The full reflection lens must be made of quartz to ensure that it is not easily broken down.
The laser oscillates back and forth in the cavity, and all the light transmitted to the full reflection lens is reflected back to the cavity to ensure sufficient power output from the laser. Therefore, the full reflection lens is coated with anti-reflection film and must be able to withstand large power without being damaged.
The surface of the coating faces the concentrating cavity when installed. if found a clear white point or detected by the dimmer and the green laser has passed through, it will affect the cutting speed and the cutting thickness, and needs to be replaced immediately.