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    • QED Technologies Inc

    Rochester, NY 14607

    COMPANY OVERVIEW

    About QED Technologies Inc

    45

    Contact

    1040 University Ave
    Rochester, NY 14607
    United States
    http://www.qedmrf.com
    585-256-6540

    More Info on QED Technologies Inc

    QED Technologies provides MRF polishing and SSI metrology systems to precision optics manufacturers worldwide, as well as contract precision optics manufacturing services through its division, QED Optics. www.qedmrf.com, www.qedoptics.com

    Articles

    FIGURE 1. Shown are MRF slurry delivery (a) and MRF plunging into fluid for removal (b).
    Optics & Design

    Optical Fabrication: Magnetorheological finishing is pushed to new extremes

    William Messner
    With the development of a 10 mm wheel, the concave radius limit of magnetorheological finishing (MRF) technology has been extended to new lows.
    FIGURE 1. A diagram of rigid-body motions shows the six possible degrees of freedom. For rotationally symmetric parts, the axis of symmetry is assumed to be along the Z axis.
    Optics

    Aspheres: Removing alignment errors from measurements of spherical, aspheric, and freeform optics

    Paul Murphy
    Optical surface measurements include alignment error from rigid-body position uncertainty; challenges exist when fitting such errors on aspheres and freeforms.
    FIGURE 1. A 3D plot shows departure from the best-fit sphere of the example freeform optic.
    Optics

    Aspheres: Subaperture stitching interferometry enhances advanced freeform optics

    Chris Supranowitz
    Freeform fabrication technology has advanced considerably with improved diamond turning, grinding, and polishing machines. Freeform surface testing, however, remains a significant...
    FIGURE 1. Measured fringes of incoming sphere for a freeform optic are compared to the target fringes.
    Optics

    Novel Optics: Advances in MRF enable better mid-spatial frequency correction on precision optics

    New magnetorheological finishing (MRF) techniques can correct figure error down to ~1 nm RMS, mid-spatial frequency errors as small as ~1 mm, and a final surface roughness of ...
    (Courtesy of Zygo)
    FIGURE 1. Data from different zones of an aspheric surface measured by a Verifire Asphere interferometer are combined in software to obtain the optic's shape.
    Test & Measurement

    Photonics Products: Interferometers: Numerous ways exist to interferometrically measure aspheres

    John Wallace
    Aspheric optics can be measured using a Fizeau interferometer, or by using an optical profiler containing an interferometer; both approaches have a variety of forms.
    (Courtesy of QED)
    FIGURE 1. Magnetorheological (MR) fluid is discharged to a rotating wheel (left). In the presence of a magnetic field, iron particles align and abrasive particles concentrate at the surface of the fluid 'ribbon' (center). The work piece is immersed in the ribbon to generate material removal (right).
    Optics

    Optical Fabrication Materials: New MRF fluid focuses in on 1 Å roughness

    A new magnetorheological finishing (MRF) fluid has been designed to achieve ultralow roughness on a variety of optical materials and surface geometries. C30 was developed to address...
    FIGURE 1. QIS modulation is independent of fringe density, allowing for more robust data acquisition at high fringe densities and acquisition at a higher percent of Nyquist. Here, modulation vs. fringe density is shown for a standard interferometer and QIS.
    Test & Measurement

    PHOTONICS APPLIED: METROLOGY: Stitching interferometers: Direct imaging aids asphere metrology

    Chris Bond
    The QIS, a coherent imaging Fizeau interferometer, has been developed to measure high fringe densities for non-null, aspheric stitching interferometry.
    Greg Forbes, QED Technologies
    Home

    QED’s Greg Forbes awarded OSA's David Richardson Medal

    Rochester, NY--The Optical Society of America (OSA) has named Greg Forbes of QED Technologies as the 2012 recipient of the David Richardson Medal for his contributions in aberration...
    (Courtesy of QED Technologies)
    A miniature MRF polishing head with an improved fluid-delivery system is small enough to fit on an end table. The polishing wheel is at the top; the ribbon of MR fluid is held on the wheel’s rim.
    Optics

    OPTICAL FABRICATION: Miniature MRF machine can use novel polishing fluids, has new uses

    John Wallace
    Magnetorheological finishing is an optical-fabrication technique whose name is synonymous with QED Technologies and with good reason: MRF, invented in the former Soviet Union ...
    (Courtesy of QED Technologies)
    FIGURE 1. Two counter-rotating optical wedges (a and b) are at the heart of a VON assembly (c). The relative angular position of the wedges can be changed, and the wedges can be tilted as a unit, to introduce varying amounts of astigmatism and coma.
    Optics

    ASPHERES: Variable optical null advances asphere metrology

    Removing astigmatism and coma with a variable optical null allows an aspheric stitching interferometer to measure surfaces with departures up to 1000 waves from the best-fit sphere...

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    Additional content from QED Technologies Inc

    Software

    Optical Research Associates and QED Technologies announce cooperative agreement

    John Wallace
    Optical Research Associates and QED Technologies are creating a complete design, tolerancing, and manufacturing process for lens systems that include aspheric surfaces.
    Optics

    Asphere specialist QED Technologies gets new president

    John Wallace
    Andrew Kulawiec, who has an extensive background in precision optics, is the new president of QED Technologies.
    (Courtesy of Veeco)
    FIGURE 1. Veeco's NPFlex white-light interferometer provides noncontact 3-D areal surface characterization with subnanometer vertical resolution at every pixel for large samples, designed to complement measurements made with a CMM tool.
    Test & Measurement

    PRODUCT FOCUS: INTERFEROMETERS: What to look for in interferometer systems

    Valerie Coffey-Rosich
    While numerous interferometry applications have made only small advances over the years, big leaps have occurred in vibration isolation and form measurement of aspheres.
    FIGURE 1. When testing spherical optics, a null is easily achieved using standard reference optics (left). Testing an asphere in the same setup, however, results in a non-null test wavefront (center). The addition of auxiliary optics, which correct for the (nominal) aspheric portion of the test wavefront, produces a null (right).
    Optics

    NULL OPTICS: Approaches to aspheric metrology become more diverse

    Null optics allow mild to strong aspheres to be interferometrically tested. As an alternative, subaperture-stitching interferometry measures mild to moderate aspheric surfaces...
    (Courtesy of QED Technologies)
    A single-point-diamond-turned asphere is polished via MRF (magnetorheological finishing). A new shape specification for axially symmetric aspheric surfaces promises to make optical design and fabrication of aspheres more straightforward.
    Optics

    OPTICAL DESIGN: New shape specification eases design and fabrication of aspheres

    John Wallace
    The capabilities that well-designed aspheric lens surfaces can bring to optical systems are dramatic, from the simplification of objective lenses for CD and DVD drives to larger...
    FIGURE 1. Aspheric subaperture-stitching interferometry can be used to measure the surface figures of aspheres such as this ellipsoid (conic), which has a 100 mm aperture diameter, a base radius of -226 mm, and approximately 12 µm of aspheric departure. The asphere is fabricated from lightweighted silicon carbide with silicon cladding.
    Optics

    ASPHERIC OPTICS: Distributing aspheric surfaces brings down cost

    Greg Forbes
    Distributed, mild aspheric surfaces and subaperture-stitching interferometry combine to form a cost-effective approach to fabricating aspheric optics.