Accession Number:

AD0743861

Title:

Analysis of Propagation in Space-Time Modulated Media Using Many-Space Scale Perturbation Theory.

Descriptive Note:

Physical sciences research papers,

Corporate Author:

AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS

Personal Author(s):

• Fante,Ronald L.

Report Date:

1972-03-22

Pagination or Media Count:

46.0

Abstract:

The coupled-mode equations for propagation in a medium modulated by a multiple-frequency travelling wave have been studied using many-space-scale perturbation methods. It is shown that the coupled modes propagate differently on different space scales, and that conditions for resonant coupling between modes are simply obtained by requiring no secular behavior of an asymptotic expansion for the forward and backward wave amplitudes. These principles are then illustrated by calculating the fields in a modulated half-space and in a finite slab. Author

Descriptors:

• *ELECTROMAGNETIC RADIATION
• *LIGHT TRANSMISSION
• EQUATIONS OF MOTION
• PARAMETRIC AMPLIFIERS
• TRAVELING WAVE TUBES
• PLASMAS(PHYSICS)
• PERTURBATION THEORY
• ASYMPTOTIC SERIES
• PROPAGATION

Subject Categories:

• Optics
• Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE