Sumários

James Webb Space Telescope System

11 Março 2024, 14:00 • José Manuel Rebordão

JWST – scientific objectives. The system and its historical background. The user – engineer pipeline.

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

NEXT CLASS

TRL, SRL.

FGS. NIRCAM

Nonlinear optics

8 Março 2024, 09:00 • José Manuel Rebordão

Third order effects: spectral broadening, supercontinuum; four wave mixing, holography, phase-conjugated mirrors.

Overview: parametric and non-parametric effects, virtual states.

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JWST – system overview

BIBLIOGRAPHY

Saleh

Holography (class 2 of 3)

6 Março 2024, 15:00 • Alexandre Pereira Cabral

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.

Nonlinear optics

4 Março 2024, 14:00 • José Manuel Rebordão

Second order effects: electrooptics, 3-wave-mixing; energy and momentum conservation, the multiphoton processes; phase matching, concept and implementation, types of phase matching. OFC, OPA, OPO, SPDC. A brief overview of coupled-waves theory and of its typical models applied to 2nd order effects. Brief overvier of the importance of SPDC to optical qubits.

Third order effects: optical Kerr effect, self-phase modulation (SPM), self-focusing, filamentation.

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Raman gain, 4 wave mixing, conjugated phase mirrors, photo-refractive materials.

BIBLIOGRAPHY:

Saleh

Metals. Nonlinear optics

1 Março 2024, 09:00 • José Manuel Rebordão

Optics of metals. Models for conductivity. Plasma frequency. Interpretation of the optical constants below and above the plasma frequency. Colour of metals.

Brief comments on plasmons and their use as sensors.

Nonlinear optics: Duffing model and its relation to harmonics generation.

Second-order effects: SHG, rectification and the electrooptics.

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Three wave mixing. Phase matching Third order effects and associated phebnomena.

BIBLIOGRAPHY:

Saleh