Coherent Phonon Generation and High Frequency Phonon Spectroscopy.
Final rept. 29 Mar 82-28 Sep 85,
GEORGIA UNIV ATHENS
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A number of optical techniques have been developed in recent years which have been applied to study the dynamics of high frequency phonons. Monoenergetic phonons were generated by spin-lattice relaxation between two electronically excited states of an impurity ion. Resonant trapping provided the means to detect these phonons with good temporal resolution. VSPS was used to detect high frequency phonons over a wide frequency range with excellent temporal, spectral and spatial resolution. The life-time of a monoenergetic non-equilibrium distribution of phonons was determined by the observation of optical dephasing, using free induction decayFID, which results from phonon induced coherence lossPICOLO. Non-resonant fluorescence line narrowingFLN techniques provided a means to determine the spectral distribution of non-equilibrium phonons generated by spin lattice relaxation. Keywords Phonons Phonon decay Coherent phonon generation Phonon spectroscopy High frequency phonons and Monoenergetic phonons.
- Solid State Physics