Advanced High-Power Near-Infrared Fiber Lasers
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 15, 2005
- Accession Number
- ADA439073
Entities
People
- Anca Mocofanescu
- Ravinder Jain
Organizations
- University of New Mexico