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Development and Testing of Mirror Support Prototypes for Precision Optical Systems

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This report outlines the development and testing of mirror support prototypes designed for high-precision optical applications. The study details the shipment of dummy segments for shaping and drilling at CERN, focusing on two innovative designs: the leaf spring and single dowel prototypes. Each design allows for controlled movement of mirrors around specified axes, utilizing piezo motors and aluminum ribbons for precision. Measurements demonstrate effective alignment, minimal deviation, and the potential for advanced stabilization in optical setups. Two encoders and additional mirror components have been ordered for further testing.

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Development and Testing of Mirror Support Prototypes for Precision Optical Systems

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  1. Test on mirrorsupportprototypes M. Lenti

  2. News from MARCON • Shipping at CERN ofall the mirrors: end of 2010 – beginningof 2011 • 4 dummysegmentsorderedtobeshaped and drilledas the mirrors (withoutanyopticalthreatment) forourtesting M.Lenti

  3. Encoders NANOS InstrumentsGmbH EncodersdevelopedforPiezoMotor Twopiecesordered M.Lenti

  4. Leaf Springs piezo • Full prototyperealized • “leafsprings”: mirrorhungthroughtwoholes • Mirrormovementaround x and y axis • pulled at 0 and 90 degrees • Mirrorweight: counterbalanceforverticalmovement • Leafsprings: counterbalanceforhorizontalmovement • Piezo-motor (final) used • 0.25 mm thickaluminiumribbon (directtraction, no 90 degdeviation); l=250mm piezo dowel dowel dowels Leafsprings piezo dowel M.Lenti

  5. LeafSpringPrototype • For the horizontal plane (actuated by the leaf spring) the "zero" with the ribbon mounted was with a 12 mrad angle deviation with respect to the "free" situation(no horiz ribbon fixed). • I measured this both from the displacement at the ribbon fixation point and from the displacement of the laser spot on the photodiode. • The force to be exerted to bring all the stuff in the horiz. "zero" position is 60 g (or 0.6 N) measured with a dynamometer; the force is roughly linear with the observed displacement of the laser spot on the photodiode. • Use both an aluminum hexagon and a true glass mirror (pre-series mirror are with two holes in the back, lacking the central one) • Reduce step size by a factor 5 w.r.t. last meeting M.Lenti

  6. LeafSpringPrototype Fromonepointto the next: 20 microstepmovementsof the Piezo (6.25 μm) Aluminumhexagon Glass mirror Spot position on the Photodiode 65 μm 65 μm 50μrad 50μrad 50μrad 50μrad Aluminumhexagon dist. Mirror-phtdiode: 700 mm Glass Mirror Dist. Mirror-phtdiode: 770 mm M.Lenti

  7. Single DowelPrototype • Put the actuating ribbons “parallel” • “twist” the actuating ribbons (90 degree from the segment to the piezo) • Use a third ribbon for θZstabilization • Reduce stepsizeby a factor 5 M.Lenti

  8. Single dowel piezo piezo • Full prototyperealized • “single dowel”: mirrorhung at the center • Mirrormovementaround u and v axis (insteadof x and y) • pulled at ±45 degrees (axisdecoupling) • Mirrorweight: counterbalanceforbothmovements • Piezo-motor (final) used • 0.25 mm thickaluminiumribbon (directtraction, no 90 degdeviation), 13 mm wide dowel dowel stabilizer piezo dowel M.Lenti

  9. Ribbons are parallel Twistedribbon Twistedribbon Single Dowel The stabilizerribbonisfixed on the bottom corner of the Hexagon and at 500 mm on the right (availablealso on the left butnotused) Actuatingribbonsjoints on the Hexagonmadehorizontalusing a level fixed free fixed θZstabilizer θZstabilizer θZstabilizer M.Lenti

  10. Single dowelprototype Fromonepointto the next: 20 microstepmovementsof the Piezo (6.25 μm) Piezoribbon joint on the hexagon: 300 mm from the dowel 6.25 μm/300 mm = 21μrad 16.11.2010 17.11.2010 Aluminumhexagon 65 μm 65 μm 50μrad 50μrad 50μrad 50μrad Spot position on the Photodiode Aluminumhexagon: dist. Mirror-phtdiode: 700 mm 40 μm on the photodiode 0.5*40 μm/700 mm = 28 μrad M.Lenti

  11. Conclusions • Bothapproaches (leafsprings and single dowel) tested • Twoencodersordered • 4 Dummyglassmirrorsordered M.Lenti

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