Limit of Effective Area for Single-Mode Operation in Step-Index Large Mode Area Laser Fibers

Li, Mingjun; Chen, Xin; Liu, Anping; Gray, S.; Wang, Ji; Walton, Donnell T.; Zenteno, L.A.

doi:10.1109/jlt.2009.2020682

Cited by 125 publications

(25 citation statements)

References 13 publications

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“…Then the MI threshold as a function of the diameter of the 1st coil in figures 2(b) and (c) is calculated based on the bend loss data in figure 2(a), and the spiral increment Δ is 1.5 mm. The smallest diameter of the 1st coil is set to 10 cm to guarantee long time operation [30,31]. In figures 2(b) and (c), the red dashed line marked the MI threshold corresponding to the case without bend loss.…”

Section: Theoretical Resultsmentioning

confidence: 99%

Suppressing mode instabilities by optimizing the fiber coiling methods

Tao

et al. 2016

Laser Phys. Lett.

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Suppressing mode instabilities (MI) by optimizing the fiber coiling methods has been studied numerically. By employing our semi-analytical model, the MI threshold of two typical high power fibers in various coiling methods has been calculated. It reveals that fiber laser systems with gain fibers being coiled in cylinder shape has higher MI threshold than those with gain fibers being coiled in spiral shape, and MI-free output power of fiber lasers can be scaled up to above 3 kW even with the typical commercial fibers in the co-pumped configurations.

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Section: Theoretical Resultsmentioning

confidence: 99%

Suppressing mode instabilities by optimizing the fiber coiling methods

Tao

et al. 2016

Laser Phys. Lett.

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“…According to Ref. [31], single-mode operation can be realized when the FM loss is lower than 0.1 dB/m but HOMs losses are greater than 10 dB/m. While based on TIA-455-80-C standard, the single-mode operation of a fiber is defined as the condition that the HOMs are suppressed by 19.3 dB [32].…”

Section: Refractive Index Profile Under Heat Load and Bendingmentioning

confidence: 99%

Thermally Induced Mode Amplification Characteristics of Large Mode Area Segmented Cladding Fiber

et al. 2021

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A model of amplifier based on large mode area (LMA) segmented cladding fiber (SCF) is proposed. High order modes (HOMs) filtering effect and thermal-induced modal evolution characteristics are theoretically investigated by the few-mode steady state rate equations and heat conduction equation. Simulation results show that an amplifier based on ytterbium doped SCF presents much better HOMs suppression and mode beam quality than the amplifier based on conventional step-index fiber when achieving single-mode operation by coiling fiber. Furthermore, heat load generating in the core of ytterbium doped SCF can change the pre-designed refractive index profile through the thermo-optic effect, which induces evolution of mode amplification characteristics, including mode loss decreasing and mode area shrinking. And the co-pumping amplifier ytterbium doped SCF is more advantageous to get large mode area of fundamental mode at the output end, while single-mode operation is achieved much more effectively in the counter-pumping amplifier. These results can provide guidance in the design of high-power single-mode fiber amplifier based on rare-earth doped LMA-SCF.

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“…Although it is easy to increase the mode-field area by increasing the core diameter, the mode-field area of an SMF is limited by the condition of single-mode operation. 2 To overcome the limits of the transmission capacity of SMFs, few-mode optical fibers (FMFs) have been proposed for optical communication applications. Currently, the FMF-based communication technology can be divided into two categories.…”

Section: Introductionmentioning

confidence: 99%