Theoretical analysis of multimode fiber amplifiers and lasers containing spatial filters

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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“…Here, the mode field ψ (r, φ) can be expresse d by the Bessel function, which for a doped DC fiber can be approximated by [46,47]:…”

Section: Theorymentioning

confidence: 99%

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

2020

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“…On the contrary, the signal filling factor provides a figure of interaction between the optical modes at the signal radiation and the dopant ions profile. The spatial overlap integral due to the signal indicates that [25,40,41] ( )…”

Section: Rate Equationsmentioning

confidence: 99%

“…Apparently, Γ s is a function of the pump intensity which approaches a saturated value at high pumping rates [42]. Furthermore, I core and I clad are defined as the intensity confined in the core and inner cladding, respectively [25], which can be theoretically expressed as follows [41]:…”

Section: Rate Equationsmentioning

confidence: 99%

Gain Saturation in Optical Fiber Laser Amplifiers

Eilchi¹,

Parvin²

2016

Fiber Laser

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“…The pump/signal filling factor (Γ p /Γ s ) represents the interaction between the pump fields distribution/signal modes and the dopant ions, which for DC fibers with the core radius a, can be approximated by [10,11] …”

Section: Theorymentioning

confidence: 99%

Effect of pump power on gain and saturation of double-clad fiber amplifiers

Ilchi-Ghazaani

Parvin

Mohammadian

et al. 2013

2013 21st Iranian Conference on Electrical Engineering (ICEE)

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Designing and fabrication of a continuous wave double-clad oscillator-amplifier array was carried out in order to measure the small-signal gain and saturation power. In the array, the low power fiber laser seed signal at 1082.5nm is amplified through the single-mode double-clad ytterbiumdoped silica fiber amplifier. The gain and saturation parameters can be determined using the steady-state amplification relation. It is shown that those parameters increase at stronger pump powers of the amplifier mainly due to the dominant effect of the overlapping factor.

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Theoretical analysis of multimode fiber amplifiers and lasers containing spatial filters

Cited by 5 publications

References 22 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

Gain Saturation in Optical Fiber Laser Amplifiers

Effect of pump power on gain and saturation of double-clad fiber amplifiers

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