Sumários

Fabrico de sensores em fibra - LPG's

9 Dezembro 2019, 14:00 • David de Castro Alves

Fabrico de sensores em fibra - LPG's (continuação)
medição do índice de refracção de diversas concentrações de glicerol

LASERS

3 Dezembro 2019, 09:00 • José Manuel Rebordão

Interaction between  radiation and matter: spontaneous and stimulated emission, absorption. Spectral line: need, model and enlargement due to different causes; Lorentzian and gaussian profiles.

Inversion of population; optical gain / amplifier; need to escape from thermal equilibrium. Need for pumping systems.

3 and 4 levels laser architectures: main characteristics, constrain on the different probabilities of transition; the metastable initial state. Overview of 1st order linear laser equations. The role of spontaneously emitted photons.

Main characteristics of pumping systems: optical, electromagnetic, mechanical, chemical. Examples,

Amplifiers: Nd.

 

NEXT CLASS

Lasers: other amplifiers. Resonant cavity. Beam. Spectrum. Systems.

BIBLIOGRAPHY

Saleh B.E.A, Fundamentals of Photonics, Caps.13, 14, 15

Fabrico de sensores em fibra - LPG's

2 Dezembro 2019, 15:00 • David de Castro Alves

Breve apresentação aos sensores de fibra LPG's
Instruções de segurança de lasers de classe III
Instruções de manuseamento do equipamento de fabrico de LPG's
Fabrico de LPG's

Fabrico de sensores em fibra - LPG's

2 Dezembro 2019, 14:00 • David de Castro Alves

Breve apresentação aos sensores de fibra LPG's
Instruções de segurança de lasers de classe III
Instruções de manuseamento do equipamento de fabrico de LPG's
Fabrico de LPG's

LUMINESCENCE AND SCATTERING

26 Novembro 2019, 09:00 • José Manuel Rebordão

Luminescence

Types of luminescence and their main characteristics.

Photo-physical processes in molecules. Examples of Intersystem crossings (FRET, dipolar coupling, quantum collisions in He-Ne lasers, etc).

Difference between singlet and triplet states. Differences between fluorescence and phosphorescence.

Multiphotonic fluorescence and application in nonlinear microscopy. 

Scattering

Rayleigh scattering, main characteristics, atmospheric phenomena; brief reference to Mie scattering.

Raman scattering (RS): classical model; stimulated RS (SRS); coherent Raman spectroscopies, CARS (see previous class).

Brillouin scattering: phonons, elastic waves in solids; stimulated Brillouin scattering.

An overview of quasi-particles

 

Presentation by Luís Neves: Graphene detectors and applications

 

NEXT CLASS

Lasers

BIBLIOGRAPHY

Photonic processes - Saleh B.E.A, Fundamentals of Photonics, Caps. 15, 21

Quasiparticles - https://en.wikipedia.org/wiki/Quasiparticle,  https://en.wikipedia.org/wiki/List_of_quasiparticles