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intensity noise as a driver for transverse mode instability in fiber amplifiers

PhotoniX 2020年第1期1卷 245-261页

作者： Christoph Stihler Cesar Jauregui Sobhy E.Kholaif Jens Limpert Institute of Applied Physics Abbe Center of PhotonicsFriedrich-Schiller-Universität JenaAlbert-Einstein-Str.1507745 JenaGermany Fraunhofer Institute for Applied Optics and Precision Engineering Albert-Einstein-Str.707745 JenaGermany Helmholtz-Institute Jena Fröbelstieg 307743 JenaGermany.

The effect of transverse mode instability (TMI) is currently the main limitation for thefurther average-power scaling of fiber laser systems with diffraction-limited beamquality. In this work a main driving force for TMI in fiber amplifiers is identified. Ourexperiments and simulations illustrate that the performance of fiber laser systems interms of their diffraction-limited output power can be significantly reduced whenthe pump or seed radiation exhibit intensity noise. This finding emphasizes the factthat the TMI threshold is not only determined by the active fiber but, rather, by thewhole system. In the experiment an artificially applied pump intensity-noise of 2.9%led to a reduction of the TMI threshold of 63%, whereas a similar seed intensitynoisedecreased it by just 13%. Thus, even though both noise sources have animpact on the TMI threshold, the pump intensity-noise can be considered as themain driver for TMI in saturated fiber amplifiers. Additionally, the work unveils thatthe physical origin of this behavior is linked to the noise transfer function insaturated fiber amplifiers. With the gained knowledge and the experimental andtheoretical results, it can be concluded that a suppression of pump-noise frequenciesbelow 20 kHz could strongly increase the TMI threshold in high-power fiber lasersystems.

关键词： Transverse mode instability Fiber lasers Thermal effects intensity noise Modal interference Refractive index grating Mode coupling Phase shift

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Stimulated Brillouin scattering-induced phase noise in an interferometric fiber sensing system

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Chinese Physics B 2012年第3期21卷 256-261页

作者：陈伟孟洲周会娟罗洪 Department of Optic Information Science and Technology College of Optoelectronic Science and EngineeringNational University of Defense Technology

Stimulated Brillouin scattering-induced phase noise is harmful to interferometric fiber sensing systems. The localized fluctuating model is used to study the intensity noise caused by the stimulated Brillouin scattering in a single-mode fiber. The phase noise structure is analyzed for an interferometric fiber sensing system, and an unbalanced Michelson interferometer with an optical path difference of 1 m, as well as the phase-generated carrier technique, is used to measure the phase noise. It is found that the phase noise is small when the input power is below the stimulated Brillouin scattering threshold, increases dramatically at first and then gradually becomes flat when the input power is above the threshold, which is similar to the variation in relative intensity noise. It can be inferred that the increase in phase noise is mainly due to the broadening of the laser linewidth caused by stimulated Brillouin scattering, which is verified through linewidth measurements in the absence and presence of the stimulated Brillouin scattering.

关键词： stimulated Brillouin scattering phase noise interferometric fiber sensing intensity noise

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A Four-Element Sensor Array Consisting of Asymmetric Distributed-Feedback Fiber Lasers

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Photonic Sensors 2014年第2期4卷 180-187页

作者： Pengpeng WANG Jun CHANG Cunguang ZHU Boning SUN Guangping LV Sasa ZHANG Yanjie ZHAO Zhihui SUN Xiaolei ZHANG Gangding PENG School of Information Science and Engineering and Shandong Provincial Key Laboratory of Laser Technology andApplication Shandong University Jinan 250100 China Laser Institute of Shandong Academy of Science Jinan 250014 China photonics & Optical Communications Group School of Electrical Engineering & Telecommunications the Universityof New South Wales Sydney 2052 Australia

A sensor array system formed by arranging four asymmetric distributed-feedback fiber lasers （DFB-FL） in ascending order according to their slope efficiencies was proposed. The output flatness could be effectively improved with the application of asymmetric DFB-FLs. The last element had almost the same output with the others although it obtained the smallest pump power. The relative intensity noise （RIN） and relaxation oscillation frequency of the sensor array were also analyzed. It is found that the relaxation oscillation frequency of a certain DFB-FL was relevant to its relative position in the array. And the RIN of a certain DFB-FL was always affected by the other elements in the array, which was not dependent on the order of their arrangement.

关键词： Asymmetric DFB fiber laser sensor array intensity noise relaxation oscillation

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