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Precision Optics Design Review for Illumination Lens Mounting

This preliminary design review focuses on mounting an illumination lens and test plate with specific requirements for precision alignment, sensitivity adjustments, and interface design. The design concept includes counterweight supports, axial flexures, mirror adjuster access points, and slope analysis to ensure optimal performance.

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Precision Optics Design Review for Illumination Lens Mounting

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  1. Preliminary Design Review Katie Schwertz Optics 523 April 3, 2009

  2. Overview • Mounting an illumination lens and test plate into a single cell • Lens diameters = 16” • Material = Fused Silica Illumination Lens Test Plate

  3. Requirements Review • Test Plate • Concave surface: RMS slope error < 10 nm/cm (0.1 urad) • Alignment of lenses • 100 um position • 1 mrad angle • 10 mm nominal separation (100 um tolerance) • Adjustment of cell • 0.2 urad angular sensitivity • 0.15um translation sensitivity (along axis) • Coarse and fine adjustments • Interface • Access points needed at 3 points around cell for a feeler gauge measurement • Test plate will be 5 mm away from next surface • Cell will sit within another cell on rollerballs in kinematic grooves

  4. Interface 12 sets of kinematic grooves around diameter Piezoelectric stages will drive this cell from underneath (Z-direction) to obtain fine axial adjustments required

  5. Design Concept 3 counterweight supports 6 axial flexures Mirror adjuster/micrometer access points (3)

  6. Slope analysis: 6 point flexure RMS Slope Error = 1.35 nm/cm

  7. Flexure Properties Vukabratovich, pg. 145-146 Flexure Material: CRES 17-4

  8. Design Concept 3 counterweight supports 6 axial flexures Mirror adjuster/micrometer access points (3)

  9. Counterweight Vukabratovich, pg 297

  10. Flexure Positioning (1) • Apply moment to each flexure attachment point • See how much slope error is imparted onto the lens with a given angle

  11. Flexure Positioning (2)  • Adjust angle of flexures to determine optimal angle to mount flexures

  12. Action Items • Finish Solidworks models of interfaces and counterweights • Determine moment tolerance • Determine optimal angle of flexures • Determine thickness/stiffness of cell needed

  13. Appendix – Lens Drawings

  14. Appendix – Lens Drawings

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