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Architecture: Overview
- Beam Path
- CAD Design
- Optical Bench Photos
Beam Path
Schematic diagram of ShaneAO beam path.
The beam path from the Shane telescope is as follows:
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Folding mirror (Fold 1 Rx, Fold 1 Ry).
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Deployable/retractable: Calibration stage (Cal X, Cal Y).
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Fixed off-axis parabola 1 (OAP1).
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ALPAO deformable (woofer) mirror.
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Fixed off-axis parabola 2 (OAP2).
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Tip-Tilt dichroic (splitter) or mirror (TT Dichroic).
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If tip-tilt (splitter) selected, some fraction of
visible light is relayed via a fixed periscope and
tip-tilt filter wheel to the tip-tilt camera, mounted
on an x-y stage (TT Cam X, TT Cam Y).
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Fixed off-axis parabola 3 (OAP3)
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MEMS deformable (tweeter) mirror.
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Wave Front Sensor dichroic directs visible wavelengths to Wave Front
sensor(s) via:
- Steering mirrors (WFS steer 1 Rx,
WFS steer 1 Ry,
WFS steer 2 Rx,
WFS steer 2 Rx).
- Lenslet array (Lenslet).
- Focussing mechanism (WFS focus.
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Infra-red wavelengths continue to fixed, off-axis parabola 4 (OAP4).
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Fixed flat mirror.
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ShARCS entrance aperture. Within the cryogenic part of ShARCS are 3
mechanical systems:
- Filter Wheel 1 (Filter #1).
- Filter Wheel 2 (Filter #2).
- Aperture Wheel (Aperture).
CAD Design
CAD diagram of ShaneAO optical bench.
Optical Bench Photos
View of the ShaneAO optical bench from side. The horizontal black structure,
part of the support frame, obscures the view of some components (e.g. OAP1).
Credit: P. Lynam 2018-11-10. NOTE: The WFS assembly in the lower-left
portion is the pre-2019/2020 upgrade version.
Alternate view of the ShaneAO optical bench from side.
Credit: P. Lynam 2018-11-10.
View of the ShaneAO optical bench from above.
Credit: P. Lynam 2018-11-10.
View of the ShaneAO Wave Front Sensor stage upgraded 2019/2020.
Credit: P. Lynam 2020-11-18.
Change Log:
- 2020-11-18: Added upgraded WFS stage.
- 2018-11-26: First version.
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