Surface Modification Influence of SiC Mirrors on Signal Noise Ratio of TMC Optical System[J]. Optics and precision engineering, 2009, 17(12): 2952-2958.
Surface Modification Influence of SiC Mirrors on Signal Noise Ratio of TMC Optical System[J]. Optics and precision engineering, 2009, 17(12): 2952-2958.DOI:
Signal noise ratio of TMC optical system is significantly influenced by the intrinsic defects of SiC (Silicon Carbide) mirror. After applying surface modification technique
Wyko profilometer indicates the roughness of a SiC mirror is reduced from 10.42nm (Ra) to 0.95nm (Ra). Then silver coating and enhanced coating have been coated on primary mirror
secondary mirror
tertiary mirror and fold mirror. Reflectivity is higher than 98% of each mirror between 0.5μm-0.8μm wavelength. Calculation results indicate that signal noise ratio has improved 5% after surface modification.