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ATST Imager and Slit Viewer Optics

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  1. ATST Imager and Slit Viewer Optics Ming Liang

  2. Optical Layouts Optical layout of the telescope, relay optics, beam reducer and imager.

  3. Gregorian Position Gregorian Instrument Bench

  4. Spot Diagrams Spot diagrams on the Gregorian focus

  5. Visible Imager Design Requirements

  6. N-BaK2 CaF2 N-BaK2 N-BaK2 CaF2 Silica F/20 Visible Imager FOV: 3’ x 3’. Wavelength band:0.33 to 1.1 μ. Flat focal surface and telecentric output. The total bulk absorption is about 7% at 330 nm wavelength band

  7. Spot diagrams for f/20 imager, within 3’x3’ fields. The circles in the spot diagrams are Airy disk size at 630 nm wavelength. Up left: Normal position. Up: 45º altitude. Left: 45º azimuth.

  8. Slit viewer optics Slit mirror F/20 imager F/20 Visible Imager and Slit Viewer Optics FOV: 3’X3’, wavelength band: 0.33 to 1.1 μm, slit mirror tilt 22.5°

  9. Spot diagrams for f/20 slit viewer, within 3’x3’ fields. The circles in the spot diagrams are Airy disk size at 630 nm wavelength Up left: Normal position. Up: 45º altitude. Left: 45º azimuth.

  10. N-BaK2 CaF2 N-BaK2 Silica CaF2 N-BaK2 F/40 Visible Imager FOV: 1.5’ x 1.5’. Wavelength band:0.33 to 1.1 μ. Flat focal surface and telecentral output Con-focus with that of f/20 imager

  11. Spot diagrams on f/40 Imager focus within 1.5’x1.5’ fields. The circles in the spot diagrams are Airy disk size at 630 nm wavelength Up left: Normal position. Up: 45º altitude. Left: 45º azimuth.

  12. Slit viewer optics F/40 imager F/40 Visible Imager, Slit Mirror and Slit Viewer Optics FOV: 1.5’x1.5’, wavelength band: 0.33 to 1.1 μm, flat focus. The same guiding system works for both f/20 and f/40 imager.

  13. Spot diagrams for f/40 guider, within 1.5’x1.5’ fields. The circles in the spot diagrams are Airy disk size at 630 nm wavelength Up left: Normal position. Up: 45º altitude. Left: 45º azimuth.

  14. IR Imager Design Requirements

  15. F/20 IR Lens Imager FOV: 3’ x 3’. Wavelength band:1 to 5 μ., Flat focal surface and telecentric output. Lens materials (follow the light pass): ZnSe, BaF2, CaF2 and CaF2.

  16. Spot Diagrams Spot diagrams of f/20 lens imager for wavelength from 1 to 5 μm. The circles in the spot diagrams are Airy disk size at 1.6 μm wavelength.

  17. F/40 IR lens imager FOV: 1.5’ x 1.5’. Wavelength band:1 to 5 μ., Flat focal surface and telecentral output.To make it con-focus with f/20 imager, there are two more lenses than the f/20 IR lens imager. Lens materials (follow the light pass): ZnSe, BaF2, CaF2, ZnSe, BaF2 and CaF2.

  18. Spot Diagrams Spot diagrams of f/40 IR lens imager. The circles in the spot diagrams are Airy disk size at 1.6 μm wavelength.

  19. Reflected Imager Options(For visible and IR)

  20. Optical Design Requirements

  21. F/20 Reflected Imager 2 mirror F/20 imager with flat focal surface and telecentric output.

  22. Spot diagrams for f/20 Imager, within 3’x3’ fields. The circles in the spot diagrams are Airy disk size at 630 nm wavelength Up left: Normal position. Up: 45º altitude. Left: 45º azimuth.

  23. Folding mirror F/40 Reflected Imager Optical layout of f/40 visible imager with flat focus and telecentral output FOV: 1.5’x1.5’, wavelength band: 0.33 to 1.1 μm.

  24. Spot diagrams on f/40 Imager focus within 1.5’ x 1.5’ field. The circles in the spot diagrams are Airy disk size at 630 nm wavelength Up left: Normal position. Up: 45º altitude. Left: 45º azimuth.

  25. F/40 Imager folding mirrors F/20 Imager F/40 Imager Imager Exchange The drawing shows how to exchange the f/20 imager to f/40 imager. When the f/40 imager is inserted, the f/20 beam will be bypassed by the f/40 folding mirror to the detector.

  26. Visible channel IR channel Dichroic System Arrangement Lens imagers in visible channel and mirror imagers in IR channel

  27. Optical Train From Telescope to DetectorATST 250 K Visible SpectrographExample(Current Spectrograph to be presented by David Elmore or HAO and Don Mickey for IR version) Telescope – Collimator Relay – Beam Reducer – f/20 Imager – CT spectrograph

  28. F/20 imager Spectrograph F/20 Imager and Spectrograph

  29. Whole Optical Layout The optical layout shows the whole system from telescope to spectrograph.

  30. Multiple Instrument Example

  31. Multiple Instrument Example

  32. Multiple Instrument Example