Experiment and research of twins fiber on pump coupling efficiency and thermal management

Liang Rong; Junjiang Ren; Wei Ji; Kan Gao; Yaqian Ding; Jiaxin Qiu; Chengwu Yang

doi:10.1117/12.2547742

18 December 2019 Experiment and research of twins fiber on pump coupling efficiency and thermal management

Liang Rong, Junjiang Ren, Wei Ji, Kan Gao, Yaqian Ding, Jiaxin Qiu, Chengwu Yang

Proceedings Volume 11340, AOPC 2019: Optical Fiber Sensors and Communication; 1134018 (2019) https://doi.org/10.1117/12.2547742
Event: Applied Optics and Photonics China (AOPC2019), 2019, Beijing, China

Abstract

In recent years, the power level of laser outputting from twins fiber, being of pump unit fiber and gain unit fiber, is continuing rising. However, little report is focused on the pump coupling efficiency and thermal management on account of the distinctive waveguide of twins fiber. In this paper, the experiment study was launched on pump coupling efficiency and thermal management based on our previous work. To facilitate observing, two waveguides were designed as “cycle pump unit + octagonal gain unit” and “cycle pump unit + cycle gain unit”, while both gain units contained no doping core and the claddings were all 125 um approximately. It indicated that the pump power proportion between pump unit and gain unit was gradually changing with increasing of fiber length when the fiber was pumped from only one side of pump unit. The dynamic balance of pump power proportion could be obtained as the length of “cycle pump unit + octagonal gain unit” twins fiber is more than 4 m. By contrast, the balance point appeared earlier for “cycle pump unit + cycle gain unit” twins fiber before the length was up to 4 m. Further, the laser experiment was executed by using typical twins fiber that was consisted of one octagonal gain unit, containing Ytterbium (Yb) doped fiber core, and cycle pump unit. When the power was pumped into the fiber from the pump unit, the temperature of pumping point was obviously lower than conventional double cladding active fiber.

Citation Download Citation

Liang Rong, Junjiang Ren, Wei Ji, Kan Gao, Yaqian Ding, Jiaxin Qiu, and Chengwu Yang "Experiment and research of twins fiber on pump coupling efficiency and thermal management", Proc. SPIE 11340, AOPC 2019: Optical Fiber Sensors and Communication, 1134018 (18 December 2019); https://doi.org/10.1117/12.2547742

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KEYWORDS

Fiber lasers

Thermal efficiency

Cladding

Waveguides

Fiber couplers

Quartz

Doping

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