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ZTF Filters: Substrates

This technical meeting focused on the procurement and performance of substrates and coatings for ZTF filters. Key discussions included thickness options, effects on focal distance, and necessary tolerances. The meeting outlined the expected costs and delivery timelines for three color filters, emphasizing the need for rigorous testing of wavefront errors and filter efficiency. Future tasks involve optical analysis of tolerances, mechanical analysis of substrates, and re-quoting for filters and substrates to ensure optimal performance standards are met.

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ZTF Filters: Substrates

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  1. 550 25.4 17.2 0 9.70 4.82 ZTF Filters: Substrates ZTF Technical Meeting 50.8 cm CA on 55cmsubstrate Plano Convex Thickness options • effects focal distance • TBD strength, mounting,flexure • TBD coating stress impact Type XIV Type IX

  2. ZTF Filters: Coatings ZTF Technical Meeting r’, g’, specified >95%, 1/4 l PP irregularity in 12cm aperture g’ throughput may be difficult to achieve Performance requirements TBR Throughput level (absolute) vs(averaged over band) Response uniformity over field (cone input varies by 2.5o)

  3. ZTF Filter Procurement ZTF Technical Meeting Substrates: ROM Cost by SESO Quantity three each = 2 color filters + 1 spare 150 - 200 k EUROS 12-14 month delivery Same for either thinner or thicker substrate.   Tolerances:   Irregular wave front error     1/2 l PP over any 120 mm diameter    GOAL Exceeds estimated spec of 1/4 l PP Coatings: ROM cost from JDSU • Quantity 2 each of g’, r’ filters • 152 k USD each filter + 38k USD NRE ( no quantity discount ) • 2 month delivery ARM, 4.5 month ARO

  4. ZTF Filter, Future Work ZTF Technical Meeting • To do: • Optical analysis of WFE tolerance (substrate + filter) • figure / dimensional tolerances • WFE spherical overall • WFE irregular aperture • Mechanical analysis of substrate / mounting • Establish minimum filter efficiency, uniformity & stability requirements • Re-quote filter & substrate

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