 |
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. Frenel? laws can be summarized
the following two equation |
Coating Room |
|
:
When reflected and refracted rays are perpendicular
to each othere(q1+q2= 90), the reflected light is
completely s-polarized. This angle is called Brewster?
angle.
Optical coatings are used to alter the reflectance,
transmittance, absorbance, or polarizer properties
of optical components. The optics being coated is
usually called the substrate. The coating is deposited
in high vacuum using the process of evaporation
on substrate. Coating material include metal (Au,
Al, Ag, Ni-Cr, Cr and so on), dieletrics(Oxides,
Fluorides and Sulfides) and semiconductors(Si, Ge).
Optical interference coatings respond
differently to s and p polarized light. For this
reason, it is essential to specify s, p, or random
(the average of the s and p performance) polarization
when the angle of incidence exceeds 20 degrees.
1.AR
Coating
 |
R0<1.5%@540nm
R<2%@400-700nm
|
| Single
Layer MgF2 Antireflective Coatings |
 |
R0<0.25%@1064nm |
| Multilayer
Antireflective Coatings |
 |
R<0.6%@450~650nm
R<1.0%@420~700nm
|
| Multilayer
Broadband Antireflectance Coatings |
 |
R0<0.25%@1064nm
R0<0.5%@532nm
|
| Dual
Wavelength Band Antireflective Coatings |
2.PR
Coating
 |
R0=
90%±2.0%1064nm |
| Single
Wavelength Band Partial Reflective Coatings |
 |
R= 50.0%±5.0%@450-700nm |
| Broadband
Partial Reflective Coatings |
3.Beamsplitter
 |
RS>99.5%@632.8nm
RP<5.0%@632.8nm
|
| Laser
Line Polarization Beamsplitter Coatings |
 |
RS>99.0%@450~650nm
RP<5.0%@450-650nm
|
| Broadband
Polarization Beamsplitter Coatings |
 |
R>99.5%@1064nm
R<15%@532nm
|
| Dichroic
Beamsplitters Mirrors |
 |
R>99.5%@532nm
R<10%@1064nm
|
| Dichroic
Beamsplitters Mirrors |
4.DPSS
Coating
 |
R<0.1%@1064nm
R<0.5%@532nm
|
| AR/AR@1064&532nm
on KTP |
 |
R>99.8%@1064nm
R<5.0%@532nm
|
| HR@1064&HT@532nm
on KTP |
 |
R0<0.1%@1064nm |
| AR@1064nm
on Nd:YVO4 |
 |
R>99.8%@1064nm
R>99.0%@532nm
R<5.0%@808nm
|
| HR@1064&532nm,
HT@808nm on Nd:YVO4 |
 |
R>99.8%@1064nm
R<5.0%@808nm
|
| HR@1064
& HT@808nm on YVO4 |
 |
R>99.8%@1064nm
R<5.0%@532nm
|
| HR@1064
& HT@532nm on BK7 |
5.HR
Coatng
 |
R0>99.8%@1064nm |
| Dielectric
High Reflective Coatings |
 |
Ravg>87%@200~1200nm
(Protected -Al)
Ravg>93%@200~1200nm
(Enhanced -Al)
|
| Metallic
High Reflective Coatings |
|
