Tunable optical detection and generation of terahertz phonons in CaF2 and SrF2

15 April 1979

journal article
research article
Published by AIP Publishing in Applied Physics Letters

Vol. 34 (8) , 481-483
https://doi.org/10.1063/1.90855

Abstract

A new method for tunable detection and generation of terahertz phonons is reported. It is based on our observation that the lowest energy level of excited Eu²⁺ ions in CaF₂ and SrF₂ crystals can be split by uniaxial stress into two levels with a variable separation up to 2.4 THz. Phonons are generated by one‐phonon relaxation between these levels and detected by phonon‐induced fluorescence radiation from the upper level. The detector is applied to study the spectral distribution of phonons generated by the heat‐pulse technique.

Keywords

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