Sumários

James Webb Space Telescope

17 Abril 2023, 10:00 • José Manuel Rebordão

Space and ground systems main differences. Architecture. Main systems. Orbit. OTE and ISIM. FoV. TMA architecture. OTE optics. Pupil function and PSF. Wavefront errors, individual surface contribution.

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FGS. NIRCAM

Signal Recycling Cavity. Suspensions

14 Abril 2023, 12:00 • José Manuel Rebordão

Signal Recycling Cavity: descriptions, analysis, poles. Temporal operating mode of LIGO.

Presentation of Nuno Covas: LIGO Suspension of mirrors -overall description.

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JWST

Michelson interferometry (2 in 3)

5 Abril 2023, 11:00 • Alexandre Pereira Cabral

Setup of a Michelson Interferometer (MI), using amplitude splitting, and analysis of the generated interferograms in several configurations.

Usage of cube beam splitters and polarisation optics to control laser beam polarization.

Assessment of how the MI can be used to measure relative displacements of one of the mirrors, using a piezo electric stage actuator to move one of the mirrors.

Analysis of several polarization optical elements (polarizers, polarizing beam splitters and wave plates) using a polarimeter (an instruments that measure the polarisation state of light).

Assembly of a homodyne quadrature detection configuration to achieve higher resolution compared to the previous simple homodyne detection.

Acquisition of interferograms using a CMOS 2D camera for psot processing.

FALTA

3 Abril 2023, 10:00 • José Manuel Rebordão

AUSÊNCIA

Adaptive optics

31 Março 2023, 12:00 • José Manuel Rebordão

System approach. The atmosphere as a phase object. Phase correlations within cells and dependence on wavelength.

Main subsystems. Shack-Hartmann sensor. Examples.

Phase retrieval. Regularization. Grad2Surf Matlab code.