Difrotec has developed a breakthrough technology in optical testing
The D7 is phase-shifting point diffraction common path interferometer for ultra high accuracy
measurements of surface form and transmitted wavefront quality.
The D7 detects the absolute figure of a surface or wavefront. See video
Absolute figure means that the measured form is counted from the absolute reference i.e. perfect spherical wavefront produced by diffraction of light by a sub-wavelength aperture.
Look at our latest product information:
Difrotec_products&services.pdf
Interferometer D7 dimensions:
Performance:
Peak-to-valley absolute accuracy: ± 0.6 nm (λ/1000)
Peak-to-valley resolution: 0.05 nm (λ/12000)
Wavefront RMS repeatability: < 0.23 nm (λ/2800)
Simple RMS repeatability: < 0.06 nm (λ/10500)
Laser type and wavelength: stabilized He-Ne, 632.8 nm
Data acquisition: phase-shifting interferometry (PSI)
Measurement schemes
2. Spherical convex surfaces:
3. Flat surfaces:
4. Optical systems (wavefront quality testing):
optical testing & Measurements
Optical testing and measurement services include testing surface figure of concave, convex, corner cubes, flat, aspheres, freeforms, and transmitted wavefronts of optical systems, and also measurements of curvature radius. (test your optics)
