SJGD, founded in 2000, has more than 50 employees, including 4 senior engineers and 6 experienced technicians.       SJGD manufactures optical products of Waveplates, Corner Cube Retroreflectors, Penta Prism, Beamsplitter Cube, Polarization Beamsplitter, Non-Polarization Beamsplitter, Weenie Prisms and other custom made optical products.       We proceeded the most advanced optical metrology equipments, including, 5 plano interferometers, Ocean Optics S2000 Spectrometers, own designed retardation tester for waveplates, special interferometers for Penta Prism, special interferometers for Corner Cube Retroreflectors.