atst imager and slit viewer optics
DESCRIPTION
ATST Imager and Slit Viewer Optics. Ming Liang. Optical Layouts. Optical layout of the telescope, relay optics, beam reducer and imager. Gregorian Position. Gregorian Instrument Bench. Spot Diagrams. Spot diagrams on the Gregorian focus. Visible Imager Design Requirements. - PowerPoint PPT PresentationTRANSCRIPT
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ATST Imager and Slit Viewer Optics
Ming Liang
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Optical layout of the telescope, relay optics, beam reducer and imager.
Optical Layouts
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Gregorian Position
Gregorian Instrument Bench
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Spot diagrams on the Gregorian focus
Spot Diagrams
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Design property Requirement
Field of view 3’ x 3’ for f/20 imager
1.5’ x 1.5’ for f/40 imager
Wavelength band 0.33 to 1.1 μm
Image quality Within the diffracted limitation
Focal surface Flat focal surface and telecentric output
Visible Imager Design Requirements
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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
N-BaK2 CaF2 N-BaK2 N-BaK2 CaF2 Silica
F/20 Visible Imager
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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.
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FOV: 3’X3’, wavelength band: 0.33 to 1.1 μm, slit mirror tilt 22.5°
Slit mirror
Slit viewer optics
F/20 imager
F/20 Visible Imager and Slit Viewer Optics
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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.
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N-BaK2 CaF2 N-BaK2 CaF2 N-BaK2 Silica
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
F/40 Visible Imager
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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.
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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.
F/40 imager
Slit viewer optics
F/40 Visible Imager, Slit Mirror and Slit Viewer Optics
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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.
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Design property Requirement
Field of view 3’ x 3’ for f/20 imager
1.5’ x 1.5’ for f/40 imager
Wavelength band 1 to 5 μm
Image quality Within the diffracted limitation
Focal surface Flat focal surface and telecentric output
IR Imager Design Requirements
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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.
F/20 IR Lens Imager
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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.
Spot Diagrams
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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.
F/40 IR lens imager
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Spot diagrams of f/40 IR lens imager. The circles in the spot diagrams are Airy disk size at 1.6 μm wavelength.
Spot Diagrams
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Reflected Imager Options(For visible and IR)
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Design property Requirement
Field of view 3’ x 3’ for f/20 imager
1.5’ x 1.5’ for f/40 imager
Wavelength band 0.33 to 28 μm
Image quality Within the diffracted limitation
Focal surface Flat focal surface and telecentric output
Optical Design Requirements
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212 mirror F/20 imager with flat focal surface and telecentric output.
F/20 Reflected Imager
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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.
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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.
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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.
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F/40 Imager
F/40 Imager folding mirrors
F/20 Imager
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.
Imager Exchange
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IR channel
Visible channel
Dichroic
Lens imagers in visible channel and mirror imagers in IR channel
System Arrangement
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Optical Train From Telescope to DetectorATST 250 K Visible Spectrograph
Example(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
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F/20 imager
Spectrograph
F/20 Imager and Spectrograph
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29The optical layout shows the whole system from telescope to spectrograph.
Whole Optical Layout
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Multiple Instrument Example
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Multiple Instrument Example
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Multiple Instrument Example