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ao:labao_alignment [2018/07/07 09:24]
jones [Notes from tests of LABAO and TWFS alignment 2015-12-07]
ao:labao_alignment [2018/07/07 09:25] (current)
jones
Line 18: Line 18:
   - Install the now complete SM1L10 lens tube on the front of the original SM1L10 lens tube.   - Install the now complete SM1L10 lens tube on the front of the original SM1L10 lens tube.
   - Install the assembly in the SM1 clamp. Determine the amount of rotation needed, and rotate the lenslet array appropriately.   - Install the assembly in the SM1 clamp. Determine the amount of rotation needed, and rotate the lenslet array appropriately.
-{{/file/view/IMG_3530.jpg/569376983/171x132/IMG_3530.jpg|IMG_3530.jpg}}\\ +{{ao:IMG_3530.jpg|IMG_3530.jpg}}\\ 
 ===== Initial Alignment of LABAO and BRT, Mike Ireland, 8 Dec 2015 ===== ===== Initial Alignment of LABAO and BRT, Mike Ireland, 8 Dec 2015 =====
 \\  This is the proceedure to align the LABAO system. It is assumed that all optics are already placed in their correct locations according to Zemax/other telescopes (Judit to write this procedure?). The optics from the vis/IR dichroic to the spherical mirror should be aligned with the screw holes on the table. It is also assumed that the LWFS should be initially aligned (above), and the LWFS system axis is aligned with the flat mirror/dichroic/lens axis by eye (<0.5mm on the front of the LWFS tube, and within 0.5 degrees).\\ \\  1. Ensure that the green laser on the Engineering beam is well aligned coming out of the visible table and hitting both the target on the IR table and the target at the north end of the lab. \\ \\  2. Adjust the target height to match the beam height at the vis/IR dichroic.\\ \\  3. Adjust the vis/IR dichroic to centre the beam on the spherical mirror. Check that the beam is centered within +/-2mm on the labao dichroic (it should be if you were careful in placing the optics in the right locations above!).\\ \\  4. Adjust the tilt of the spherical mirror to centre the scattered light on the DM.\\ \\  5. Adjust the tilt of the DM to keep the beam parallel to the screw holes and at the height of the target.\\ \\  6. Adjust the DM target so that the beam is centered on it. \\ \\  7. Create stops for the target in front of the BRT secondary to ensure that the beam strikes the target centrally, with a 0.2mm tolerance.\\ \\  8. Adjust the tilt of the BRT secondary so that the beam is centered on the rail target. Reducing the iris size helps here.\\ \\  9. Adjust the tilt of the BRT primary so that the beam is parallel to the rails. Iterate steps 8 and 9.\\ \\  10. Ensure that the WL fiber is replaced with the blue LED.\\ \\  11. Start the LABAO WFS system. Shift the aoi (area of interest) to roughly match the nominal beam location.\\ \\  12. With a small corner cube in place, centered by eye, ensure roughly even illumination of the 32 lenslets. The scale should match S1 - translate the tube in the tube mount (or on the translation stage) if this isn't the case. Zero centroids on the WFS. To expand the boxes, type e.g. "expand 1.1" to make a 10% expansion of the box locations. The boxes can be translated with the "move" command (in pixels) or by a GUI button.\\ \\  13. Align an autocollimation flat at the location of the small corner cube using the green laser, to zero out tilts.\\ \\  14. With the blue LED, tilt the LABAO dichroic to ensure even illumination of all 32 lenslets. 12 other lenslets should be partially illuminated (2 at the top/bottom/left/right and the missing "corners"). In this process, the boxes will have to be moved, and the AOI may also have to be slightly shifted.\\ \\  15. Zero centroids. Turn the Green laser on with appropriate ND. Move the small (standard) autocollimation flat with the small red knob to overlap with the centroid positions previously recorded with the blue LED. Cover the flat mirror (with e.g. a piece of paper).\\ \\  16. Click the "TOGGLE REFERENCE" button on the GUI, and zero centroids for the green laser. Click "SAVE DEF". All done! \\  This is the proceedure to align the LABAO system. It is assumed that all optics are already placed in their correct locations according to Zemax/other telescopes (Judit to write this procedure?). The optics from the vis/IR dichroic to the spherical mirror should be aligned with the screw holes on the table. It is also assumed that the LWFS should be initially aligned (above), and the LWFS system axis is aligned with the flat mirror/dichroic/lens axis by eye (<0.5mm on the front of the LWFS tube, and within 0.5 degrees).\\ \\  1. Ensure that the green laser on the Engineering beam is well aligned coming out of the visible table and hitting both the target on the IR table and the target at the north end of the lab. \\ \\  2. Adjust the target height to match the beam height at the vis/IR dichroic.\\ \\  3. Adjust the vis/IR dichroic to centre the beam on the spherical mirror. Check that the beam is centered within +/-2mm on the labao dichroic (it should be if you were careful in placing the optics in the right locations above!).\\ \\  4. Adjust the tilt of the spherical mirror to centre the scattered light on the DM.\\ \\  5. Adjust the tilt of the DM to keep the beam parallel to the screw holes and at the height of the target.\\ \\  6. Adjust the DM target so that the beam is centered on it. \\ \\  7. Create stops for the target in front of the BRT secondary to ensure that the beam strikes the target centrally, with a 0.2mm tolerance.\\ \\  8. Adjust the tilt of the BRT secondary so that the beam is centered on the rail target. Reducing the iris size helps here.\\ \\  9. Adjust the tilt of the BRT primary so that the beam is parallel to the rails. Iterate steps 8 and 9.\\ \\  10. Ensure that the WL fiber is replaced with the blue LED.\\ \\  11. Start the LABAO WFS system. Shift the aoi (area of interest) to roughly match the nominal beam location.\\ \\  12. With a small corner cube in place, centered by eye, ensure roughly even illumination of the 32 lenslets. The scale should match S1 - translate the tube in the tube mount (or on the translation stage) if this isn't the case. Zero centroids on the WFS. To expand the boxes, type e.g. "expand 1.1" to make a 10% expansion of the box locations. The boxes can be translated with the "move" command (in pixels) or by a GUI button.\\ \\  13. Align an autocollimation flat at the location of the small corner cube using the green laser, to zero out tilts.\\ \\  14. With the blue LED, tilt the LABAO dichroic to ensure even illumination of all 32 lenslets. 12 other lenslets should be partially illuminated (2 at the top/bottom/left/right and the missing "corners"). In this process, the boxes will have to be moved, and the AOI may also have to be slightly shifted.\\ \\  15. Zero centroids. Turn the Green laser on with appropriate ND. Move the small (standard) autocollimation flat with the small red knob to overlap with the centroid positions previously recorded with the blue LED. Cover the flat mirror (with e.g. a piece of paper).\\ \\  16. Click the "TOGGLE REFERENCE" button on the GUI, and zero centroids for the green laser. Click "SAVE DEF". All done!
ao/labao_alignment.1530969840.txt.gz ยท Last modified: 2018/07/07 09:24 by jones