Accession Number : AD0622575

Title :   ULTRASONIC LASER MODULATION TECHNIQUES.

Descriptive Note : Final rept. for 1 Jul 64-30 Jun 65,

Corporate Author : UNITED AIRCRAFT CORP EAST HARTFORD CONN RESEARCH LABS

Personal Author(s) : DeMaria,A. J. ; Flinchbaugh,D. E. ; Danielson,G. E. ,Jr.

Report Date : 30 JUN 1965

Pagination or Media Count : 133

Abstract : The feasibility of internally modulating the output of solid-state lasers without having to insert lossy elements into the Fabry-Perot feedback interferometer has been demonstrated by the propagation of focused acoustic waves within a glass laser rod. These studies have shown that the establishment of an alternating convergingdiverging waveguide effect by the propagation of acoustic waves within the laser interferometer results in gating of a Nd(3+) glass laser at the acoustic frequency, an increase in output energy by as much as 100%, and an absence of discrete axial modes under gating conditions. The complexity of the integral equations describing the slope and trajectories of light rays traversing various periodic refractive index variations generated by acoustic waves led to the use of analog computer techniques for solving three differential equations for the slope and trajectories of the light rays. The use of the slope solutions for designing a Fabry-Perot laser interferometer configuration for pulse shaping the output of laser oscillators is described. The trajectory solutions describe the operation of the converging-diverging waveguide modulation effect within the laser's interferometer.

Descriptors :   (*LASERS, MODULATION), (*LIGHT TRANSMISSION, MODULATION), (*ULTRASONIC RADIATION, MODULATORS), (*MODULATORS, ULTRASONIC RADIATION), OPTICS, ACOUSTICS, REFRACTION, DIFFRACTION, MATHEMATICAL MODELS, ANALOG COMPUTERS, INTERFEROMETERS, NEODYMIUM, GLASS, OSCILLATORS

Distribution Statement : APPROVED FOR PUBLIC RELEASE