Fabrication and Performance of a Heterogeneous-Helical-Cladding Fiber

Xiao Shen,Sheng Chen,Zijun Yang,Liaolin Zhang,Wei Wei,Guangli Yang

doi:10.1109/jphot.2021.3103668

Xiao Shen, Sheng Chen + Show 4 more

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Large mode area (LMA) fibers are widely used in high power fiber lasers to solve the nonlinear problems. In this work, a Nd 3+ -doped phosphate glass LMA fiber with heterogeneous helical claddings (HHC) is fabricated successfully by rod in tube method for the first time. The performance of the preform glass was matched well and suitable for drawing the fiber, and the related fabrication method is helpful for other special structure fiber fabrication. The fiber performance such as loss and gain coefficients are both tested and compared respectively. The experiment results show that the loss coefficient <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">α will increase with the decrease of <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Λ (helix pitch) or <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">r (fiber core radius), furtherly, the net gain coefficient <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">g will become larger with the increase of <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">r or <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Λ . The experiment results are beneficial to the HHC fiber design furtherly. As the HHC fiber has an all-solid-state structure, it is easy to fabricate relatively and convenient for cutting, splicing, etc. Thus, the HHC fiber will have potential applications in the field of fiber lasers.

Highlights

H IGH power fiber lasers have achieved rapid development in the past two decades because of many outstanding features, such as better thermal management, superior beam quality, high wall-plug efficiency, and enhanced flexibility [1]
The heterogeneous helical claddings (HHC) fiber was fabricated with Nd3+-doped phosphate glass
The fiber core diameter varies from 100 μm to 250 μm for each helix pitch (Λ1 is 3.50 cm and Λ2 is 5.25 cm, respectively). θ is 35° and r: R1:R2≈1:2:3

Summary

INTRODUCTION

H IGH power fiber lasers have achieved rapid development in the past two decades because of many outstanding features, such as better thermal management, superior beam quality, high wall-plug efficiency, and enhanced flexibility [1]. GG-IAG fiber was first proposed by A.E. Siegman in 2003, the fiber structure is as simple as traditional fiber, the leakage loss coefficient of LP11 mode is 2.54 times that of LP01 mode [17], the largest fiber core diameter of which is 400 μm with quasi single mode operation [18], and is far larger than that of all the LMA fibers described above. The SHC fiber is difficult to prepare, because it has more segmented claddings needed to filter out higher order modes (HOMs). Supposing the corresponding central angle of the cladding 2 is θ, the fiber core radius is r, the inner and outer cladding radius is R1 and R2 respectively, the helix pitch is Λ, the light wavelength is λ, the optical power loss coefficient is α, and the fiber length is L

OPTICAL GLASS AND FIBER FABRICATION TECHNIQUE

THE LOSS AND GAIN COEFFICIENTS OF THE HHC FIBER

CONCLUSION