Axicon Centering Station

OPG has stopped offering a centering station using a rotary table to establish an axis in space to which to align optical system. Rather we now offer a centering station that uses an Axicon grating to create the axis.


Featured Products

Point Source Microscope

Point Source Microscope

PSM Point Source Microscope

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MicroFinish Topographer

MicroFinish Topographer

Universal Surface Roughness Measurement

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Centering Station for PSM

Centering Station for PSM

Centering Station for PSM Point Source Microscope

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New Products

Right Angle Adapter Accessory for PSM

Right Angle Adapter Accessory for PSM

The Right Angle Adapter (RAA) is an attachment for the Point Source Microscope (PSM) that adds flexibility to the PSM by allowing the objective to be attached at right angles to the axis of the PSM.


Set of 10 balls for use with the PSM

Set of 10 balls for use with the PSM

Precision balls for use with the PSM for alignment and assembly of optical systems.




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KLA-Tencor, Milpitas, CA

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A Contemporary Version of the Autostigmatic Microscope and Its Uses


What is an autostigmatic microscope (ASM)

Measuring the radius of curvature of a concave surface
– Main historical use

Modern version of an ASM uses internal infinite conjugate optics

Use of an ASM for alignment of optical systems

Other uses of an ASM


View Presentation




    "Measuring the four paraxial lens parameters using an autostigmatic microscope"





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Conferences and Exhibitions

  • Optical Perspectives will be at Photonics West

    February 5-7, 2019
    The Moscone Center in San Francisco, California, USA
    Optical Support Booth #124


Case Studies & Testimonials

  • How small can the PSM be used for centering on a cylindrical axis?

    The PSM is an ideal tool for finding the center of curvature of a ball or the axis of a cylinder. The question is for how small a ball or cylinder can the PSM do this?

    The smallest article that was readily available was a piece of monofilament 8 pound test fishing line that was 290 μm in diameter. There was no problem finding the axis of the fishline, and separating the Cat’s eye reflection from the surface from the confocal reflection of the axis. The experiment was done with a 5x objective, and the result would have been even more definitive using a 10x objective.

  • Why is proper alignment so important?

    Here is a case of a very happy customer due to better optics.

    A few days ago an astronomer friend of mine commented that he had gotten the optics of his telescope improved and the improvement reduced the time it took to get data by a factor of 3. For an astronomer this is a dramatic improvement since observing time on large telescopes can cost thousands of dollars an hour.

    My friend did not say how the optics had been improved, but the important point is that better optics, whether due to figure errors, mounting or alignment mean more productive optics. I generally think of better optics as a better product leaving the manufacturing facility without thinking about how much the better optics mean to the productivity of the customer.

OPG Customers