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 1^st 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