The laser protection window is a working window installed on the laser equipment to observe the working conditions in the laser equipment, especially on the ClassⅢ and Class Ⅳ laser equipment. Because the ClassⅢ and Class Ⅳ lasers are too high, even diffuse reflection will hurt the eyes of the operator, let alone staring at the operation of the equipment for a long time.
Moreover, whether it is the domestic GB7247 (safety standard for laser products) or the European Union's EN60825 standard, it is mentioned that for ClassⅢand Class Ⅳ laser equipment, fixed or movable barriers that can block the laser beam or diffuse reflection must be installed. This type of baffle can be opaque, but in actual operation, the laser protection window that can be observed is more popular with manufacturers. However, there are many questions that can come up when purchasing laser protection windows, so we have listed some frequently asked questions and answers for your reference.
Application scenarios of the laser-protective Windows
Q1. Do only Class 3 and Class 4 lasers require laser protection Windows?
A1. GB7247stipulates that the ClassⅢ and Class Ⅳ laser equipment must be equipped, because the direct and diffuse reflection of Category 3 and Category 4 lasers are harmful to glasses and skin, so such equipment should be equipped with corresponding laser protection Windows. Even if the operation of such equipment may not require staff to observe nearby, there is no guarantee that there will be no accidents. But if the 2 types of laser is also installed protective Windows, of course, are also the best, which is undoubtedly better to protect the safety of the operator.
Q2. The thicker the laser protective glass, the higher the protection factor ？
A2. No, the common laser protection window on the market has the choice of 5mm and 3mm thickness, but their parameters are the same, but the thickness is different (just because of the window design needs of the equipment); Similarly, in the absence of parameter comparison between two laser protection Windows of different thickness, the thicker the protection window, the higher the parameter. However, if two 3mm thick laser guard Windows with OD4 at 532nm wavelength are used side by side, the protection factor will be higher than a 3mm thick laser guard window with the same parameters.
Q3. What is the difference between laser protective glass, PMMA protective window and PC protective window?
A3. Due to the different base materials, the parameters of the final product will vary greatly. The following is a comparison of the advantages and disadvantages of different base material protection Windows:
| Material | Advantage | Disadvantage |
| Glasses |
▪More resistant to scratching ▪More resistant to high temperature |
▪The maximum size of the protective window is 30*20cm ▪Fragile, impact resistant ▪The same volume weighs the most and is not easy to transport and assemble |
| PMMA |
▪The VLT is higher than the PC ▪Shock resistance ▪Logistics and assembly are more convenient and simple |
▪ High-temperature intolerance ▪The flame retardant property is not as good as PC |
| PC |
▪Most impact-resistant High temperature ▪Resistance and flame retardant ▪Logistics and assembly are more convenient and simple |
▪Poor surface strength, easy to wipe flowers ▪VLT is lower than PMMA |
Due to the high cost of laser protective glass, stitching, and transportation is not convenient, so the most common in the domestic market is PMMA, because of better light transmissibility and light transmissibility will affect the clarity of the observation of Windows, of course, there are a few manufacturers of PC protective Windows, which changes according to the needs of equipment manufacturers. The price in the table is only a common price range in the domestic market, different performance, parameters, and manufacturers will affect the price.
Q4. Do you not need laser-protective glasses with laser-protective Windows?
A4. If the equipment is equipped with the appropriate parameters of the laser protection window, according to the reason for the operation of the equipment personnel does not need to wear laser protection glasses, because wearing glasses will greatly affect visual clarity, after all, the higher the OD value of the lens/window, the lower the VLT, that is to see around the object will be darker. But if the installation of laser protection window staring equipment, but also obviously feel uncomfortable glasses, it is recommended to wear glasses, this may be because the laser protection window parameters do not match or a damaged place caused by light leakage. Of course, in the equipment for laser calibration and debugging, it is necessary to wear glasses to ensure the safety of human eyes.
Q5. Why are most laser-protected Windows absorbent?
A5. First, because absorption protection is all-round protection, that is, no matter which direction the light comes from, it can be absorbed instantaneously, but reflective protection can only effectively protect the light emitted from the normal line, and the emission direction of each beam of the light source cannot be guaranteed in practical operation; Second, because the laser protection window in the process of handling and installation will inevitably produce scratches, and the equipment in the factory people come and go, there will be a wipe hanging situation. The biggest advantage of absorption protection is that even if there is a scratch will not affect the protective effect of the window, and the reflective protection is mainly on the surface of the reflective film, once the reflective film is hung badly, the whole window is invalid, so it is not practical in the actual factory environment.
Q6. Can laser-protected Windows be scrubbed and disinfected with alcohol?
A6. No, since most of the base material of laser protected Windows is an organic material, it is not allowed to use high-concentration alcohol, acetone, or dichloroethane compounds cleaning, if there are fingerprints and marks on the window, can be cleaned with fewer than 2% alcohol liquid or soapy water, and dry with dry glasses cloth
Q7. Can the laser shield window protect against direct laser rays?
A7. No. Many friends think that laser protective Windows or laser-protective glasses can protect any laser, which is a misunderstanding of all laser-protective products. All laser protection products only protect the diffuse reflection of the laser, or block a certain amount of energy for a moment of direct exposure, but if the energy is too high or the duration of direct exposure is too long, protective glasses and protective Windows are very easy to be pierced by the laser. So when using any laser protection products, remember not to let the laser directly.
These are our answers to frequently asked questions. If you have any more, please feel free to contact us~
Email: info@loshield.com
Tel: 0086-18092277517
FAX: 86-29-81323155
WhatsApp：0086-18092277517
