Fibers, glass cells and UHV windows
Fibers
Naked or fully confectioned fibers can be coated in holders that are individually manufactured in the workshop in-house. In a rather “cold” process like Ion Beam Sputtering (IBS) or Magnetron Sputtering (MS) the coating of fibers is done, e.g. to achieve the evidently lowest reflectivities for AR.
For MS some meters of fibers can be hidden in the spaciouse drum or elsewhere behind the exposed surface. Even lower temperatures can be realised with IBS. Adapted fixturing is available for a wide range of fiber optics.
Coating on fibers
With ALD a conformal AR coating all around a fiber lens surface is possible. A residual reflection of < 0.25 % and a coating distribution of < 1% on overall thickness (TEM results) help to reduce losses when collimating light from diodes within fiber array packages (FAP). Even fiber lens diameters below 100 µm are available, can be coated for the desired wavelength and precisely cut to the specified length.
Glass cells
Glass cells / cuvettes have to be coated on up to five sides. They require specially designed substrate holders and optimized coatings.
With the experiences of more than 40 years, LASEROPTIK developed a technique to achieve a maximum clear aperture and reliable fixtures.
UHV windows
For coatings on UHV windows LASEROPTIK developed approved tooling as well as pre- and after-treatment processes. Standard holders for the most common sizes from CF16 up to CF160 are available.
The coating process will be adapted to the allowed maximum temperature and thermal gradient. Because of technical limitations UHV windows normally can only be coated with EBE technique.
The usual shadow-effects from the metal-flange will be reduced as far as technically possible in order to coat the maximum of the optical surface. Our experiences show that a coating will work in an area of about Ø 9 mm for CF16, Ø 29 mm for CF40 and Ø 57 mm for CF63 and will not be centred exactly in the middle.
Standard UHV windows: CF40, CF63, CF100
Please note:
For an effective and fast overview, all coatings here or in our LOOP are given for standard substrate materials (mostly Fused Silica or CaF2).
For quotations for coatings on glass cells or UHV windows we have to know:
• allowed maximum temperature
• glass material (mostly Fused Silica, Kodial or Sapphire)
• size
Every AR coating can be adapted to each substrate type. Please choose the best matching coating and ask us for a quotation with an optimized one.
