Research Experimentation for Space and Counter-UxVs Engagement (RESCUE)
Abstract
There has been an increasing demand for high-power fiber amplifiers for defense applications. The maximal output power achievable for continuous-wave (CW) fiber amplifiers is currently limited by the transverse mode instability (TMI). Previous works have pursued single- or few-mode operation as the only route to achieving stable amplification with good beam quality. We propose a paradigm shift from single-mode to highly multimode amplification. A coherent excitation of many fiber modes will efficiently mitigate the thermo-optical nonlinearity and transverse mode instability in a multimode fiber (MMF) amplifier. Our numerical and theoretical studies show that the TMI threshold power scales linearly with the number of equally excited modes in a fiber. The output beam can be focused to a diffraction-limited spot by shaping the input wavefront.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Feb 05, 2025
- Source ID
- FA95502410034
Entities
People
- John Crassidis
Organizations
- Air Force Office of Scientific Research
- Research Foundation for the State University of New York
- United States Air Force