Accession Number : AD0421990

Title :   PHONON INTERACTIONS IN CRYSTALS.

Descriptive Note : Quarterly progress rept. no. 1, 15 May-14 Aug 63,

Corporate Author : IBM WATSON RESEARCH CENTER YORKTOWN HEIGHTS N Y

Personal Author(s) : Nethercot,A. H. ; Shiren,N. S. ; Pomerantz,M.

Report Date : 14 AUG 1963

Pagination or Media Count : 46

Abstract : The purpose of this contract is to investigate various interaction processes of phonons in solids with a view towards developing and improving methods of amplifying, generating, frequency converting, and propagating microwave acoustic energy. A chief approach is to study the parametric amplification and parametric frequency conversion of acoustic waves, especially the forward travelling wave interaction. The use of paramagnetic ions in magnesium oxide is being investigated to maximize such effects. Since the phase velocity of an acoustic wave of a specific frequency can be changed by rsonating the paramagnetic ion, advantage can be taken of various constructive and destructive interference effects to enhance these travelling wave parametric mixing effects. Microwave acoustic masers and electron - phonon interaction effects are also being studied for the same reasons. (Author)

Descriptors :   (*ACOUSTICS, MICROWAVES), (*MASERS, ULTRASONIC RADIATION), (*ULTRASONIC RADIATION, PHONONS), (*PHONONS, CRYSTALS), TRANSDUCERS, SOUND GENERATORS, SOUND TRANSMISSION, MAGNESIUM COMPOUNDS, OXIDES

Distribution Statement : APPROVED FOR PUBLIC RELEASE