Beijing Han shield four state science and Technology Co., Ltd. is an innovative high-tech companies, focusing on the application of semiconductor laser system products. More than and 10 years of painstaking research and development of the independent of fiber coupled laser diode series, laser power supply series, control power series three series products, as many as 300 kinds of products, products covered by the industrial application of laser processing (welding, cutting, sintering, engraving, marking, etc.) projection application, laser medical treatment, laser night vision monitoring research and application of laser display. Advanced product technology, process specifications, reliable quality, long life, to all walks of life, research institutes supporting the use of many years, enjoy a high reputation