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NFIRAOS Optics PD Kickoff Meeting

NFIRAOS Optics PD Kickoff Meeting. Jenny Atwood August 23, 2007. Outline. NFIRAOS Requirements What’s New in NFIRAOS Current State of Affairs Looking Forward. Requirements Summary. Science wavelength range is 1.0 - 2.5 um NFIRAOS will work down to 0.8 um with reduced performance

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NFIRAOS Optics PD Kickoff Meeting

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  1. NFIRAOS OpticsPD Kickoff Meeting Jenny Atwood August 23, 2007 TMT.AOS.PRE.07.019.DRF01

  2. Outline • NFIRAOS Requirements • What’s New in NFIRAOS • Current State of Affairs • Looking Forward TMT.AOS.PRE.07.019.DRF01

  3. Requirements Summary • Science wavelength range is 1.0 - 2.5 um • NFIRAOS will work down to 0.8 um with reduced performance • WFS wavelength range is 0.589, 0.6 - 1.0 um • NFIRAOS FOV is 2 arcmin • 6 LGS will be arranged with a central star and five in a 35” radius pentagon • Optical design will support an upgrade with WFE (including telescope and instrument) < 133 nm RMS • Operating temperature is -30 deg C • DM conjugate altitudes are 12 km and 0 km TMT.AOS.PRE.07.019.DRF01

  4. What’s New in NFIRAOS • Science Optics • Field Curvature due to RC telescope design • Laser Guide Star Optics • New design for easier manufacturability and lower cost • Visible Wavefront Sensors’ Optics • Additional WFS (MOR) • Added ADC • Acquisition Camera Optics • Moved to new location due to wavelength change • Calibration/Artificial Source Optics • No change • Turbulence Simulator Optics • No change TMT.AOS.PRE.07.019.DRF01

  5. Opto-mechanical Concept Overview LGS Sources Downward Fold From telescope Acq. Camera From telescope OAP2 WFSs NGS Sources LGS/NGS B/S Instrument input Instrument fold mirror OAP2 Sci B/S DMs DMs • Red path is the science beam and the acquisition camera • Green path is the visible WFSs • Yellow path is the LGS and calibration sources OAP1 OAP2 TMT.AOS.PRE.07.019.DRF01

  6. Science Path Optics Instrument input OAP 2 Science Beam splitter DM0 OAP 1 DM12 Input focus TMT.AOS.PRE.07.019.DRF01

  7. Science Path WFE Gregorian Telescope Ritchey-Chretien Telescope Field pt: 1’, 0 RMS WFE: 22.6 nm Field pt: 0, 1’ RMS WFE: 27.4 nm Field pt: 1’, 0 RMS WFE: 18.6 nm Field pt: 0, 1’ RMS WFE: 36.0 nm Field pt: -1’, 0 RMS WFE: 22.5 nm Field pt: 0, -1’ RMS WFE: 50.0 nm Field pt: -1’, 0 RMS WFE: 18.7 nm Field pt: 0, -1’ RMS WFE: 45.1 nm Field curvature: 1300 mm R Field curvature: 8400 mm R TMT.AOS.PRE.07.019.DRF01

  8. LGS Focal Planes Telescope focus 235 km focus 85km focus TMT.AOS.PRE.07.019.DRF01

  9. CoDR LGS Design TMT.AOS.PRE.07.019.DRF01

  10. B C C’ A D D’ LGS Path Optics Science Beamsplitter LGS/NGS Beamsplitter DM0 OAP 2b DM12 OAP 1 LGS fixed optics LGS zoom optics TMT.AOS.PRE.07.019.DRF01

  11. LGS RMS WFE (nm) • RMS WFE in nm, Current design (CoDR design) • The requirement is < 100 nm • Uppermost model still needs work TMT.AOS.PRE.07.019.DRF01

  12. LGS DM-Pupil Mapping(% of 0.5 m subaperture) • DM-Pupil, in % of 0.5 m subaperture, Current design (CoDR design) • The requirement is < 5% RMS • Upper R/L model still needs work TMT.AOS.PRE.07.019.DRF01

  13. CoDR Visible WFS/Acq Camera TMT.AOS.PRE.07.019.DRF01

  14. PATROL FIELD FOLD MIRROR COLLIMATOR ADC NGS WFS HOL TRUTH FOCUSING LENS FOLD MIRROR PINHOLE BEAMSPLITTER SELECTOR MOR TRUTH Visible WFS Optics Visible is transmitted LGS/Vis Beam splitter OAP 2c LARGE GIMBAL MIRROR Gimbal mirrors Gimbal mirrors WFS barrel SMALL GIMBAL MIRROR TMT.AOS.PRE.07.019.DRF01

  15. Acquisition Camera Optics • Requirement: 80% encircled energy within 2” Instrument input DM12 DM0 Input to IR Acquisition Camera Instrument fold mirror TMT.AOS.PRE.07.019.DRF01

  16. Calibration Source Optics • Requirement: < 50 nm RMS WFE • Performance: 27 nm RMS WFE LGS sources To NFIRAOS Image plane for a given Na distance From telescope NGS source 85 km 130 km 235 km TMT.AOS.PRE.07.019.DRF01

  17. Turbulence Simulator Optics • Requirement: < 50 nm RMS WFE • Phase screens at 0.7 and 9.3 km conjugates • Simulation of NGS and LGS sources • Performance: 280 nm RMS WFE NGS sources only TMT.AOS.PRE.07.019.DRF01

  18. Looking Forward (PDR work) • Requirements Documentation and Revision • Visible WFSs draft exists • Acquisition Camera draft exists • LGS should be updated to TMT format • Calibration Sources may need updating • Turbulence Simulator may need updating • Design Tasks • LGS final iterations • NGS WFS for new detector • Acquisition Camera for IR wavelengths • Turbulence Simulator for size • Modeling Tasks • Tolerancing of all subsystems for manufacturing and for performance with AO feedback • Non-common path wavefront mapping • Pupil mis-registration maps • Numerous smaller tasks TMT.AOS.PRE.07.019.DRF01

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