Laser application in optical lens repair and coating technology

by:Crylight     2021-05-20

Engineers have developed a laser processing technology used in the manufacturing process of optical lens elements, which is particularly suitable for the production of low-cost aspheric and free-form surface products. Engineers can use this process to manufacture optical products of any shape.

  The surface curvature of aspherical lens is different from that of ordinary spherical lens. In order to pursue the thinness of the lens, the curved surface of the lens must be changed. The aspheric design corrects the image and solves the problem of distortion of the horizon. At the same time, it makes the lens lighter, thinner and flatter, has excellent impact resistance, and ensures the safety of the wearer.

   Until now, the production process of aspheric lenses mainly includes grinding and polishing steps, which are expensive and time-consuming, and the output of optical lenses is extremely low. The production process developed by a young research team at the Fraunhofer Institute for Laser Technology can produce aspheric and free-form lenses through the use of laser radiation, ablation and remelting processes.

  Engineers have been able to use molten quartz glass to produce aspheric and free-form lenses with various curvatures. In order to do this, they apply different process technologies to the production process.

   First, they heated the carbon dioxide laser beam to over 2230oC to selectively evaporate and ablate unnecessary substances. Next, carbon dioxide laser radiation heats the surface of the lens to the evaporation temperature until the outermost material melts into a liquid. The surface of the lens is designed to be smoother due to tension. After the lens is cooled, laser polishing is performed.

  Because the surface shape of the optical lens is generated by computer data, this processing technology can be customized according to the manufacturer's individual requirements, without the need for extensive equipment transformation. Compared with the traditional manufacturing process, this process can shorten the time of manufacturing optical lenses to one tenth of the original, and the time saved by manufacturing complex free-form surface products is more objective. This means that the cost of mass-producing small and medium-sized components is constantly decreasing, but the flexibility is constantly improving.

   Often keeping the optical glass sheet clean will increase the life of the optical glass sheet. Because pollution will cause many problems in the lens, the uneven distribution of laser power during reflection, the uniform laser lens makes the lens base temperature high, and the marginal temperature is low. This kind of change is optically called the lens effect.

   Failure to comply with the requirements and precautions for lens finishing, and random handling will result in new pollution and even scratches on the optical glass sheet, resulting in unnecessary losses. Usually, you should be careful not to let the mirror directly touch the hard objects. When scrubbing, it is best to clean it with water (or a small amount of detergent), and then use a special test cloth or excellent tissue paper to absorb the water droplets on the spectacle lens. If the lens is not scratched, it cannot be used all the time.

   Precision cold processing of optical lenses: mainly for high-precision optical parts (K9, B270, BK7, Borofloat33, etc.), quartz glass (JGS1, JG high-power laser mirror group S2, JGS3), precision processing of crystal materials (gems, calcium fluoride, zinc selenide, silicon oxide, etc.), colored optical glass, etc. The products that can be processed are: windows, special-shaped lenses, prisms, tempered lenses, silk screen lenses, etc.

   Photovoltaic energy-saving products: Ultra-white photovoltaic glass makes full use of the diffuse reflection of the special pattern, greatly reducing the reflectivity of light, so that the light is solar-powered when illuminated from various angles. High transmittance, to ensure that the glass itself absorbs solar energy to a minimum; at the same time, the green formula can fully meet the strict environmental protection requirements of Europe, the United States and Japan. Ultra-white embossed photovoltaic glass is an ideal packaging material for solar cell modules .

   Infrared cut filter, anti-reflection coating: The reflector infrared cut filter can effectively suppress the ripple caused by the passage of light waves higher than the spatial frequency of the CCD or CMOS image sensor Disturbance, and effectively suppress infrared light waves, improve the effective resolution and color reproduction of CCD and CMOS image sensors, make the image clear and stable, and the anti-reflection coating can effectively reduce the reflected light on the lens surface and improve the light penetration in the optical components.

  Optical lens coating: advanced coating equipment can coat all kinds of optical products. The types of coatings that can be coated are: antireflection coating (anti-reflection coating), reflective coating, infrared Cut-off film, spectroscopic film, etc., coating equipment and testing instruments, can meet customer related requirements in terms of film control, spectroscopic requirements, product appearance, environmental testing, etc.

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