In the average power output of laser, all lenses metropolitan due to the reason of the manufacturing process or polluted by external factors such as the lens of the laser wavelength absorption in particular, over time to make the lens shortened lifespan, caused by damage to the lens effect use even stop.
Lens of laser wavelength absorption increases can cause uneven heating lead to mirror reflection, the refractive index changes, the laser wavelength from high absorption lenses through or reflection of the laser power at the uneven distribution of the lens center temperature is high, the edge of the low temperature, produce the change in the optical lens effect.
Thermal lens effect caused by pollution cause lens high absorption will create many problems. Lens substrate of irreversible thermal stress, produced during the beam propagation through the lens of power loss, partial mobile focused light spot position, premature failure of the coating layer can result in damage to the lens. For exposure to the lens in the air, we was in a clear, often do not follow the requirements and matters needing attention of the lens cleaning materials casually, the result will cause new pollution even scratch lenses, caused irreparable damage. Based on years of experience so concluded that: no matter which kind of optical lens keep clean is one of the most important, to have good cleaning habits to careful cleaning the lens, can reduce or remove the pollution caused by man-made reasons. Such as fingerprints and spit the flower. As a common sense, when operated by hand to the optical system, regardless of the cleaning, disassembly, install all want to wear gloves or medical gloves, always keep follow the requirements and matters needing attention of cleaning the lens in the process of cleaning, use only materials, such as optical lens wiping paper, cotton swabs, reagent grade ethanol. For any lens cleaning, disassembly, install shortcuts will lead to the lens shorten life, and even permanent damage. So, we should use common sense to prevent the lenses from other causes of pollution, in case of moisture proof, smoke, dust and so on. Pollution in determining a lens, we need to wash the ears ball lens, not until the surface particles to be beautiful, don't use mouth to blow. Because the air blow out mostly oil and water will be further pollution lens. If after washing ears ball handling its surface pollution still exist, we will have to dip in with cotton swabs for laboratory grade acetone, ethanol to gently wipe. So you can remove most of the thin layer of pollution. Laser lens pollution in the will of the laser output and data sampling system pose a serious mistake, if we can make the lens keep clean, often will can prolong the service life of the machine.