Transcript NGAO 1-tier optical relay.ppt

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
- D-IFS & LOWFS at NIRC2 location
D-IFS / LOWFS
OAP1
at 12.8 km conjugate
OAP2
DM (woofer)
150” Field to 2nd Relay
(150” dia field of view)
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
NGS
WFS
DM
(tweeter)
OAP4
2.2 m
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
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
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
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
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)
LGS WFS & LGS ACAM
Focal plane for 90 km LGS
Folds beam vertically
1. Na Reflective Dichroic
transmits > 650 nm
2. Open for NGS science (option)
NGS Acquisition Camera Fold
(150” dia field of view)
Option 1. Horizontal (or vertical) Fold
Option 2. Vertical Fold
Alignment, Calibration & Diagnostics
(150” dia field of view)
Telescope
Simulator
Fold
(option 1 is
vertical)
TS
Option 3
TS
Option 2
Pop-up mirror to
DM interferometer