Nanosecond Time-Resolved Spectroscopy of High Energy Phonons and Studies of Non-Linear Phonon Physics.
Abstract
The dynamics of high frequency phonons has proven to be a difficult area of investigation. The general problem we have investigated is one of developing optical techniques to study high frequency phonon dynamics. A statement summarizing the problem, as we have examined it, can be most conveniently presented in four parts as described below; (1) The mechanisms of decay and lifetime of high frequency phonons (= or > 200 GHz) including the case of strong resonant trapping. (2) Generation of high frequency phonons by stimulated emission under conditions of a population inversion. (3) Development of computer simulation techniques to describe the dynamics of high frequency phonons resonantly trapped by an inhomogeneously broadened resonance with inclusion of stimulated emission; and (4) Development of techniques to reduce the spectral bandwidth of a coaxial flashlamp-pumped tunable dye lasers for use in problems (1) and (2). Problem (1) and (2) have been examined for several insulating ionic solids incorporating small amounts of impurity ions whose electronic states are accessible with visible light. The electronically excited ions serve to generate, detect and resonantly trap the nearly monoenergetic distribution of high frequency phonons. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 10, 1982
- Accession Number
- ADA112793
Entities
People
- David P. Landau
- John E. Rives
- Richard S. Meltzer
Organizations
- University of Georgia