Controlling mode instabilities by dynamic mode excitation with an acousto-optic deflector.
We demonstrate an approach to actively stabilize the beam profile of a fiber amplifier above the mode instability threshold. Both the beam quality and the pointing stability are significantly increased at power levels of up to three times the mode instabilities threshold. The physical working principle is discussed at the light of the recently published theoretical explanations of mode instabilities.
Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena, Albert-Einstein-Str 15, 07745 Jena, Germany. hans-juergen.otto@uni-jena.de
Hans-Jürgen
HJ
Otto
Cesar
C
Jauregui
Fabian
F
Stutzki
Florian
F
Jansen
Jens
J
Limpert
Andreas
A
Tünnermann
D000669:Amplifiers, Electronic; D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D007909:Lenses; D008027:Light; D008962:Models, Theoretical; D061088:Photoacoustic Techniques / Q000295:instrumentation*; D012542:Scattering, Radiation