Coherent phonon avalanches

Avalanches of resonant acoustic phonons are observed following population inversion of the Zeeman-split E( 2E) doublet in dilute ruby by selective optical pumping. In confined geometries only a single stage of stimulated emission is seen, whereas longer crystals form an acoustic cavity allowing mult...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 1999-03, Vol.263, p.30-33
Main Authors: de Wijn, H.W, van Walree, P.A, Arts, A.F.M
Format: Article
Language:English
Subjects:
Coherent phonons
Phonon avalanches
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Summary:Avalanches of resonant acoustic phonons are observed following population inversion of the Zeeman-split E( 2E) doublet in dilute ruby by selective optical pumping. In confined geometries only a single stage of stimulated emission is seen, whereas longer crystals form an acoustic cavity allowing multiple passage of the phonon pulse through the active zone. Coherent equations of motion for the lattice displacement and the spin Bloch vector excellently account for these results.
ISSN:0921-4526
1873-2135
DOI:10.1016/S0921-4526(98)01467-7