Abstract
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.
Highlights
High power fiber lasers (HPFLs) are currently under intense investigations benefiting from eminent advantages such as good beam quality, high conversion efficiency, small footprint and excellent reliability [1], [2]
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
The results show that the amplifier is superior to the resonator in heat alleviation, and the forward pumping scheme is 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
Summary
High power fiber lasers (HPFLs) are currently under intense investigations benefiting from eminent advantages such as good beam quality, high conversion efficiency, small footprint and excellent reliability [1], [2]. 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. This is even worse when the large mode area (LMA) fiber is commonly employed. The simulation shows that the amplifier is superior to the resonator according to heat alleviation, and the forward pumping scheme is beneficial to ease the thermal load than the backward and bidirectional pumping schemes This is the first demonstration of thermal analysis of RFL system, which offers insight into the thermal effect suppression and further power scaling of RFLs. In Section 2, we begin with the conventional model of Raman fiber amplifier and resonator configurations.
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