Temporal dynamics of mode instabilities in high-power fiber lasers and amplifiers | Zendy

Hans-Jürgen Otto | Zendy; Fabian Stutzki | Zendy; Florian Jansen | Zendy; Tino Eidam | Zendy; César Jáuregui | Zendy; Jens Limpert | Zendy; Andreas Tünnermann | Zendy

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Temporal dynamics of mode instabilities in high-power fiber lasers and amplifiers

Author(s) -

Hans-Jürgen Otto,

Fabian Stutzki,

Florian Jansen,

Tino Eidam,

César Jáuregui,

Jens Limpert,

Andreas Tünnermann

Publication year - 2012

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.20.015710

Subject(s) - optics , instability , mode (computer interface) , physics , mode locking , equilibrium mode distribution , fiber laser , amplifier , photodiode , laser , single mode optical fiber , radiation mode , mechanics , optoelectronics , cmos , computer science , operating system

The temporal behavior of mode instabilities in active large mode area fibers is experimentally investigated in detail. Thus, apart from the onset threshold of mode instabilities, the output beam is characterized using both high-speed camera measurements with 20,000 frames per second and photodiode traces. Based on these measurements, an empiric definition of the power threshold of mode instabilities is introduced. Additionally, it is shown that the temporal dynamics show a transition zone between the stable and the unstable regimes where well-defined periodic temporal fluctuations on ms-timescale can be observed. Finally, it is experimentally shown that the larger the mode-field area, the slower the mode-instability fluctuation is. The observations support the thermal origin of mode instabilities.

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