Abstract
Based on the structure of the long fiber laser (YDCFLs) with different pump schemes using high pump power, the nonlinear coupled and heat dissipation equations are solved numerically. Using the finite-difference method, we have determined the temperature distribution along the radial and axial directions of the fiber laser (YDCFLs) for the forward pump schemes of 200 W with reflection Rp2, backward pump schemes of 200 W with reflection Rp1 and for bidirectional pump scheme of 100 W each side. The results are: the temperature distribution for bidirectional pump mode is more even than that for forward pump with reflection Rp2 and than that for backward pump with reflection Rp1. The results show that the maximum temperature difference between different schemes is 57.51°C, and when the air-clad width decreases, the temperature in the core regions also decreases and does not affect to the cladding radius regions. We summarize that the temperature in the core and in cladding radius regions decreases when the outer radius cladding increases.
Highlights
The double-clad fiber laser (DCFLs) have several applications in modern telecommunication, medical instruments, military, defense and material surface processing, because of some unique advantages including high conversion efficiency, excellent beam quality, less thermal effect [1,2,3]
A new type of photonic crystal fibers (PCFs) has opened numerous axes in research; this is due to its unique properties such as endlessness
We have investigated numerically the theoretical and numerical analysis of 2D Temperature field by solving the transient heat conduction equations comparing in detail the temperature distributions in the backward pump schemes with Rp1, forward pump schemes with Rp2 and bidirectional pump scheme
Summary
The double-clad fiber laser (DCFLs) have several applications in modern telecommunication, medical instruments, military, defense and material surface processing, because of some unique advantages including high conversion efficiency, excellent beam quality, less thermal effect [1,2,3]. The backward pumped YDCFL with Rp1 = 0.98 has the highest conversion efficiency; while the forward pumped YDCFL with Rp2 = 0.98 has maximum output power per meter. We have investigated numerically the theoretical and numerical analysis of 2D Temperature field by solving the transient heat conduction equations comparing in detail the temperature distributions in the backward pump schemes with Rp1, forward pump schemes with Rp2 and bidirectional pump scheme. The results show that the maximum temperature in the two-end pump is 96.89 ̊C, in the forward pump is 148.4 ̊C and in the backward pump is 154.4 ̊C. The temperature distributions for two-end pump mode is more even than that for forward pump with reflection Rp2 = 0.98 and backward pump with reflection Rp1 = 0.98 mode
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