Whenever light passes from one medium into another medium with different optical properties, most notably refractive index, part of the light is reflected and part of the light is transmitted. The intensity ratio of the reflected and refracted components is a function mainly of the difference in refractive index among the materials, the polarization of the incident light and the angle incidence.
According to Fresnel's law, it is convenient to think of incident radiation as the superposition of two plane-polarized beams, p-polarized which electric field paralled to plane of incidence and s-polarized which electric field perpendicular to the plane of incidence. Fresnel equation can be summarized the following two equations:
When reflected and refracted rays are perpendicular to each other (q1+q2= 90), the reflected light is completely s-polarized. This angle is called Brewster's angle.
AR Coating
R0<1.5%@540nm
R<2%@400-700nm
Single Layer MgF2 AR Coatings
R0<0.25%@1064nm
Multilayer AR Coating
R<0.5%@450~650nm
R<1.0%@420~700nm
Broadband AR Coating
R0<0.1%@1064nm
R0<0.5%@532nm
DBAR Coatings
PR Coating
R= 50.0%±5.0%@450-700nm
Broadband PR Coatings
Beamsplitter Coating
RS>99.5%@632.8nm
RP<5.0%@632.8nm
HIgh Power Laser Line Polarization Beamsplitter Coatings
