5. Einstein coefficients for absorption, spontaneous emission and stimulated (or induced) emission
The reciprocal action of an electromagnetic wave and an atomic system characterized by its discrete energy levels can be treated by the processes of absorption, spontaneous emission and induced emission. Einstein defined these different mechanisms by coefficients reflecting the probabilities of each.
5.1 Absorption mechanism
Consider a cavity containing n 0 atoms of which n 1 are in the fundamental level, illuminated by a parallel beam of light of frequency ν, such that E 2 – E 1 = hν and energy spectral density ρ(ν), ρ(ν) represents the energy contained in the exciting beam...
Exclusive to subscribers. 97% yet to be discovered!
Already subscribed? Log in!
Einstein coefficients for absorption, spontaneous emission and stimulated (or induced) emission
Resonant cavity and laser beam intensity
Bibliography
- (1) - Les Lasers et Leurs Applications Scientifiques et Médicales - Édition C. Fabre et J. P. Pocholle, Les Éditions de Physique (Paris) (1996). 1.1 C. FABRE, Les Lasers – Principes Fondamentaux, pp. 1-40. 1.2 G. BOULON, Matériaux pour Lasers à Solide, pp. 259-286. 1.3. H. MONERIE, Fibres optiques dopées et applications,...
Exclusive to subscribers. 97% yet to be discovered!
Already subscribed? Log in!
Article included in this offer
"Optics and photonics"
(
209 articles
)
Updated and enriched with articles validated by our scientific committees
A set of exclusive tools to complement the resources
