1. NGAO 1-tier Draft Optical Relay Design P. Wizinowich 12/3/07

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 OAP1 at 12.8 km conjugate OAP2 DM (woofer) D-IFS / LOWFS

3. 150” Field to 2 nd 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 OAP3 OAP4 DM (tweeter) NGS WFS

5. NIR Camera Focal Plane (30” dia field of view) NIR Camera 1. JHK reflective, visible transmissive 2. Mirror for LGS NIR science (option) 3. Open for Visible science (option)

6. Visible Camera Focal Plane (30” dia field of view) Visible Camera 1. Open for NGS NIR science 2. Mirror for LGS Vis science 3. I transmissive dichroic for NGS Vis science (option)

7. OSIRIS Focal Plane (30” dia field of view) OSIRIS (or DSM) 1. Open 2. K reflective, < K transmissive 3. H reflective, < H transmissive 4. J reflective, J transmissive

8. LGS WFS Focal Plane (150” dia field of view, LGS at 90 km) Mirror folds beam vertically to LGS WFS Focal plane 475 (180 km) to 600 mm (90 km) from mirror Option of LGS ACAM above fold 1. Na Reflective Dichroic transmits > 650 nm 2. Open for NGS science (option) OAP2b (optimized for LGS)

9. LGS WFS Focal Plane (150” dia field of view, LGS at 90 km) With d-IFS & narrow field beams overlaid

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