Sumários
Spectroscopy (class 1 of 3)
26 Março 2025, 15:00 • Alexandre Pereira Cabral
Introduction to the operation of spectrometers and monochromators.
Study of the dispersion of light, the properties of diffracting elements and how they are used in monochromators and spectrographs. Spectral characterization of non-monochromatic light and its analysis in bench top spectrographs.
Building a prism and grating Spectrographs.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.
NEXT
NIRSpec. IFU. NIRISS
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.
NEXT
MIRI,
NIRSpec
Holography (class 3 of 3)
19 Março 2025, 17:00 • Bachar Wehbe
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.
Holography (class 3 of 3)
19 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.