Sumários

Alignment of optical components and system - Groups JMR-3 & JMR-4

29 Setembro 2022, 15:00 • José Manuel Rebordão

Laser beam, observation of the irradiance distribution, divergence, noises,
Mechanical holders for lenses and mirrors. Reference diaphragms. Controlling degrees of freedom for translation and rotation, in practice.
Alignment of lenses using reflections from both surfaces, eventually also reflected by laser output coupler, and their interference patterns (if visible).
Laser instability upon perturbation of gain by feedback of the output beam.

Radiometry - 3

29 Setembro 2022, 14:00 • José Manuel Rebordão

Image irradiance, vignetting, examples. Rays and elementary beams of radiation.

The atmospheric system.

Thermal emission laws. Approximations. Gray bodies, emissivity and its dependences. Brightness temperature and its use for large wavelengths.

 

BIBLIOGRAPHY

See slide 2 of the presentation.

NEXT CLASS

BRDF. Geometrical optics – review:  paraxial concepts, aberrations (ray and wavefront)

Alignment of optical components and systems - GROUP JMR-1 & JMR-2

26 Setembro 2022, 11:00 • José Manuel Rebordão

Laser beam, observation of the irradiance distribution, divergence, noises,
Mechanical holders for lenses and mirrors. Reference diaphragms. Controlling degrees of freedom for translation and rotation, in practice.
Alignment of lenses using reflections from both surfaces, eventually also reflected by laser output coupler, and their interference patterns (if visible).

Radiometry - 2

26 Setembro 2022, 10:00 • José Manuel Rebordão

Clarification on topics of last class. Spectra form different natural and artificial sources and relation to absorption spectra of Si and Ge. Impact of spectra representation (wavelength or frequency or spatial frequency) on radiometric equations.

Sensitivity function of different sensors (+filters): the eye, specific astronomical photometric systems. Visual photometry, CIE Standard Luminosity curve. The Lumen. Photometric quantities and their radiometric counterparts. Short reference to old, historical photometric units. Luminous efficiency: definition and examples. 

Lambertian sources, relation M(L) for Lambertian sources and cos variation of the intensity from Lambertian sources.

General Radiative Transfer concept and model from radiance. Limit cases. Inverse square law for irradiance. View or Configuration factors: concept and practical details, examples.


BIBLIOGRAPHY (for  Radiometry)

See slide 2 of the presentation.

NEXT CLASS

General radiometric theorems. Thermal emission concepts. BRDF

Alignment of optical components and systems

26 Setembro 2022, 08:00 • João Miguel Pinto Coelho

Concepts of safety in the lab.

Beams, alignments, rotational and translational degrees of freedom. Reflected and transmitted beams. Multiple reflections.
Using mirrors to manipulate the optical axis.