Plane Windows
Narrowband Anti-Reflection coatings, often
referred to as "V" coatings, reduce surface reflectance to
less than 0.5% at the specified center wavelength and normal incidence.
These all dielectric coatings are sensitive to polarization, wavelength
and angle of incidence. They are durable and highly resistant to laser
damage.
Plane windows are used as substrates for a variety of applications,
such as laser windows, output couplers, beamsplitters, beam combiners,
mirrors, dichroic filters and plate polarizers. Considerations in selecting
window substrates include transmission range, absorption coefficient,
incident laser power density and environmental factors such as pressure,
temperature, moisture, abrasion and corrosion.
Plane Windows listed under UV / VIS / NIR substrates are specified for
applications involving coating wavelengths 193 nm ≤ λ ≤ 2.0 µm. Units for these substrates are given in mm.
Plane Windows listed under IR substrates are specified for applications
involving coating wavelengths λ ≤ 2.0 µm. Units
for these substrates are given in inches.
RMI STANDARD
SPECIFICATIONS
|
| Materials: |
BK7, UVFS, FS, CaF2,
MgF2, ZnSe, ZnS, Ge,
Si, Sapphire |
Surface Figure:
BK7, UVFS, FS:
CaF2, MgF2:
ZnSe, ZnS, Ge, Si:
Sapphire (2 grades):
|
Both Surfaces
λ/20 at 633
nm
λ/4 at 633
nm
λ/40 at 10.6
µm
λ/10, or λ/4
at 633 nm
|
Surface Quality:
BK7, UVFS, FS:
CaF2, MgF2:
ZnSe, ZnS, Ge, Si:
Sapphire (2 grades):
|
Both Surfaces
10-5
20-10
40-20
20-10 or 60-40
|
| Diameter Tolerance: |
+ 0.000", – 0.010" |
| Thickness Tolerance: |
± 0.010" |
Wedge:
|
≤ 3 arc minutes |
| Bevels: |
0.010" - 0.030" at 45º |
| Clear Aperture: |
Central 85% of diameter |
|
|
