Transverse mode instability, thermal lensing and power scaling in Yb<sup>3+</sup>-doped high-power fiber amplifiers

Zervas, M.N.

doi:10.1364/oe.27.019019

Cited by 118 publications

(51 citation statements)

References 39 publications

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“…This original purpose may be difficult to achieve when bending and heat load bring about mode area shrinking. Mode area shrinkage can be analyzed by effective mode area reduction (Ar), which is defined as [30]…”

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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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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“…Materially, waste heat can affect operating wavelength, output power, and lasing threshold, [92][93][94] as well as damage the polymeric fiber coatings and, at extreme levels, lead to thermal fracture of the glass. 71,95 The waveguide properties also are impacted. To lessen the detrimental influence of nonlinearities, highpower laser fibers possess an LMA design, which makes them intrinsically multimoded (even when they operate in an "effectively single mode" regime).…”

Section: Some Like It Hotmentioning

confidence: 99%

“…Remember that, as previously noted, the performance of fibers is dictated both by the materials from which they are made and from their waveguiding structure. Materially, waste heat can affect operating wavelength, output power, and lasing threshold, 92‐94 as well as damage the polymeric fiber coatings and, at extreme levels, lead to thermal fracture of the glass 71,95 . The waveguide properties also are impacted.…”

Section: Recent Advancements and Innovationsmentioning

confidence: 99%

Glass: The carrier of light—Part II—A brief look into the future of optical fiber

Ballato

Dragic

2020

Int J of Appl Glass Sci

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“…Despite the impressive performances of high-power CW YDFLs, there are severe limitations for the further scaling of output power, among which thermal effect is considered as an important issue [13]- [17]. During the high-power operation, the quantum defect brings about the continuous temperature increment in the fiber core, causing thermal-optic effect and influencing the laser transmission.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Analysis of Heat Distribution in Raman Fiber Lasers and Amplifiers Employing Pure Passive Fiber

Chen

Yao

et al. 2020

IEEE Photonics J.

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In this paper, we study the thermal dissipation of Raman fiber laser and amplifier utilizing pure passive fiber as gain medium for the first time. Take into account the convective and conductive heat transferring process in the fiber, we consider the heat transferring and Raman conversion model based on the thermal conduction equations and the Raman coupled equations in the fiber. With the simulation of power distribution, the thermal profiles of Raman fiber laser are analyzed, including the transverse and longitudinal distributions of the heat load density, temperature, and thermal-induced refractive index change in the fiber. Meanwhile, the heat dissipation in multimode graded-index fiber and step-index fiber are also calculated and compared. The results show that the amplifier is superior to the resonator in heat alleviation, and the forward pumping scheme is also better to ease the thermal load than the backward and bidirectional pumping schemes, which have consult meaning for the suppression of thermal effects and the power scaling in Raman fiber lasers.

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Transverse mode instability, thermal lensing and power scaling in Yb³⁺-doped high-power fiber amplifiers

Cited by 118 publications

References 39 publications

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

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

Glass: The carrier of light—Part II—A brief look into the future of optical fiber

Theoretical Analysis of Heat Distribution in Raman Fiber Lasers and Amplifiers Employing Pure Passive Fiber

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Transverse mode instability, thermal lensing and power scaling in Yb3+-doped high-power fiber amplifiers

Cited by 118 publications

References 39 publications

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

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

Glass: The carrier of light—Part II—A brief look into the future of optical fiber

Theoretical Analysis of Heat Distribution in Raman Fiber Lasers and Amplifiers Employing Pure Passive Fiber

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Product

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Transverse mode instability, thermal lensing and power scaling in Yb³⁺-doped high-power fiber amplifiers