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NGAO 1-tier Draft Optical Relay Design

NGAO 1-tier Draft Optical Relay Design. P. Wizinowich 12/7/07. D-IFS / LOWFS Focal Plane (150” dia field of view). Very similar to existing Keck AO optical relay: Image rotator larger Same OAPs (but larger diameter) Same pupil size on DM Same opening angle to DM

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NGAO 1-tier Draft Optical Relay Design

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  1. NGAO 1-tier DraftOptical Relay Design P. Wizinowich 12/7/07

  2. D-IFS / LOWFS Focal Plane(150” dia field of view) • Very similar to existing Keck AO optical relay: • Image rotator larger • Same OAPs (but larger diameter) • Same pupil size on DM • Same opening angle to DM • D-IFS & LOWFS at NIRC2 location D-IFS / LOWFS DM (woofer) OAP1 at 12.8 km conjugate OAP2

  3. 150” Field to 2nd Relay(150” dia field of view)

  4. NGS WFS Focal Plane(30” dia field of view) 1. Mirror for NGS AO narrow field science 2. Open for d-IFS LGS AO science 3. JH transmissive, K-band reflective 4. JH transmissive, visible reflective 5. J transmissive, H-band reflective 6. H transmissive, < H-band reflective 2.3 m OAP3 FSMs DM (tweeter) NGS WFS OAP4 2.2 m

  5. NIR Camera Focal Plane(30” dia field of view) 1. Mirror for LGS science For NGS science: 2. JHK reflective, visible transmissive 3. IJHK reflective, visible transmissive 4. Open NIR Camera

  6. Visible Camera Focal Plane(30” dia field of view) 1. Open for NIR science 2. Mirror for Vis science 3. I reflective, JHK transmissive dichroic for simultaneous Vis/NIR (option) Visible Camera

  7. OSIRIS Focal Plane(30” dia field of view) OSIRIS position and optical relay same as for existing AO system. OSIRIS (or DSM) 1. Open 2. K reflective, < K transmissive 3. H reflective, < H transmissive 4. J reflective, < & > J transmissive

  8. Collimated Beam to Interferometer Dual Star Module (30” dia field of view) DSM position and optical relay same as for existing AO system. DSM 1. Open 2. JHK reflective, < J transmissive

  9. LGS WFS Focal Plane(150” dia field of view, LGS at 90 km) Fold Mirror Folds beam horizontal 400 mm above 1st Relay OAP2b (optimized for LGS) Folds beam vertically 1. Na Reflective Dichroic transmits > 650 nm 2. Open for NGS science (option) LGS WFS & LGS ACAM Focal plane for 90 km LGS

  10. NGS Acquisition Camera Fold(150” dia field of view) Option 1. Horizontal (or vertical) Fold Option 2. Vertical Fold

  11. Alignment, Calibration & Diagnostics(150” dia field of view) TS Option 2 Telescope Simulator Fold (option 1 is vertical) Pop-up mirror to DM interferometer TS Option 3

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