Shandong Yanggu Constant Crystal Optics, Inc waxaa la aasaasay bishii Abriil 2006, oo ku taal aagga horumarinta dhaqaalaha Xiangguang, Degmada Yanggu, Gobolka Shandong.Waxaan ku takhasusnay cilmi baarista, soo saarista iyoiibintaindhaha iyo qaybaha indhaha.Alaabtayada ugu muhiimsan waxaa ka mid ah daaqada indhaha, prism, lens, beamplitter, filter, wedge, maran iyo iwm.