Accession Number:

ADA439073

Title:

Advanced High-Power Near-Infrared Fiber Lasers

Descriptive Note:

Final rept., 5 Dec 2002-30 Jun 2005

Corporate Author:

NEW MEXICO UNIV ALBUQUERQUE CENTER FORHIGH TECHNOLOGY MATERIALS

Personal Author(s):

Report Date:

2005-09-15

Pagination or Media Count:

34.0

Abstract:

Experiments were conducted to study stimulated Brillouin scattering SBS in optical fibers with a goal of studying its applicability for phase conjugation of radiation from CW lasers, and of using SBS to demonstrate high power fiber lasers by coherent combination of beams from several fiber amplifiers. It was determined that usual plane-wave theory of SBS does not correctly predict the threshold when applied to SBS in single-mode step-index and multimode GRIN fibers. By properly accounting for the mode sizes and modal dispersion in the fibers, good agreement within 15 between experiments and theory was obtained. Good compensation of beam distortion was demonstrated via SBS in long multimode fibers length of the order of 1 km, both with butt-coupling and focusing geometries. We have demonstrated the reduction of the SBS threshold, an increase in the SBS reflectivity and reduction in Stokes power fluctuations for seeded SBS in long multimode fibers. We have demonstrated distortion compensation via beam cleanup in the seeded SBS configuration.

Subject Categories:

  • Lasers and Masers
  • Fiber Optics and Integrated Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE