Windows are applied to isolate different physical environments while allowing light to pass. When selecting windows you should consider materials, transmission, scattering, wave front distortion, parallelism and resistance to certain environment. China star optics offers a wide range of different materials and different degree of precision windows.
Material: BK7 or other materials Length tolerance:+/-0.01 Width tolerance:+/-0.01 Center thickness tolerance:0.005mm Surface quality:80-50~10-5 Surface flatness<lambda~lambda/20 Parallelism<=1min~2sec Clear Apenture:80%~100%