JWST: MIRI, Coronagraphy, NIRSPec

24 Março 2025, 14:00 • José Manuel Rebordão

NIRCam coronagraphy.
MIRI: coronography, 4QPM masks. Other architecture and optics elements of MIRI, excluding MRS: FoV, observation modes, spectral elements, calibration, low resolution spectroscopic modes, prism,
NIRSpec: system basics. FoV. Optical path. Micro-shutter Array (MSA) technology.
 
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NIRSpec. IFU. NIRISS

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JWST: NIRCam, Coronagraphy

21 Março 2025, 09:00 • José Manuel Rebordão

NIRCam: Architecture of the instrument. Beam-splitter. Analysis of the functions of the filters in the filter and pupil wheels. Coronographic mask and their “half-tone” implementation.
The Weak Lenses and the Pupil Image Lens.
For the OTE and different instruments: huge importance of the two sets of conjugations: between different real image planes, and between the stop (at the PM) and the different real pupil images.
 
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MIRI, NIRSpec

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JWST: FGS

17 Março 2025, 14:00 • José Manuel Rebordão

Specific topics: TMA architecture, orbits, Strehl ratio. The FSM and the real image of the PM. Sequence of real images of the PM throughout JWST instruments. EM meaning of conjugation between planes.
FGS and its heritage. Redundancy. SEU concept. Engineering subsystems and criticality.
FGS architecture and its operational modes.
 
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NIRCam

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James Webb Space Telescope

14 Março 2025, 09:00 • José Manuel Rebordão

JWST – James Webb Space Telescope
Mission. Platform: Space systems specificities. Architecture. Main systems. Orbit. OTE and ISIM. FoR, FoV, iFoV. TMA architecture. OTE optics.
 
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Pupil function and PSF. Wavefront errors, individual surface contribution.
FGS, NIRCam, MIRI. NIRSpec

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Holography (class 2 of 3)

12 Março 2025, 15:00 • Alexandre Pereira Cabral

Introduction to practical Holography, building objects. Setup of a Denisyuk configuration, consisting of a volume-reflection holography technique. As a recording medium, a silver halide emulsion on a glass plate will be used (a matrix of cohesive silver crystals in a transparent medium). During exposure, the reference wave and the waves reflected from the object result in an interference structure that was recorded within the emulsion. Students produced their own objects that will be exposed in a 50 mm x 50 mm plate. Students performed several exposures using different types of objects (including lenses or mirrors to generate holographic optical elements known as HOE. Analysis of non-holographic technics, bases on the Peper’s ghost concept, will be shown in the lab for analysis.

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