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The common sense of laser lens operator's protection and the function of YAG lens
The laser lens of laser welding machine belongs to 4 types of laser equipment. Direct strong laser irradiation can cause serious damage to human skin, and even more serious, blind eyes. The debugging operator must have common sense of laser safety protection. You must wear special laser protective glasses with the corresponding laser wavelength. Note: The adjustment of the laser must be carried out by specially trained personnel, otherwise it will cause damage to other components on the optical path due to laser misalignment or polarization adjustment.
(1) In order to ensure that the laser is always in a normal working state, after two weeks of continuous operation or when it is not used for a period of time, first deal with the laser module and dielectric diaphragm before starting the machine Check the components in the optical path such as lens protection glass and confirm that there are no abnormal phenomena such as dust pollution and mildew on the optical components. If the above phenomena occur, the laser focusing lens should be processed in time to ensure that the optical components will not be damaged under strong laser irradiation. . (If the use environment of the equipment is relatively clean, the above inspection can be extended to one month or even longer accordingly)
(2) Equipment operators can often check the laser output with black paper If spot unevenness or energy drop is found, the resonant cavity of the laser should be adjusted in time to ensure the beam quality of the laser output.
(3) The purity of the cooling water is the key to ensuring the laser output efficiency and the life of the laser concentrating cavity components. The conductivity of the internal circulating water should be checked once a week during use. To ensure the conductivity of 30.5MW·cm, the deionized water in the internal circulation must be replaced once a month, and the conductivity of the newly injected pure water must be 32MW·cm. Observe the color change of the ion exchange column in the laser protection mirror system of the cooling system at any time. Once the color of the resin in the exchange column changes to dark brown or even black, the resin should be replaced immediately.
Plan focusing lens, also known as j laser field lens, f-theta focusing lens, is a professional lens system, the purpose is to put the laser beam in the entire marking plane A uniform focus spot is formed inside. Simply put, any point in a plane of a certain format is the focus lens of its focus, while the focus of an ordinary focus lens is only one point, and it is the point in the center. One of the most important accessories for laser marking machines.
Field lens can be divided into f-theta lens and telecentric lens. Due to the high cost and expense of telecentric lenses, F-theta lenses are mainly used in laser marking machines for industrial applications. Without the deformation of the laser collimator lens, the position of the focus point depends on the focal length of the lens and the tangent of the deflection angle, and the position of the focus point only depends on the focal length and the deflection angle, which simplifies the calculation method of focus positioning.
YAG lens -
For shooting, no filter should be the best. Especially when facing the light source, the glare brought by the YAG lens will definitely affect the picture. The function of coating is to minimize glare. The multi-coated YAG lens is coated with 6-8 layers of film on both sides of the lens to ensure a light transmittance of more than 95%. Therefore, YAG lenses are recommended to purchase multi-layer coatings with higher light transmittance. Buying some YAG lenses is to protect them while minimizing the adverse effects of YAG lenses on exposure and glare.
When it comes to protecting a lens, basically everyone needs a YAG lens to protect it. In daily use, as long as you are careful, the lens will not be stained because the lens cover can be closed at any time. But there are still some when you are not careful. The lens is dirty and heartaches. Wiping is afraid of scratching the lens. I only use the lens cap. Once you find the fleeting beauty, you need to take time to remove the lens cap. It is easy to miss it. Opportunity. Therefore, a YAG lens becomes the protective cover that everyone needs now. The YAG lens is one of the necessary components of a lens. Its main function is to prevent ultraviolet rays, reduce the blue-violet light waves transmitted to the photosensitive material, make the distant view clear, and improve the contrast and color saturation of the distant view. Although the CCD and CMOS used in DSLRs are not as sensitive to ultraviolet light as optical lenses, we still recommend installing a high transmittance YAG lens to protect the lens and avoid contamination or damage to the lens. Compared with the cheaper double-coated YAG lens, the multi-coated YAG lens has a higher light transmittance.
For some lenses, there is still a problem in installing YAG lenses. After the YAG lens is added, there is no way to cover the lens cap again. In this case, some In order to cover the lens cap, people use a knife, file and other tools to cut the screws on the side of the lens short, so that both the YAG lens and the lens cap can be added. However, this method has a certain risk, such an expensive thing, if it is missed, it can be miserable. The second method is to add a YAG lens when shooting, usually take off the YAG lens, and cover the original lens cover. Although it is a little troublesome, there is no risk after all!