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