Journal
FIBER LASERS XI: TECHNOLOGY, SYSTEMS, AND APPLICATIONS
Volume 8961, Issue -, Pages -Publisher
SPIE-INT SOC OPTICAL ENGINEERING
DOI: 10.1117/12.2039869
Keywords
Fiber laser; High Power; Fiber Bragg Gratings; Nonlinear effects; Stimulated Raman Scattering; Self-Phase Modulation; Nonlinear Schrodinger Equation
Funding
- Federal Ministry of Education and Research (BMBF) [13N11972]
- Thuringian Ministry for Economy, Labour and Technology (TMWAT) [2011 FGR 0103]
- European social Fund (ESF)
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In this paper the threshold for Stimulated Raman scattering (SRS) is analyzed experimentally and theoretically for monolithic LMA cw kW fiber oscillators. Four oscillators with different spectral widths of the low reflecting (LR) Fiber Bragg Gratings (FBG) (0.04 nm, 0.5 nm, 1.5 nm (FWHM) and without LR grating) were characterized. Experimental it was found that the threshold of SRS depends on the spectral width of the out coupling FBGs, which is not yet understood completely. Attempts to describe such lasers by simulations are based on the nonlinear Schrodinger equation supporting spectral broadening of cw-fiber laser, rate equation gain as well as broadband Raman gain. The experimental results and the simulations were compared and discussed.
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