Analysis of Steady-State Brillouin Nonlinearity in High-Power Fiber Lasers
الموضوعات : فصلنامه نانوساختارهای اپتوالکترونیکی
1 - Photonics and Quantum Technologies Research School, Nuclear Science and Technology Research Institute (NSTRI)
الکلمات المفتاحية: Efficiency, Nonlinear Effect, Double-Clad Fibers, Stimulated Brillouin Scattering, Threshold Power, Unidirectional Pumping Mode,
ملخص المقالة :
In the present work, a theoretical analysis of the first-order of stimulated
Brillouin scattering (SBS) in a double-clad (DC) ytterbium (Yb)-doped silica fiber laser
in unidirectional pumping mode is presented.
An accurate simulation for calculating SBS nonlinearity is performed by considering the
coupled differential rate equations for pump, signal and Stokes powers, as well as
population inversion under the initial and boundary conditions in a typical all fiberbased
laser with kW-range.
In order to improve the laser operation and increase the laser efficiency, the dependence
of different parameters of the laser cavity such as active fiber length, fiber core
diameter, dopant concentration, output mirror reflectivity at signal wavelength, as well
as the laser linewidth on the Brillouin threshold power has been studied.
In addition, numerical analysis has been compared with the approximate analytical
solution presented to emphasize the validity of modeling.
As a result, the proposed laser design can generate up to 2.5 kW of output power
without the onset of SBS.
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