Accession Number : AD0721310

Title :   Application of Photon Echo Resonance to Problems in Solid State and Optical Physics.

Descriptive Note : Final technical rept., 1 Dec 65-30 Jun 69,

Corporate Author : CHICAGO UNIV ILL DEPT OF PHYSICS

Personal Author(s) : Abella,Isaac D.

Report Date : SEP 1970

Pagination or Media Count : 37

Abstract : The basic experimental phenomenon of photon echo resonance consists of applying two brief laser pulses, separated by a time tau, to a resonant absorbing system. In the work discussed, the source is a liquid nitrogen cooled ruby laser, Q-switched by Kerr-cell, while the absorbing media are samples of ruby. The target system responds by emitting an echo pulse at time 2 tau whose amplitude is characteristic of the state of phase coherence. The echo is detected by a photomultiplier and suitably displaced. Thus, such phase disrupting phenomena as lattice vibration, i.e., phonon excitation, or magnetic interactions with the same, or different species of atom, contribute to the echo decay. The original proposal made in this contract, contained several programs of study, which have been successfully carried out. We proposed to study the magnetic properties of echo generation, which is described by Modulation of Echoes. We also proposed the study of concentration dependence and other temperature-independent decay. This is described in the body of the report as is the important advance in direct measurement of lifetimes of photon-echo decay. One of the consequences of this work is the development of circular polarized excitation in which clear separation of echo subsystems are observed. (Author)

Descriptors :   (*SOLID STATE PHYSICS, COHERENT RADIATION), PHOTONS, PHONONS, CRYOGENICS, RUBY, LIGHT PULSES, POLARIZATION

Subject Categories : Lasers and Masers
      Optics
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE