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GRT(Beijing Guangruntong Technology Development Co., Ltd.) is headquartered in Beijing Zhongguancun Hi-Tech Park and began in April 2008. GRT has gathered a group of senior R&D personnel with an average age of more than 15 years. Under the background of the rapid development of the optical fiber industry and the optical fiber to households, GRT has always adhered to the strategic principles of quality and innovation, and has gradually grown into a high-tech fiber optic company that is currently well-known in China, which integrates R&D, production and marketing, and has its own intellectual property and its own brand.
The main products of GRT are Optical Fiber Network Cards, Optical Fiber Modules, WDM devices, Optical Converter, Optical Fiber Patch Cord, and Optical Splitter. All kinds of products have passed international certification such as FCC, CE, and ROHS, as well as national industry certification, and have won a number of scientific and technological progress awards and excellent product awards. On the road ahead, GRT is committed to building China's own national enterprises, achieving the goals of "Optics Links The World, Connects Us Togetcher".

Beijing High-precision Technology CO., Ltd is a high-tech enterprise focusing on the development and manufacturing of precision/ultra-precision products. Based on nanometre-scale manufacturing and processing technology, we support the national high-technology strategic blueprint with core technology. We also serve the national high-end manufacturing industry with micron-/nanometer-scale manufacturing system and provide the vertical market with support and systematic solution to improve its core competence.
       Based on Theory, Solve with Collaboration, Breakthrough Technology, and Tested by Customers as our mission, Atoman launched research on the mass production technology on critical functional components and precision/ultra-precision special equipment to meet the mass production need of national and international markets on precision/ultra-precision processing machine tool. These include research on the critical functional components, the critical technology of high-stability drive control and systematic research focusing on the design of the structure, optimization of the manufacturing process, and manufacturing techniques of critical functional components processing units. These researches support the demand for precision/ultra-precision processing equipment market with critical functional components, develop a complete manufacturing chain to meet the need of specific customers, solve the problem of technology gap of precision/ultra-precision products in China and improve the competence and creativity of advanced technology in China.
         Bearing the expectation of generations of technology talents in the filed of nano-manufacturing, precision optics, ultra-precision equipment research and design, Atoman integrate relevant resource from different levels and deepness home and abroad and target on building the most competitive nanometer-scale technology research and processing manufacturing platform with the most integrated technology system in China.

After more than 30 years' rapid growth since the foundation in 1990, CASTECH INC. has become a recognized leading supplier of crystals, optics and laser components in the world. In 2008 CASTECH successfully completed IPO in Shenzhen stock exchange. (Stock Code 002222) Today, at our 450,000 sq ft advanced facility, over 1000 employees are dedicating to satisfy customer needs in terms of performance and cost effectiveness.
Crystals for Laser and Telecom Application:
With more than thirty years' untiring effort, CASTECH has developed flux, Czochralski, water solution and Bridgman-Stockbarger crystal growing technology, now is a worldwide leading supplier with largest mass production lines in the world for LBO, BBO, Nd:YVO4 and KTP. In addition, we also provide CLBO, BiBO, KDP, KD*P, Yb:CALGO, Yb:KGW, Ti: Sapphire, TGG, TSAG, α-BBO and other crystals for laser and telecom industries.