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Tagged with: Mid-spatial frequency roughness

Specifications: Figure and Finish are not Enough (ABSTRACT)

ABSTRACT: A paper that shows why simply specifying figure and rms surface roughness is not enough information to assure a finished optic will perform as expected. Mid-spatial frequency roughness must also be specified. There are examples using the PSM to show the effects of mid-spatial frequency roughness, and examples of using the structure function to characterize mid-spatial frequency roughness.

Super-Smooth Optical Fabrication Controlling High Spatial Frequency Surface Irregularity (ABSTRACT)

ABSTRACT: A paper by Del Hoyo, et. al., showing how the MicroFinish Topographer (MFT) was used for in process control assessment of the removal of high spatial frequency polishing errors during polishing as a function of type of polishing compound and polishing pad. The MFT was particularly useful for determining when a surface was fully polished out, that is, had no defects left from previous steps in the lapping and polishing process.

Use of the Surface PSD to Investigate Near Specular Scatter from Smooth Surfaces (ABSTRACT)

ABSTRACT: A paper by Talabaly, et. al., showing that a low magnification objective on the MicroFinish Topographer (MFT) can measure surface roughness in a spatial frequency domain that is so close to specular that it is not possible to make a similar measurement with a scatterometer. This makes it possible to predict a valid near specular BRDF that is functionally not measureable, particularly if the substrate material scatters.

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.

Worldwide Representatives

FOR SALES IN CHINA PLEASE CONTACT:

FOR SALES IN CHINA PLEASE CONTACT:
OPTurn Company Ltd
R607, Yingzhi Building, 49-3 Suzhoujie Str.
Beijing, China
+86-10 62527842
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FOR SALES IN ALL OTHER ASIAN COUNTRIES PLEASE CONTACT:

FOR SALES IN ALL OTHER ASIAN COUNTRIES PLEASE CONTACT:

上原 賢司   Kenji Uehara
清原光学 営業部   Kiyohara Optics / Sales
+81.80.6600.6702
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Kiyohara Optics Inc.
3-28-10 Funado Itabashi-Ku Tokyo, Japan 174-0041

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