Date of Award
12-17-2001
Document Type
Dissertation
Degree Name
Doctor of Philosophy (PhD)
Department
Department of Engineering Physics
First Advisor
Won B. Roh, PhD
Abstract
The influence of stimulated scattering on laser intensity in fiber optic waveguides is examined. Stimulated Brillouin scattering (SBS) in long, multimode optical waveguides is found to generate a Stokes beam that propagates in the fiber LP01 mode. Additionally, the same process is found to combine multiple laser beams into a single spatially coherent source. Limitations in beam cleanup and combining are also investigated to identify ways to overcome them. The last portion of the dissertation theoretically examines suppression of stimulated Raman scattering in fibers to eliminate the restriction this imposes on the power of a fiber laser or amplifier. The suppression was modeled using both a holmium dopant and adding a long period grating to the fiber. Both methods were shown to have a significant effect on the SRS threshold.
AFIT Designator
AFIT-DS-ENP-02-3
DTIC Accession Number
ADA398033
Recommended Citation
Russell, Timothy H., "Laser Intensity Scaling through Stimulated Scattering in Optical Fibers" (2001). Theses and Dissertations. 4356.
https://scholar.afit.edu/etd/4356