Optical Products  Manufacturers, Traders, Suppliers

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.

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".

Zhejiang Crystal Optoelectronic Technology Co., Ltd. (COT) was founded on August 2, 2002 and listed on the Shenzhen Stock Exchange on September 19, 2008 (stock code 002273). In 2022, total revenue reached 43.76 billion yuan, with year-on-year growth of 14.86%, and the net profit climbed up to 5.95 billion yuan.
Over the past twenty years, COT has been a global optical expert in the field of information transaction, providing one-stop professional services from core components up to modules and solutions. At present, the company is involved in R&D and manufacturing process in five major industrial sectors, and its products include Optic Components, Thin-film Optics, Semiconductor Optics, Automotive Electronics & AR+, Reflective Materials, etc. The company has more than ten wholly-owned and controlling subsidiaries, and participates in multiple enterprises such as Japan Guangchi Co., Ltd., Ningbo Jishi Investment, Wuhan Wuyi Yuntong, Jingbang Optics, and Zhaoge Digital.
Our products span from Consumer Electronics, to Automotive Electronics and Metaverse. For Consumer Electronics, products such as Infra-Red Cut Filter (IRCF), Camera Cover Glass (CG), Narrow Band Pass Filter (NBPF) help COT to rank among the world's top producers and sellers. Our core competitiveness lies in its leading global technology integration ability to combine "Thin Film Design, Micro Nano Optic Techonology, Optic Cold Forming, and large-scale Automation" together. For Automotive Electronics, Head Up Display (HUD), Car Cams, and LiDAR window glasses have all been applied to the products and services of globally renowned vehicle manufacturers. For Metaverse, AI and display technology have developed rapidly in past few years, and COT has laid out a full technology path in the AR field to help incubate technology giants in mass production. In addition, the reflective materials produced by Zhejiang Yeshili, a wholly-owned subsidiary of Crystal Optech, have maintained a leading technological position in China for many years.
Looking into the future, with diversified application of Optics across different fields, the global optical industry has ushered in a golden opportunity. Crystal Optech will adhere to the guiding principle of "globalization, technology-oriented, and open cooperation", uphold the business philosophy of "be noble in life, be excellent in work", shoulder the mission of "innovation makes optics stronger, optics makes the world a better", and strive to "become an outstanding one-stop optical expert in the world"!

Established in 2002, Wavelength Opto-Electronic is a national high-tech company with fully integration of optical design, manufacturing and technical support to our worldwide customers. Wavelength Opto-Electronic Locates in Jiangning Hushu industrial park, Nanjing with an area of more than 13000 square meters, we adhere to the core values of “customer, quality, innovation, and efficiency”, follow the mission of “broaden the wavelength”, and advance to our vision of “becoming the leader in the world photonics industry”.In 2014, Our Company was successfully listed on National Equities Exchange and Quotations (NEEQ). In 2016, the infrared division and EFID were set up, which has grown at a rate of over 50% annually in the past 4 years.Wavelength infrared is building core competence in the High-end quality optics industry. Our production capacity covers the entire process of material growing, cutting, grinding, polishing, diamond turning, molding, injection molding, thin film coating, assembling and quality testing assurance. The company has passed ISO9001 quality system and ISO14000 environment system certification. Our products go into infrared detection technology, which are widely used in the security and surveillance, industrial monitoring, life sciences, power monitoring and other applications. Wavelength has 5,000 square meters of 100,000-level clean room and 1,000 square meters of optical fast prototyping workshop. With full line of quality assurance instruments such as Perkin Elmer spectrophotometer, Talysurf PGI profilemeters, LUPHOScan non-contact profilometers, Zygo interferometer, Optikos LensCheck system, Image Science MTF test bench, environment test chambers, we ensure every optic product a quality one.With our advance equipment and machines for production, test & measurement and quality control, plus vast experience and expertise of our optical know-how, we are able to provide good support to customer who needs customize infrared optics. We have also built a large inventory of off-the-shelf standard lenses for your choice. Wavelength infrared can be your one-stop shop for infrared optics.EFID, make the infrared vision splendid.Wavelength, your ideal partner for infrared optics.