Application of 355nm nanosecond ultraviolet laser light source in marking on transparent keys   Whether it is an Apple computer keyboard, a bathroom switch that is very popular now, or a hotel air-conditioning exhaust control panel, more and more switches and keyboards choose to use light-transmitting keys. The light-transmitting keys are easy to use and smooth, and can be used clearly in dark places, which provides convenience for many hotels and home decoration. So, how to make the light-transmitting keys smooth and the fonts regular and refined? RFH UV lasers have a say in this.