AgniRoth OPTIK supplies infrared (IR) and far infrared (FIR) optical components to the commercial and military markets. Our experience ranges over several materials including –
Ge, Si, ZnS, ZnSe, GaAs, Sapphire, LiF, KBr, NaCl, KCl, KBr, CSi, CaF2, MgF2, BaF2. Along with crystals, we work with other optical glasses and Fused silica as well for UV and IR applications.
Our manufacturing has developed special techniques to work with difficult materials such as ultra violet grade materials to bring in the desired surface quality and characteristics. Customers can select from a range of anti-reflection, attenuation, shortwave pass, longwave pass coatings to achieve the desired wavelength and transmission characteristics.
Final parameters for any custom component will depend of the material and desired
specifications, however, the tables below illustrates some typical component parameters and applications of some common crystals that we provide.
| Table: Typical Tolerances |
Size |
Up to 250mm |
Diameter Tolerance |
± 0.05 mm |
Thickness Tolerance |
± 0.05 mm |
Flatness |
λ (@ 632.8nm), up to λ/50 Precision |
Focal Length Tolerance |
± 1% |
Surface Quality (Scratch/Dig) |
60/40 Typical, 10/5 Precision |
Angle Tolerance |
< 3 arc minutes, Precision < 20 arc seconds |
Coating |
Custom |
| Table: Transmission Ranges & Properties of common Crystals |
Material |
Transmission range (µm) |
Typical use |
Properties |
BaF2 |
0.2 – 11 |
Windows, lenses, prisms |
Very resistant to high energy radiation but very sensitive to thermal shock and water at 500°C. Can be used dry to 800°C. Does not possess VUV transmission of other fluorides. Used as a scintillator for gamma ray detection |
Calcite (CaCO3) |
0.35 – 2.3 |
Windows, lenses, waveplates, Glan Taylor/Thompson prism, beam displacer, birefringent plate |
Naturally occurring crystals with high birefringence. Makes for large polarizing prisms and other rhombohedra |
CaF2 |
0.14 – 9 |
Windows, lenses, mirrors |
Low Refractive index so limited need for AR coatings. Wide acceptance in high power laser optics due to its low absorption |
GaAs |
1.5 – 13 |
Lenses, beam splitters |
Hardness and strength make it a good choice in hostile environments where dust or abrasive particles impact surfaces. Good alternative to ZnSe for high power CO2 lasers |
LiF |
0.104 – 7 |
Windows, prisms, lenses in VUV |
Gets attacked by atmospheric moisture at 400°C, softens at 600°C. Sensitive to thermal shock, high radiation causes color centers, material can get cleaved. |
MgF2 |
0.11 – 8.5 |
Windows, lenses, prisms |
Good candidate when extreme ruggedness is required. Highly durable as it is resistant to thermal and mechanical shock and to irradiation. Works across UV and IR range |
Crystal Quartz (SiO2) |
0.4 – 3.5 |
Windows, lenses, prisms |
Birefringence, ability to rotate plane polarized light, high damage/scratch threshold |
Sapphire (Al2O3) |
0.25 – 5.5 |
Windows, lenses, prisms |
Excellent optical, physical and chemical properties from vacuum ultraviolet to the near infrared. Extremely useful in high temperature/pressure applications in UV and IR |
Si |
1.2 – 8 |
IR reflectors, windows |
Absorption band at 9µm makes it unsuitable for transmission optics in CO2 lasers, but is widely used as a mirror |
ZnSe |
0.65 – 22 |
Windows, lenses, mirrors, prisms |
High transmittance in visible and infrared region makes its very popular for IR applications |
Ge |
1.8 – 23 |
Windows, lenses, prisms |
Its high refractive index makes it a choice candidate for ATR prisms. It covers the entire 8 – 14 micron thermal band and is widely used in optics systems for thermal imaging. |
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