Abstract
A novel structure of modified multi-trench fiber (MTF) with characteristics of bend-resistance and large mode-area is proposed. In this structure, each low refractive-index trench of traditional MTF is broken by two gaps up and down. Numerical investigations show that the mode field area of 840 μm2 can be achieved with effective single-mode (SM) operation when the bending radius is 15 cm. Moreover, the high order mode (HOM) suppression of the proposed design is better than that of standard MTF. The SM operation property can be enhanced with the decreases of bending radius. The proposed design shows great potential in high power fiber lasers with compact structure.
Highlights
Over the last decades, high power fiber lasers have developed rapidly due to their beam quality, heat dissipation, brightness, operating costs and efficiency [1,2,3]
To eliminate the challenges induced by high power output, large mode area (LMA) fibers have become the preferred choice
It is important for high power fiber lasers to achieve LMA and effective singlemode (SM) operation simultaneously
Summary
High power fiber lasers have developed rapidly due to their beam quality, heat dissipation, brightness, operating costs and efficiency [1,2,3]. To eliminate the challenges induced by high power output, large mode area (LMA) fibers have become the preferred choice. A large number of transverse modes always lead to the mode competition and instability of output [4, 5] It is important for high power fiber lasers to achieve LMA and effective singlemode (SM) operation simultaneously. Rod MTFs can achieve large mode area and excellent high-order modes (HOMs) suppression capability [19]. The loss ratio between lowest-HOM and fundamental mode (FM) is more than 300 with the mode area of 840 μm under bending radius of 15 cm. The finite element method (FEM) is used in complex fiber structure analysis due to its high calculation precision. Loss(LP01) refers to the loss of LP01 mode, Loss(LP11v) refers to the loss of LP11v mode, Loss(LP11h) refers to the loss of LP11h mode
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