Sumários
Fabrico de sensores em fibra - LPG's
9 Dezembro 2019, 14:00 • David de Castro Alves
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
Fabrico de sensores em fibra - LPG's
2 Dezembro 2019, 14:00 • David de Castro Alves
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