Stimulated Raman and Concentration Scattering
Abstract
Two reports are presented. In the first, from the general formulation of the coupling of a laser wave and a scattered light wave with density, temperature and concentration fluctuations in a binary fluid mixture, an expression for the gain g(c) of stimulated concentration scattering was derived. It was shown that this gain is usually much smaller than the gain for stimulated Brillouin scattering, g(B). However, in gaseous mixtures at relatively low pressures, with a large difference in polarizability as well as in mass between the two components, g(c) can become larger than g(B). A large difference in polarizabilities increases the coupling of light to the concentration fluctuations, while a large difference in mass produces a pronounced increase in damping of a sound wave. The calculated values for g(c)/g(B) are compared with experimental results5 In the second briefer report the observation of stimulated Rayleigh scattering caused by concentration fluctuations in a non-absorbing binary gaseous mixture of SF6 and He is discussed. The experimental results are in good agreement with theoretical expectations.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1970
- Accession Number
- AD0714172
Entities
People
- C. S. Wang
- H. Lowdermilk
- M. Matsuoka
- Nicolaas Bloembergen
Organizations
- Harvard University