Optical coating

Optical coating on the optical element is very important, which can improve the transmission, high reflection, alter the
absorbance or polarization properties. The components being coated are usually called the substrates. The coating layer is
deposited in high vacuum using the process of evaporation by either e-beam or Ion Assisted Deposition. Uni-Optics offers
all kinds of anti-reflective (AR coating), high reflective (HR Coating) partial reflective (PR Coating) and interference coating
according to customers requirement. 

Coating definitions: Ro: Reflectance at central wavelength  Rs: Reflectance for S-plane polarization
Rp: Reflectance for P-plane polarization
R: Reflectance for random polarization  

Tp:Transmittance for p-plane polarization
Ts: Transmittance for S-plane polarization 
T: Transmittance for random polarization


Quality Standard
Uni-Optics well-analytical equipment allows a variety of measurements. measure the coating spectral curves by
Perkin-Elmer Lambda 950(UV/VIS/NIR) spectrophotometer for our coatings.
Abrasion:  Mil-C-675A
Adhesion:  Mil-M-13508C
Hardness:  MIL-M-13508C

Coating material
Coating material is used some high pure metals, dielectrics and semiconductors. All of our coating materials are according with RoHS request. Main coating materials we used are:
Metal: Al, Ag, Cu, Au, Cr, Ni-Cr
Oxides: SiO2ZrO2 TiO2, Nb2O5, Ta2O5, , HfO2, Gd2O3, Al2O3, etc
Fluorides: MgF2, LaF3
Sulfides: ZnS
Semiconductors: Si, Ge