1. PALM-3000 P3K Stimulus Design Update Rick Burruss P3K Team Meeting #7 February 27, 2008

2. PALM-3000 Current Stimulus

3. PALM-3000 Requirements Overview Highlights from the Stimulus Requirement Document (StRD) version 1.1 (12/11/07) –There shall be a source that produces light over the entire spectrum used by the instrument (0.4-2.2um) that can be located at the equivalent of the telescope image plane (Science source) –There shall be a source that produces light at 589nm +/-10nm that can be located at the equivalent of 90km focus (LGS source) P3K-IRD-0465 –There shall be a source that is bright enough to be visible to the eye at full beam size (4.5 ” diameter) that can be located at the equivalent of the telescope image plane (Alignment Mode) –At least one source shall have a pupil stop at the location of the telescope pupil image –The Science source shall be adjustable in focus by +/-25mm –The Science source shall have a translation range of +/- 10mm in the x and y directions –The LGS source should be adjustable in focus from the equivalent of 80 to 120km –Stimulus shall have a seeing-size effective spot size of 0.5-1 ” for NGS –All sources shall have variable intensity –The stimulus package shall be configured such that the LGS and Science sources can be used at the same time –The stimulus package shall fit within current box

4. PALM-3000 Optical Design Top View White Light Aerotech Stages X, Y, Z 594 Laser Aerotech Z Stage FM1 FM2 OAP1 OAP2 Conjugate Telescope Focus Beam Entrance Hole (old fold mirror) Pupil Mask Flipper 80:20 Beamsplitter

5. PALM-3000 The New P3K Stimulus All reflective design; pupil shared by all 3 sources We will re-use 3 pieces of the current stimulus 1.The white light source and fiber in the rack 2.The HeNe alignment laser 3.The fold mirror (and Newport motor) on the AO bench will be retained in its current location and height All other pieces in the current stimulus package will be removed We will build the new stimulus package on a duplicate breadboard (24” x 24”) at JPL Work will be done by April 9, May 9 at latest

6. PALM-3000 Rack Design Front View New additions are in RED Newport Versastar 0.5” filter wheel c = 1550 nm c = 460 nm

7. PALM-3000 Light Source Issues White Light Source magnitudes –R-band (WFS) = 2.3 –K-band (Pharo) = -0.3 –The new white light will be 30% fainter than the old white light due to beamsplitter and reflective surface loss The 632 nm alignment laser will project in multi mode when using the white light fiber (2 lobes in V-band), although most of the light (>85%) remains in the core of the fiber output. The 632 nm alignment laser may be used as a single mode alignment source through the 594 nm laser fiber with the 594 fiber output Aerotech stage set to 0 km. The 2 laser source intensities may be reduced by using a combination of neutral density filters mounted in a manually selectable filter wheel placed at the output of both lasers.

8. PALM-3000 594 and 632 Magnitudes For the 594 and 632 nm laser magnitudes of the new design, we calculated the overfill loss at the pupil in the stimulus, assumed 20% loss at the fiber couple, 2% loss at each optical surface, and an 80:20 beam splitter at the 594 nm input SourceFiber Used (mode)ND UsedMag @ WFS 594594 (single)None-8.5 594594 (single)4.01.5 594594 (single)4.0 + 2.06.5 594594 (single)4.0 + 3.09.0 594594 (single)4.0 + 4.011.5 632 *594 (single)None-9.6 632 *594 (single)4.0 + 4.010.4 632White Light (multi)None-9.3 632White Light (multi)4.0 + 4.010.7 * The 594 nm laser stage must be moved to 0 km for 632 source alignment

9. PALM-3000 Science Focal Spot Diagrams 450 to 2200 nm Spot Diagram at center, +/- 1 mm, and +/- 10 mm

10. PALM-3000 Alignment Tolerances Stimulus source total wavefront error requirement = 300 nm / (2) 1/2 = 212 nm OAP vendor (B-Con) guarantees /4 with best effort to /8. /4 OAP fabrication surface error results in 112 nm wavefront error for 2 OAPs Final wavefront error = [(alignment errors) 2 + (fabrication errors) 2 ] 1/2 = 212 nm Wavefront error from alignment will not exceed 180 nm to satisfy total wavefront error requirement

11. PALM-3000 Cable / Controller Additions The existing Aerotech EPAQ controller will be modified to run 7 stages (it currently controls 3 stages) The 4 new Aerotech stages in the stimulus will connect to the existing Aerotech controller via 4 10 meter cables, which will be bundled together

12. PALM-3000 Stimulus Cover Output opening Pupil Access Side Pupil Access Handles

13. PALM-3000 Final Cost List NameQuantityVendorCost 2 OAP mirrors2B-Con (total) 6750 X,Y stages (ATS-50-25)2Aerotech(total) 8295 460 nm cutoff fibers (2 m and 5 m)2Thorlabs(total) 166 460 nm cutoff fiber (10 m)2Thorlabs(total) 336 ND filter wheel hub1Newport109 ND holders ( 12.7mm diam x 10 mm thick )5Newport(total) 145 2.0 ND filter ( 12.7 mm diam x 2 mm thick )1Thorlabs20 3.0 ND filter ( 12.7 mm diam x 2 mm thick )1Thorlabs20 4.0 ND filter ( 12.7 mm diam x 2 mm thick )5Thorlabs(total) 100 OAP Gimbal Mounts (Bartos - FQPM)2In House(total) 500 80:20 beamsplitter1CVI310 Fiber Coupling Hardware1Thorlabs516 Pupil flipper mount1NewFocus248 Mechanical Fabrication of Pupil Mask1JPL (Bartos)200? Mechanical Fabrication of Cover1Caltech (Bui)2000? Total$ 19715 Items in hand are green, items on order are blue

14. PALM-3000 Pencil Beam A pencil beam laser source, a fold mirror, and a magnetic kinematic mount will be permanently added outside of the stimulus cover for AO lab testing. These additions will not vignette any part of the stimulus beam nor will they block the off-axis relay mounts. The second fold mirror will be permanently fixed to the magnetic mount’s twin for quick and easy assembly. Permanent Laser Permanent Fold Permanent Mount Temporary Fold

15. PALM-3000 Phase Screens During the design review, CD jewel case covers were suggested as a simple cost-effective method to generate various spot size disks in the output beam of the stimulus. Once the stimulus is working, we can try this The 6” diameter door on the top of the cover should allow easy access and jewel case placement (pieces of plexi-glass?)