HGO is granted ISO9001:2008 since Year 2010. Our team are professional and mostly have over 10 years' crystals and optics processing experiences. What is more, We are well equipped with advanced metrology instruments and measurment systems such as Zygo interferometer, UV-Vis-NIR spectrophotometer, Nikon microscope,Laser video, stress measurement system, extinction ratio measurement system etc. which can guarantee all your parameters.