Accession Number : AD0283350

Title :   RADIATION PATTERNS AND AXIAL MODES OF RUBY LASERS

Corporate Author : AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS

Personal Author(s) : STICKLEY,C.M. ; BRADBURY,R.A.

Report Date : JUN 1962

Pagination or Media Count : 1

Abstract : AD-283 350Div. 25 U (TISTP/JW) OTS price $4.60Air Force Cambridge Research Labs., Bedford, Mass. RADIATION PATTERNS AND AXIAL MODES OF RUBY LASERS, by C. M. Stickley and R. A. Bradbury. June 62, 40p. incl. illus. tables, refs. (Rept. no. AFCRL 62-386) (Proj. 4645) Unclassified report DESCRIPTORS: *Lasers, *Radiation effects, Crystals, Optics, Rings, Errors, Reliability, Beams, Rods, Ruby. Identifiers: Fairfield r diation patterns. The present state of the art in optical processing of the flat ends of the ruby laser rod can seriously limit the performance of the laser; however, if the crystal is basically of poor quality, improvement of the flatness and parallelism of the ends will have little effect on its beamwidth and near and farfield radiation pattern. This has been verified by experiment. Farfield radiation patterns are partially understood in that they are Fabry-Perot patterns; ring patterns from all axial modes virtually overlap; and the rings are wide partially due to optical pat -length v ri tio in the crystal. If optical path-length differences through the laser rod of greater than one wavelength exist, a Fabry-Perot ring pattern will not develop in the far field, but the radiation will still be partially coherent as determine by performing Young's experiment. The axial modes in r by have been separated optically and their separation agrees with basic theory within the limits of experimental error. (Author)

Descriptors :   *LASERS, *RADIATION EFFECTS, BEAMS (ELECTROMAGNETIC), BEAMS (STRUCTURAL), CRYSTALS, ERRORS, OPTICS, RELIABILITY, RINGS, RODS

Distribution Statement : APPROVED FOR PUBLIC RELEASE