Nonlinear Spectroscopy.
Abstract
Work continued in the general area of Laser Spectroscopy, the emphasis being on coherent optical transients and precision spectroscopy. Both theoretical and experimental studies were conducted. The most notable experimental accomplishments include the development of new experimental techniques: 1) the laser frequency switching technique of observing coherent optical transients such as optical free induction decay and photon echoes for studying the dynamic properties of solids or gas phase collisions; 2) the extension of these ideas to the picosecond time scale using a novel traveling wave electro-optic phase modulator; 3) the frequency stabilization of dye lasers to a linewidth of approx. 100 Hertz for precision spectroscopic measurements; and 4) the Raman heterodyne detection method for observing nuclear magnetic resonance with a sensitive optical probe. One of the interesting applications of ultrastable dye lasers has been in the area of solid state laser spectroscopy where the optical homogeneous linewidths are of the order of 1 kilohertz or less. Other theoretical studies include 1) a generalized theory of two-photon processes; 2) oscillatory free induction decay which lead to a prediction of a new phenomenon that was later verified both in the optical and radio frequency regions; 3) an elegant theorem on coherent transients which sets a rigorous limit on the duration of any coherent transient emission signal; and 4) a theory of cumulative two-pulse photon echoes. Originator supplied keywords include: coherent optical transients, laser spectroscopy, photon echoes, free induction decay, bloch equations, relaxation mechanisms, decay time, molecular collisions, solids.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 20, 1985
- Accession Number
- ADA154708
Entities
People
- R. G. Brewer
Organizations
- International Business Machines Corporation (Armonk, NY)