Heat dissipation model and temperature distribution of Yb-doped double-clad fiber in the composite system

Lv, Yi; Liu, Sheng

doi:10.1016/j.yofte.2020.102269

Cited by 1 publication

(1 citation statement)

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“…Due to the excitation and amplification of high-order modes in the LMA fiber, the accumulated heat load would ultimately result in the energy transferring between various modes and lead to mode instability (MI), challenging the further power scaling of lasers [18], [19]. Accordingly, numerous researches have studied the heat dissipation problems in YDFLs theoretically and experimentally, such as the influences of pump directions or pump distributions [20]- [22], and the packing structure of the fiber [23]. Based on the analytical results, high-power experiments have been carried out with resonator [24] and amplifier configurations [25], discussing the cooling methods including air cooling or copper heat sink.…”

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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