OFR manufactures Solid Etalons in fused silica which
we will dielectrically coat as required. These 1" diameter
plates are polished together as a 6" diameter cluster which
is 1/20-wave flat (the finest we can resolve). Thus, we assume the
surfaces of each plate to be much flatter than the cluster. Surfaces
are parallel to ~ 1 arc second.
Catalog
Number |
Thickness |
Diameter |
Reflectivity
Both
Surfaces |
Wavelength |
| IE-0.5 |
0.5 mm |
1.0" |
85 - 90% |
inquire |
| IE-1.0 |
1.0 mm |
1.0" |
85 - 90% |
inquire |
| IE-2.0 |
2.0 mm |
1.0" |
85 - 90% |
inquire |
| IE-5.0 |
5.0 mm |
1.0" |
85 - 90% |
inquire |
| IE-10.0 |
10.0 mm |
1.0" |
85 - 90% |
inquire |
| |
Optical materials transmitting in the infrared are
generally much more costly than their visible spectrum counterparts.
Furthermore, there are many IR transmitting materials whose properties
are comparatively very different. Therefore, it is usually the application
which determines the kind of material to be used, along with other
factors such as cost, need for antireflection coatings, hygroscopicity,
abrasion resistance, and other mechanical properties. Throughout
this catalog, we list many IR transmitting components which we generally
stock as standards. However, we will specially manufacture most
optical components as required in the following materials.
| HYGROSCOPIC, LOW REFRACTIVE INDEX (AR COATINGS NOT NEEDED) |
| Material |
Useful
Spectrum |
Comments |
Comparative
Cost |
| NaCl |
UV-16 µm |
IR lenses, windows, prisms |
Moderate |
| KCI |
UV-20 µm |
IR lenses, windows, prisms |
Moderate |
| KBr |
UV-25 µm |
IR lenses, windows, prisms |
High |
Csl
|
UV-50 µm
|
IR lenses, windows
|
High
|
| NON-HYGROSCOPIC, LOW REFRACTIVE INDEX (AR COATINGS NOT NEEDED) |
| Material |
Useful
Spectrum |
Comments |
Comparative
Cost |
| CaF2 |
VUV - 9.6 µm |
IR lenses, windows, prisms |
Moderate |
| BaF2* |
VUV - 11 µm |
IR lenses, windows, prisms |
Moderate |
| MgF2 |
VUV - 7 µm |
Birefringent, Polarizing optics |
High |
| LiF |
VUV - 5 µm |
VUV lenses, windows, prisms |
High |
| *BaF2 is not suitable for CO2 laser applications. |
| NON-HYGROSCOPIC, HIGH REFRACTIVE INDEX (AR COATINGS NEEDED) |
| Material |
Useful
Spectrum |
Comments |
Comparative
Cost |
| Sapphire |
UV-6 µm |
Used for mechanical properties |
Very High |
| As2S3 |
VIS-10 µm |
General IR optics |
Very High |
| Ge |
2-20 µm |
Mostly CO2 optics |
Very High |
| Si |
2-10 µm |
General IR optics |
Very High |
| KRS-5 |
VIS - 40 µm |
Mechanically poor qualities |
Very High |
| ZnS |
VIS -11 µm |
General IR optics, CO2 optics |
Very High |
| ZnSe |
VIS -16 µm |
General IR optics, CO2 optics |
Very High |
| GaAs |
VIS-12 µm |
General IR optics, CO2 optics |
Very High |
| Ge-As-Se |
VIS -12 µm |
General IR optics |
Very High |
|
