福晶科技：公司产品包括晶体元器件、精密光学元件和激光器件等

Group 1 - The company, Fuzhicheng Technology (002222), provides products including crystal components, precision optical components, and laser devices [1] - The main applications of the company's products are in the fields of lasers and optical communications [1] - The specific business situation will be disclosed in the company's regular reports or announcements [1]