Optische Systeme
-
Ansprechpartner
- News
- Downloads
- Termine
- Kontakt
Computergenerierte Hologramme
(Computer Generated Holograms)
Computer Generated Holograms (CGH) that convert the wavefront of the test specimen to an aspherical wavefront extend the testing options for traditional Fizeau interferometers for complex surfaces. In the measurement setup, a Computer Generated Hologram is to be situated between the transmission sphere and the object being measured. The distance from the transmission sphere should be relatively short in order to use the full aperture of the lens. The diffraction of the hologram adapts the spherical test wave of the objective lens to the aspherical geometry of the test lens.
The Optical Systems Division manufactures Computer Generated Holograms specially tailored to the measurement setup. The Holograms are produced through a rapid and efficient microlithographic process. The individual design of a CGH test setup follows a customer oriented consultancy service, which is necessary because not all aspherical shapes can be measured with Computer Generated Holograms.
For measurable aspheres the test setup is optimized to meet the customer’s requirements.
The CGH is designed so that reflections in the setup are excluded as far as possible. An annular alignment structure arranged around the working structure serves to position the Computer-Generated Hologram precisely in the interferometer. The calibration structure is available in specialized formats in the CGH layout. A standardized holder for the 6-inch substrate has proven to be most useful in practice. The holder can also be tailored to meet special customer requirements.
Jenoptik manufactures customized Computer Generated Holograms. All the production processes have been standardized to allow individual holograms to be produced quickly.
Features:
- Aspheric wavefront generation
- Accurate binary phase gratings
- Clear aperture up to 150 mm
Test setups
Applications
- Interferometric test of optics
- Diffractive Aspheric Lenses