concave surface of the first total reflection mirror faces to an xy two-dimensional work table, and the optical axis of the first total reflection mirror is overlapped with the optical axis of the laser; the centre of the minipore is overlapped with the optical axis of the laser; and the position of the focusing lens is adjustable up and down, and the distance between the two total reflection mirrors is adjustable. The system can convert a single focusing point introduced by the laser to a transparent material into a plurality of focusing points with the same optical axis, thereby improving the laser energy absorption uniformity of the cut and separated transparent brittle material along the thickness direction so as to reinforce the heating uniformity of the transparent material along the thickness direction and sharply reduce the stress difference along the thickness direction to cut and separate the transparent brittle material in high quality, high efficiency and high success rate.

The invention discloses a laser machining method and system. The laser machining method comprises outputting heating laser beams and machining laser beams from an incident laser light source through laser focusing; forming a laser thermal lens or a laser thermal lens group on the laser incident surface of materials to be machined and or inside the materials to be machined through the heating laser beams; performing collimation or similar collimation on the machining laser beams through the laser thermal lens or the laser thermal lens group to obtain the long machining optical path length beams or performing further focusing on the machining laser beams through the laser thermal lens or the laser thermal lens group to obtain high laser peak power density of small focusing light spots; performing laser machining on the materials to be machined through the long machining optical path length beams or the focusing light spots. According to the laser machining method, the long machining optical path length beams in comparison with the traditional laser focal depth or the high laser peak power density of small focusing light spots can be obtained through the thermal lens effect and the laser machining method is suitable for machining of thick transparent or partially-transparent hard brittle materials.