Stellar Observations Network Group (SONG): SONG in New Mexico

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song_spectrograph_assembly

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SONG spectrograph assembly
  1. Prepare optical table with acceptable support and sufficient access on all sides (while attempting to minimize total footprint
  2. Mark optical table with locations of mounts based on lab measurements
  3. set up upper table on main optical bench in correct location. Install:
    1. fiber input,
    2. collimating assembly. Check with auto-collimator.
    3. laser input via removable beam splitter,
    4. camera output via removable beam splitter, Check with auto-collimator?
    5. output focusing lens.
    6. Check alignment with laser, ensure camera functionality.Install slit to ensure focal plane is at desired height above optical table
  4. Install FM1 at desired height. Position to get desired deflection angle
  5. Install collimating telescope behind table. Adjust diagonal mirrors to ensure proper alignment
  6. Install grating mirror and align with collimating telescope
  7. Install FM2 and align with collimating telescope (do now to ensure consistency with grating mirror)
  8. Install FM3 and align with collimating telescope (do now to ensure consistency with grating mirror)
  9. Install OAP1. Adjust initial height and tilt using autocollimator off mirror on back of mount. Adjust lateral so laser falls at appropriate location on the OAP (52mm from edge?).
  10. Align OAP1 using 10micron fiber input to minimize aberration
  11. Rotate spectrograph mirror to get 15mm separation between input and output laser. Adjust further to ensure that reflected beam misses FM1.
  12. Install OAP2. Adjust initial height and tilt using autocollimator off mirror on back of mount. Adjust lateral so laser falls at appropriate location on the OAP.
  13. Rotate FM3 so that return beam goes back into camera.
  14. Align OAP2 using 10 micron fiber input to minimize aberration
  15. Install prism. Rotate FM3 to ensure correct beam location
  16. Install camera. Adjust to ensure correct beam location: no light falling outside any optic
  17. Image cross-disperser fiber. Ensure expected width. Adjust detector to make vertical spectrum. Rough prism adjustment to get laser at correct location on detector.
  18. Install grating.
  19. Adjust grating tilt and prism to ensure good spectral coverage: grating so that peak of blaze function near center of detector, and prism to ensure good wavelength coverage.
song_spectrograph_assembly.1745525218.txt.gz · Last modified: by holtz