|Diameter tolerance||+0/-0.1 mm|
|Thickness tolerance||±0.1 mm|
|Clear aperture||>90 %|
|Surface quality||20-10 S-D|
|Surface flatness||<λ/8 @ 632.8 nm|
|Protective chamfers||<0,25 mm x 45°|
|Coating adhesion and durability||Per MIL-C-675A|
|Measured reflectivity||R >99.5 % (R >99 % @ 266 nm)|
|Laser damage threshold reports||www.altechna.com/lidt|
Wavelength separators, also widely called "dichroic mirrors" consist of multilayer dielectric coatings and are used to separate the various harmonic components of frequency doubled laser systems by selective spectral reflection and transmission. In all cases one wavelength is selected out by reflection and the other wavelengths are transmitted.
Coatings are provided by Ion Beam Sputtering (IBS) or Electron beam evaporation with/without Ion assistance coating techniques.
|Used to separate the spectral regions or specified wavelengths|
|Other dimensions are available in small and mass production quantities|
|Mass production capabilities: 10’000pcs per month|
|Any other our standard substrates can be coated with this type of coatings!|
|Altechna metrology lab applies following product inspection:|
|Visual inspection – surface quality evaluation according to MIL 13830 and ISO 10110 standards|
|Dimensions – measurement of geometrical dimensions, as diameter, thickness, etc.|
|Transmittance (Spectrophotometer, laser)*|
|Reflectance (Spectrophotometer, laser)|
|Wavefront distortion (Interferometer)|
|Parallelism (Goniometer, interferometer)|
Altechna offers a wide range of high performance optical coatings on standard, custom or customer supplied optics.
Our coatings cover wavelength range from deep UV (193 nm) to far IR (25 µm) with biggest part of coatings done in wavelength ranges of most conventionally accessible laser and illumination sources from 266 nm to 2 µm.
We offer a set of standard and custom coatings per individual request:
- Anti-reflection coatings
- High reflection coatings
- Beam splitter coatings
- Partially reflective coatings
- Polarizer coatings
- Filter coatings
- Ultrafast GDD compensated coatings
- Gires-Tournois interferometer mirrors (GTI)
- Variable reflectivity mirrors
- Metallic coatings
At Altechna we aim to provide high damage threshold, high quality coatings for constantly growing photonics market with highest standards.
Each coating is special and over the years in the photonics field we have learned that flexibility is the key to meet high demands of our customers therefore our coatings are done using different technologies which are chosen for separate coatings individually. Here is our list of coating technologies available at Altechna:
- Electron beam evaporation
- Ion assisted deposition
- Ion beam sputtering
Each technology is different and is used according to requirements of spectral sensitivity, damage threshold, hardness, surface quality etc.
|Electron beam evaporation||Ion assisted deposition||Ion beam sputtering|
|Deposition Rate||>10 Å/sec||~10 Å/sec||~3 Å/sec|
|Coating area per run||3000 cm2||3000 cm2||500 cm2|
|Temperature Range During Coating||200 - 300°C||20 - 100°C||20 - 150°C|
|Number of Layers||1-50||~50||200|
|Density / Porosity||Porous||Dense||Near bulk|
|Adhesion / Durability||Low||Good||Excellent|
|Humidity Sensitivity||Yes||Yes, small||No|
|Aging Effects||Yes||Yes, small||No|
|Intrinsic Stress||< 100MPa||~ 100MPa||Few 100MPa|
|Coating code||Cotaing type||AOI||LIDT|
|5HJ45||HR@510-532nm+1020-1070nm||45deg||9.0 J/cm2 @532nm; 5.2ns; 50Hz|
Laser induced damage threshold (LIDT) measurements are performed on actual components produced by Altechna. Individual component’s LIDT depends on multiple parameters (substrate material, polishing batch, coating batch, storage conditions, etc). Damage threshold value reached for above individual components should be used for reference only but it is not guaranteed for all optics. Altechna can perform coating damage threshold testing service upon request.