As the price of fiber lasers falls, more and more customers are buying 50-watt fiber marking machines. Optical fiber marking machine suppliers found that people often reported that there was no problem when marking a few minutes before the 50-watt machine was turned on. After about 5 minutes, the marking effect is not good. Shut down and wait for a while, and then turn on the machine and can mark normally for a few minutes. After a few minutes, the effect is not good again.

　　So what is causing the bad marking effect? The customer has changed the field lens, but the same problem still occurs. The same problem occurs when the laser is changed. The same problem occurs when the galvanometer is changed. The same problem occurs when the marking card is changed. Later, after the customer had a problem, he tried to adjust the lifting and lowering of the column, and found that after slightly moving the height of the column, the marking effect seemed to be OK again, that is to say, the machine was out of focus after a few minutes of marking.

　　From the feedback from the customer, the fiber marking machine supplier estimates which lens is caused by thermal deformation, and the most likely one is the beam combiner, so the optical fiber marking machine supplier recommends that the customer try to change a beam combiner first. Change to a beam combiner made of quartz, preferably imported quartz. After the customer received the goods, they tested it, and the effect was good, and there was no defocus.

　　The optical fiber marking machine supplier summarizes that for the optical fiber marking machine, if it is a marking machine of more than 50 watts, if you need to use a beam mirror, you must remember to use a quartz material.