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M. Johansen N.C.R. Holme P.G. Dinesen J. B. Rasmussen Kaleido-Technology a/s

Design and realization of components based on free-form optical elements. M. Johansen N.C.R. Holme P.G. Dinesen J. B. Rasmussen Kaleido-Technology a/s. Outline. Design and realization of components based on free-form optical elements. Motivation Design Manufacturing Testing Conclusion.

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M. Johansen N.C.R. Holme P.G. Dinesen J. B. Rasmussen Kaleido-Technology a/s

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  1. Design and realization of components based on free-form optical elements M. Johansen N.C.R. Holme P.G. Dinesen J. B. Rasmussen Kaleido-Technology a/s

  2. Outline Design and realization of components based on free-form optical elements • Motivation • Design • Manufacturing • Testing • Conclusion

  3. Motivation • Freeform optics lead to • More degrees of freedom • Reduced number of elements • Simplified assembly

  4. Design • Astigmatic lens: • Replace spherical+cylindrical • Replace two cylindrical

  5. Design II • Ray-tracing • z = a x2+ b y2

  6. From Design to Fabrication • Software conversion from Zemax design file to nc-tool-path program • 3d cad program used for verification

  7. Manufacturing • Moore Nanotechnology Systems FG-350: • Grinding and diamond-turning capabilities • Tool : R=0.5 mm, 0 rake, non-controlled • X-Z-C programming inverse time • Target values • Roughness ~ 10 nm • Waviness ~ 

  8. Metrology I • Free-form measurements:

  9. Optical testing I • Optical test setup • Fit with double gauss

  10. Optical testing II

  11. Conclusion • Compensation of astigmatism by the use of a single free-form lens • Simple 3d-freeform metrology using on-machine “2d-software”

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