Analysis of laser efficiency and thermal effects in kilowatt fiber lasers based on distributed side-coupled fibers

Xinglong He; Lei Liao; Fangfang Zhang; Yisha Chen; Jinggang Peng; Luyun Yang; Nengli Dai; Haiqing Li; Jinyan Li

doi:10.1117/1.OE.57.9.096108

24 September 2018 Analysis of laser efficiency and thermal effects in kilowatt fiber lasers based on distributed side-coupled fibers

Xinglong He, Lei Liao, Fangfang Zhang, Yisha Chen, Jinggang Peng, Luyun Yang, Nengli Dai, Haiqing Li, Jinyan Li

Author Affiliations +

Optical Engineering, Vol. 57, Issue 9, 096108 (September 2018). https://doi.org/10.1117/1.OE.57.9.096108

Abstract

The laser efficiency and temperature distribution in distributed side-coupled cladding-pumped (DSCCP) fiber lasers are investigated, using a precise and complete analytic model. We show that high-order mode pump handling and (N + 1) (N ≥ 2) DSCCP fibers can achieve a high laser efficiency when the fibers are separated. In terms of multistage pump schemes, a high laser efficiency requires an appropriate pump-node number and arrangement. According to our calculations, the temperature evolution along the signal fiber could give rise to a fluctuation in the case of strong coupling, which could decrease the mode instability threshold. The fluctuation period is usually determined by the DSCCP structure including the pump fiber number, the fiber diameter, and the fiber spacing. It is suggested that the mode instability threshold can be depressed through excellent DSCCP structure design and the selection on an appropriate pump scheme.

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Xinglong He, Lei Liao, Fangfang Zhang, Yisha Chen, Jinggang Peng, Luyun Yang, Nengli Dai, Haiqing Li, and Jinyan Li "Analysis of laser efficiency and thermal effects in kilowatt fiber lasers based on distributed side-coupled fibers," Optical Engineering 57(9), 096108 (24 September 2018). https://doi.org/10.1117/1.OE.57.9.096108

Received: 16 January 2018; Accepted: 9 August 2018; Published: 24 September 2018

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