Investigation of Self Pulsing in Ytterbium-Doped High Power Fiber Amplifiers

Panbiharwala, Yusuf; Kumar, C. Ramesh; Venkitesh, Deepa; Srinivasan, Balaji

doi:10.1364/photonics.2012.tpo.15

Cited by 2 publications

(3 citation statements)

References 3 publications

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“…The output signal increases nonlinearly against input signal and obviously elevates at higher pump powers, too. The scattered data emphasizes the input/output signals extracted from the numerical simulation of the coupled rate equations, while the solid curves attest the Frantz-Nodvik analytical amplification relation given by equation (15). According to the best fitting of the scattered data by means of the least squares method, the γ 0 and P sat values are well determined.…”

Section: Resultsmentioning

confidence: 64%

“…The optimization, under co-directional pumping, seed laser and the fiber length, has been carried out in an MOPA array using a Yb -doped DC single mode Nufern fiber laser [13]. The self-pulsing of a high power Yb-doped fiber amplifier in the MOPA configuration has also been reported [15]. Moreover, a high energy QSW Yb-doped fiber laser at ∼1064 nm in an MOPA array has been empirically examined [16].…”

Section: Introductionmentioning

confidence: 99%

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Modeling of a Q-switched master oscillator power amplifier fiber laser and gain saturation properties

2020

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Here, a model is developed for a master oscillator power amplifier of a Q-switched double-clad ytterbium--doped fiber laser, based on time -dependent coupled rate equations by virtue of the finite difference method. At first, the master oscillator is modeled with various rise times and its effect on the output peak power and pulse duration is investigated. The output pulse is characterized in terms of input pump power, dopant concentration, fiber length and core diameter. Then, the power amplifier (PA) is modeled to determine the input/output signals via the numerical solution of the coupled rate equations. The best fitting of data is performed over the analytical amplification relation by making use of the least squares method in order to find the gain and saturation parameters. Eventually, the small signal gain and saturation power are obtained under various parameters such as input pump power, dopant concentration, fiber length and core diameter. The dominant effect of filling factors are also discerned versus core diameters to attain the single mode operation. Finally, the power extracted from a single stage PA is envisaged versus various parameters.

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Section: Resultsmentioning

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Modeling of a Q-switched master oscillator power amplifier fiber laser and gain saturation properties

2020

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“…Still some excess pump power is always present with the added problem of splicing these fibers in an all fiber amplifier or laser setup. To minimise the excess pump power one require to use reasonably longer length of active fiber which introduces nonlinear effects like saturable absorption (SA) due to low pumped region in the active fiber, stimulated Brillouin scattering (SBS), stimulated Raman scattering (SRS) 5,6 . Also the problem of splicing adds loss to the system and sometimes poor coupling of signal resulting in dominance of amplified spontaneous emission (ASE).…”

Section: Introductionmentioning

confidence: 99%

Broadband generation by multiple four-wave mixing process due to ASE Q-switching in high-power double-clad ytterbium-doped fiber amplifier

et al. 2014

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Broadband output from 1060nm to 1700nm and cascaded four-wave mixing generated red light pulsing is observed in a fiber amplifier set up consisting of a 5.5m double clad, double D shaped Ytterbium doped fiber, a single clad passive fiber for excess pump absorption and a splitter, both with and without a CW seed. Self-pulsing occurs from ASE due to passive Q-switching by saturable absorption effect of the active fiber and also depends on splice loss. The pulses generate broadband output by multiple four-wave mixing process with maximum broadening efficiency near 1300nm which is the zero dispersion wavelength for silica fiber. Pulses traveling both in forward and backward direction have enough peak power and energy to damage splice points and fiber components. When seeded the self-pulsing and broadband generation is often suppressed but again generate at increased pump powers.

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Investigation of Self Pulsing in Ytterbium-Doped High Power Fiber Amplifiers

Cited by 2 publications

References 3 publications

Modeling of a Q-switched master oscillator power amplifier fiber laser and gain saturation properties

Modeling of a Q-switched master oscillator power amplifier fiber laser and gain saturation properties

Broadband generation by multiple four-wave mixing process due to ASE Q-switching in high-power double-clad ytterbium-doped fiber amplifier

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