During process of working in laser environment, we need wear laser protective glasses to prevent eye damage at below fields. 

                          E.g *Industrial laser machine, such as laser marking machine, laser cleaning machine, laser welding machine, etc

                                *Laser parts, industrial laser as well as medical laser

                                *Medical laser machine, such as 808 laser machine, dental laser parts

                                *Pet laser care

                                *Laboratory laser

                                *Other laser environment

            

                              When we search on internet about laser safety glasses? We would find a lot of results with various lens and parameters. Then 

                          how to find available goggles? Hope this article will be helpful to you to make decision. 

                              First of all, Laser wavelength means protective laser wavelength range. E.g OD6+ @ 180-480nm&750-1100nm 45% VLT, this 

                          glasses can cover laser wavelength range both 180-480nm and 750-1100nm, OD6+ optical density as well as 45% VLT. 

                              As if our product is 532nm laser, then our best choice for laser glasses is 180-532nm; if 355nm laser, best choice is 190-400nm; 

                          if 532nm and 1064nm laser machine, best choice is 180-540nm&750-1100nm. Usually glasses covering double laser wavelength 

                          range would be more expensive than covering single laser wavelength range. 

     

                              Secondly, OD refers to optical density. In terms of optics, D=Lg(Ei/EL) or D=Lg(Hi/EL). Simply speaking, OD value is n, then 

                          strength of light would be attenuated by 10(n) times. 

                              E.g OD = 1, intensity of light will be attenuated by 10 times; OD = 2, intensity of light will be attenuated by 100 times. If power 

                          of our laser is 100W, and it is 100W/100 = 1W at attenuation of 100 times. So it seems that there is no danger of 1W laser, we 

                          would have question, is it enough for OD2 to choose glasses? Answer is No. Simple to say, for same output energy, peak power of 

                          different laser is definitely different, then OD we need also differ. Furthermore, our eyes have a protective threshold for laser in 

                          different wavelengths. That is, at a certain value, our eye can absorb the laser of a specific wavelength and won't be damaged. 

                          And threshold can be changed by wavelength and pulse. Usually we call 532nm blind light, because our eyes are more likely to be 

                          damaged by 532nm, the threshold is low. But our eye has relatively high ability to withstand CO2 laser. Therefore, the calculation 

                          OD value is based on professional calculations. 

                              After selecting protective laser range, we suggest you ask professional salesperson about detailed parameters. That would be 

                          helpful for us to select proper laser safety goggles. 

     

                              Lastly, VLT(Visible Light Transmission), which simply means how much visible light can transmit lens. There is another question, 

                          what is visible light?Answer is visible light is part of electromagnetic spectrum that our eyes can perceive. General speaking, 

                          wavelength of visible light would be 780-400nm with colors. E.g 450nm for blue light, 532nm for green light, 600nm for red light etc. 

                          But also many fiber laser is invisible light, e.g 1064nm. Then let's talk about VLT. If glasses mark 70%VLT, which means 70% visible 

                          light can transmit lens. 

      

                    For laser protective glasses, protective windows and other protective goods, the most important parameters we should concern 

                are laser wavelength, optical density as well as VLT. Usually OD4+ more is enough to protect, but how to choose proper optical density? 

                That mostly depends on power of laser machine. In medical laser environment, we choose OD4+~OD5+ is good. In industrial field, 

                OD5+~OD6+ for hundreds of laser power, and OD6+~OD7+ for thousands of power.

                              Above is our suggestion about choosing proper laser safety glasses. If you have more question, kindly advise us whenever you 

                          want via email.

                             

                              Shenzhen DSH Laser Technology Co., Limited

                              Contact: Daniel Hu

                              Email: info.hu@dsh-laser.com