Our high quality optical coatings
Equipped with various coating systems (for E-beam, IAD coatings, anti-reflective coatings, low-absorption coatings) and an experienced team, Sill Optics is able to coat lenses quickly and qualitatively in-house. Special coatings with other specifications can be applied externally. This enables Sill Optics to offer a wide range of coatings for the short-wave UV range through to the far IR range. In addition to optical glass, other materials such as fused silica or CAF2 can also be coated.
Spezifications of our standard coatings
Below you will find the specifications and transmission curves of our standard coatings. The curves for individual runs may vary. Within the specified range, however, each batch is checked by our coating team so that all specifications are met in every case. We can also cover many other specifications with our special coatings.
| ENDING | TYPE | WAVELENGTH | SPECIFICATION |
|---|---|---|---|
| -065 | broad band | 400 nm - 900 nm | R < 0,5%, avg. |
| -199 | anti-reflective | 255 nm - 266 nm | R < 0,2% |
| -075 | anti-reflective | 355 nm | R < 0,2% |
| -574 | low-absorption | 343 nm - 355 nm | R < 0,2% |
| -373 | anti-reflective | 420 nm - 480 nm | R < 0,2% |
| -292 | low-absorption | 515 nm - 545 nm | R < 0,2% |
| -094 | anti-reflective | 800 nm - 980 nm | R < 0,2% |
| -328 | low-absorption | 1030 nm - 1090 nm | R < 0,2% |
| -450 | anti-reflective | 1000 nm - 1100 nm | R < 0,25% |
| -081 | anti-reflective | 1064 nm + 532 nm | R < 0,2% / R < 0,25 % |
Essentiality of coatings
Without coating, each transition from glass to air or vice versa would have reflection losses of approx. 4%. A large proportion of the power would therefore remain in the lens. This leads to low efficiency for both imaging and laser optics. In the case of laser lenses, the large proportion of radiation absorbed would also lead to a significant increase in temperature in the lens - and thus in turn to thermal effects and damage. Coating is therefore essential for all kinds of lenses. Optical coatings enable a smoother refractive index transition between air (n = 1) and glass (n = approx. 1.5). The closer the refractive indices of two neighboring materials are to each other, the lower the reflection loss of transmitted light. Our coatings can increase the transmission for certain wavelengths to values far above 99% per transition. Further information on the subject of damage thresholds and optical coatings can be found in our technicon. You are also welcome to contact our technical team (sales@silloptics.de) for personal advice.