Sound Amplification by Stimulated Emission of Radiation in an Amorphous Compound

Autor:	M. Devaud, J. Joffrin, R. Höhler, J.-Y. Prieur
Rok vydání:	1993
Předmět:	Materials science business.industry Phonon General Physics and Astronomy Resonant absorption Population inversion Molecular physics Sound amplification by stimulated emission of radiation Amorphous solid Optics Ultrasonic sensor Stimulated emission Absorption (electromagnetic radiation) business
Zdroj:	Europhysics Letters (EPL). 24:409-414
ISSN:	1286-4854 0295-5075
Popis:	Glassy systems have long been known to strongly attenuate ultrasonic waves at low temperatures. This is due to the resonant absorption of phonons by the so-called Two-Level Systems any amorphous medium contains. Should the populations of those TLS be inverted, the medium becomes amplifying, stimulated emission then prevailing over absorption. We present in this paper an experiment of sound amplification by stimulated emission of radiation, and we describe the acoustic pumping process that achieves the population inversion in glasses.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::781756c6ae23304f91002b509ce4604e https://doi.org/10.1209/0295-5075/24/5/015 Zobrazit plný text záznamu