Accessories for interferometric asphere testing

System solutions and measurement technology accessories for computer-generated holograms

In addition to our computer-generated holograms (CGH) for the interferometric inspection of aspheres, we offer opto-mechanical accessories that enable a simpler CGH and asphere alignment.

We adapt ourselves to your laboratory environment and find the right solution. We connect your possibilities and your equipment with our CGHs and our accessories. We develop your measuring concept and implement it for you.

To achieve this, we do everything we can so that our diffractive optics can be used directly in every structure and you can immediately obtain testing results. The installation of the CGHs can take place in your measurement environment and be set up by our experts. We would also be happy to train your staff on how to carry out the measurements themselves. In addition to all common mounts for your interferometer, we also deliver comprehensive solutions for the alignment of CGHs and test objects.

For advice, contact: Frank Weidner | Tel.: +49 6201 65040-17

↓ Alignment aids
↓ Transmission Flats
↓ CGH Mounts

Alignment aids


CGH adjuster: Simplified CGH alignment

The purpose of the CGH adjuster is to make the alignment of our diffractive null lenses (DNL) easier and more precise. The CGH adjuster accepts both the CGH and the transmission sphere to be used and is mounted in the standard bayonet mount of the interferometer. Using a micrometer head in three independent spatial axes, the CGH is moved precisely in a gimballed tilt in two axes.  In this way, the alignment process can be accelerated significantly.

  • Independent motion control of x, y, z, theta, phi axes
  • Quick and easy CGH alignment in horizontal and vertical setups
  • Variable distance betweentransmission sphere and CGH
Specifications und Downloads
Interferometer mount 4” and 6” standard bayonet mount
Maximum distance between CGH and transmission sphere 500 mm
Maximum CGH diameter 150mm
X-Y fine adjustment ±3.5 mm
Z fine adjustment ±10 mm
Tilt adjustment ±2°
Angular sensitivity 15 arcsec
Lateral and vertical sensitivity 5 µm
Data sheet Download

For advice, contact: Dr. Frank Weidner | Tel.: +49 6201 65040-17


optomechanical setup for alignment of aspheres

Asphere adjuster: Simplified asphere alignment

Using our asphere alignment fixture, the lens under test is precisely tilted around the center of vertex curvature in two axes. This ensures that observed coma errors during the alignment are eliminated without being superimposed by fringes in the interferogram.

Specifications und Downloads
Tilt adjustment ±1°
Angular sensitivity 4 arcsec (=4µm)
Maximum asphere diameter Concave: 78 mm
Convex: 200 mm
Asphere fixture HD-12, HD-25 oder customer specific
Data sheet Download

For advice, contact: Dr. Frank Weidner | Tel.: +49 6201 65040-17


DIOPTIC Transmission Flats

Interferometer transmission flats are used to measure the surface quality of flat surfaces. DIOPTICS’s transmission flats attach conveniently to any Interferometer with the standard bayonet mount. All transmission flats are supplied with a certificate of the surface quality.

Specifications and downloads
Size 4″, 6″, 8″, 12″, 18″
Other diameters on request
Interferometer mount Standard bayonet mount or customer specific
Surface quality λ/10, λ/20
Data sheet
For advice, contact: Dr. Frank Weidner | Tel.: +49 6201 65040-17


CGH Mounts


Standard CGH Bajonet Mount

Our CGHs are delivered with a bayonet mount as standard. This allows the CGHs to be easily attached to most Fizeau interferometers.

Specifications and downloads
Size 4″ or 6″
Interferometer Mount 4″ oder 6″ standard bayonet mount

For advice, contact: Dr. Frank Weidner | Tel.: +49 6201 65040-17


Rotatable CGH Mount

The rotatable CGH mount allows the CGH to rotate 360° even after it has been attached to the interferometer. This is especially useful for measuring aspheres, cylinders and other free-form surfaces. As standard, all our asymmetric CGHs for testing off-axis aspheres, cylinders and freeform surfaces are mounted into a rotatable CGH mount.

Specifications and downloads
Size 4″ or 6″
Interferometer Mount 4″ or 6″ standard bayonet mount
Angular adjustment 360°
Angular sensitivity
Data sheet

For advice, contact: Dr. Frank Weidner | Tel.: +49 6201 65040-17


Rotatable CGH mount with fine adjustment

With the help of our precision adjustable rotation mount for CGHs, the rough adjustment can be done 360°. As with the standard rotation mount, the rough adjustment can be done after the CGH has been attached to the interferometer. The high-precision fine adjustment takes place in a range of ±2°.

Specifications and downloads
Size 4″ or 6″
Interferometer Mount 4″ or 6″ standard bayonet mount
Angular adjustment 360°
Angular fine adjustment ±2°
Angular sensitivity (fine adjustment) 5 arcsec
Data sheet

For advice, contact: Dr. Frank Weidner | Tel.: +49 6201 65040-17