Magnetorheological Finishing (MRF) Polish Smarter. Polish Better




MRF polishing, exclusively available from QED is flexible and fast, reliable and accurate — polish optics to satisfy customers like never before.

With an MRF machine on your shop floor, you can polish an optical surface to pristine form, figure, and finish, regardless of symmetry, geometry, or slope variation. Our family of MRF systems offers many advantages that eliminate the inherent problems of classical polishing.



MRF Polishing brings precision, determinism and repeatability to precision optics manufacturing.

  • Provides a completely deterministic process that can be characterized to very high precision.
  • Conforms to complex surfaces, providing the flexibility to polish aspheric and full freeform shapes.
  • Significantly reduces cycle times due to its high rate of removal.
  • Maintains process stability.
  • Provides an affordable, turnkey system for precision optics manufacturing that will broaden your design options and enhance your cost effectiveness.
  • Spherical Lenses, Aspheric Lenses, Prisms, Freeforms and More

QED's MRF computer-controlled polishing systems deterministically produce better, faster, and cheaper high-precision optics.
MRF systems have revolutionized the way optics are being made.

Unparalleled Accuracy and Repeatability:

  • Obtain high-precision surfaces (lambda/50)
  • Correction of transmitted wavefront (windows, phase plates, entire system correction on one surface)
  • Optical glasses, single crystals (calcium fluoride, silicon…) and ceramics
  • Square and rectangular aperture surfaces such as prisms, cylinders, and photoblank substrates
  • Mild & wild aspheres, cylinders and freeforms
  • High-aspect-ratio optics and substrates (thin film filters, etalon substrates, semiconductor wafers etc.)

MRF does what many people in the optics business used to consider impossible: A turnkey system able to polish precision optics repeatably, fast.

MRF can make surfaces:
    1. Extremely flat,
    2. Extremely spherical, aspherical, cylindrical or any other mathematically defined shape,
    3. Extremely uniform in thickness (important for silicon-on-insulator semiconductor wafer applications) or optical thickness

MRF can also improve the surface integrity by:
    1. Removing micro-cracks and subsurface damage,
    2. Removing residual stresses, and
    3. Improving glass resistance to laser damage



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MRF machines are fast, flexible and accurate. Polish optics like never before.


MRF accomplishes what used to be considered impossible: a turnkey system able to polish precision optics fast and repeatably.


MRF improves form and figure, roughness, surface integrity and more.


Stable, high performance fluids are at the heart of the MRF process.