Photoacoustic Spectroscopy of Dielectric and Semiconducting Solids.
Abstract
The recently developed techniques of solid state photoacoustic spectroscopy have been applied to the study of absorption processes in dielectric and semiconducting solids which are of interest in high power laser or electronic applications. The photoacoustic effect involves the irradiation, using a modulated light source, of a material in a closed cell. Incident photons which convert to heat in the sample by nonradiative processes result in temperature and pressure fluctuations in the coupling gas in the cell synchronous with the modulated source. Through the use of appropriate pulsed and chopped cw infrared and visible wavelength sources, these investigations have provided new information about a wide range of absorption effects including optical absorption in highly transparent materials, nonlinear absorption, localized defect characterization, spectroscopy of absorbed surface impurities, and semiconductor absorption processes. The photoacoustic method has high sensitivity, good spatial and temporal resolution, and the ability to separately detect nonradiative processes, which have made it uniquely suited for these investigations. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1981
- Accession Number
- ADA107613
Entities
People
- Sinclair S. Yee
Organizations
- University of Washington