Title :
Mode instability in Yb3+-doped fiber amplifiers of continuous and pulsed signal
Author :
Vershinin, O. ; Tyrtyshnyy, V. ; Kuznetsov, Maxim ; Antipov, Oleg
Author_Institution :
NTO IRE-Polus, Fryazino, Russia
fDate :
June 30 2014-July 4 2014
Abstract :
Spatio-temporal instability of fundamental mode in Yb3+-doped large mode area polarization-maintaining fiber amplifiers was analyzed. Limitations of the amplifier output power and gain were investigated depending on the input signal parameters: spectral width, power level and polarization. The influence of backward reflection of the optical waves on the mode-instability threshold was also examined. The traveling electronic and thermal refractive index gratings following the optically-induced population gratings were found to provide the energy transfer from the main mode to the higher-order modes.
Keywords :
diffraction gratings; laser modes; laser stability; optical fibre amplifiers; optical fibre polarisation; refractive index; spatiotemporal phenomena; spectral line breadth; ytterbium; Yb3+-doped large mode area polarization-maintaining fiber amplifiers; amplifier gain; amplifier output power; backward reflection; continuous signal; energy transfer; fundamental mode; higher-order modes; input signal parameters; mode-instability threshold; optical waves; optically-induced population gratings; power level; pulsed signal; spatiotemporal instability; spectral width; thermal refractive index gratings; traveling electronic refractive index gratings; Optical fiber amplifiers; Oscillators; Power amplifiers; Power generation; Stimulated emission; LMA fibers; Mode instability; Yb3+;
Conference_Titel :
Laser Optics, 2014 International Conference
Conference_Location :
Saint Petersburg
Print_ISBN :
978-1-4799-3884-1
DOI :
10.1109/LO.2014.6886480
