Breaking the Stringent Trade-Off Between Mode Area and NA for Efficient High-Power Fiber Lasers Around 2 μm

Jain, Deepak; Sahu, J.K.; Fleming, Simon

doi:10.1109/jlt.2020.3010814

Cited by 6 publications

(2 citation statements)

References 42 publications

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“…This kind of optimization for controlling thickness and RI at different regions of the core makes it a more promising method for the development of specialty fibers with complex RI profiles such as M-type fiber, parabolic fiber, etc. [33][34][35][36][37][38][39][40]…”

Section: Resultsmentioning

confidence: 99%

Novel Dopant Tailored Fibers Using Vapor Phase Chelate Delivery Technique

Choudhury

Chowdhury

et al. 2021

Physica Status Solidi (a)

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The vapor phase chelate delivery (VPCD) technique in conjunction with the modified chemical vapor deposition (MCVD) process is adopted to fabricate fibers with customized doping profiles. The three large‐mode area (LMA) step‐index fibers with different rare‐earth doping profiles in the core region, such as uniform doping, centralized doping, and circumferential doping, are fabricated by optimizing the fabrication parameters. The fibers are tested in a cladding‐pumped amplifier configuration and their output beam qualities and signal‐to‐noise ratio (SNR) are characterized. The investigation reveals that the fiber with centralized doping in the core region exhibits lower M 2 compared with the fibers with uniform and circumferential doping, as it has a lower overlap of the higher‐order modes with the doped region. The experimental result is further affirmed through theoretically simulated results. The developed fabrication technique shows potential to fabricate specialty fibers of varied designs, where customized doping profiles are required.

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Section: Resultsmentioning

confidence: 99%

Novel Dopant Tailored Fibers Using Vapor Phase Chelate Delivery Technique

Choudhury

Chowdhury

et al. 2021

Physica Status Solidi (a)

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“…The output power exceeded 10 kW in 2010, just six years after the first demonstration of the 1 kW output laser [6]. However, the further increase of the output power is limited by detrimental phenomena such as optical nonlinear effect, thermal damage, mode instability, and photodarkening [7][8][9][10][11][12][13]. Among these harmful effects, the nonlinear effect is an urgent problem to be solved.…”

Section: Introductionmentioning

confidence: 99%

Segmented Cladding Fiber With a High-Index Ring in Core for Wideband Single-Mode Operation in Any Bending Orientation

Guo

Ning

et al. 2021

IEEE Photonics J.

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A resonant-ring-assisted large mode area segmented cladding fiber (RR-SCF) with a high-index ring in the core is proposed. Numerical investigations of the effects of the high-index ring on the leakage losses of guiding modes, mode area, and electric field distribution of FM in the proposed fiber show the high-index ring not only increases the ratio of the loss between the fundamental mode (FM) and the higher-order modes (HOMs) but also improves the electric field distribution of the FM to be flat. By taking these advantages of the high-index-ring-assisted core, the effective single-mode (SM) operation is achieved in the proposed fiber bent in any orientation, which makes up the defect of the conventional RR-SCF that the SM output is affected by the bending orientation. Meanwhile, the mode area is enlarged. Furthermore, the effects of the heat load, duty cycle, bending, and operation wavelength on the fiber performance are analyzed. The results show single-mode operation in all bending orientations with a mode area larger than 824 μm 2 can be achieved at a tight bending radius of 15 cm to 16 cm when the operating wavelength ranges from 1.06 μm to 1.76 μm. This fiber shows great potential in high-power fiber lasers.

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