Theoretical investigation of mode competition in high-power fiber lasers and amplifiers at 1018nm

Zhaoxin Xie; Wei Shi; Shijie Fu; Jianquan Yao

doi:10.1117/12.2503536

12 December 2018 Theoretical investigation of mode competition in high-power fiber lasers and amplifiers at 1018nm

Zhaoxin Xie, Wei Shi, Shijie Fu, Jianquan Yao

Proceedings Volume 10844, Advanced Laser Technology and Applications; 1084406 (2018) https://doi.org/10.1117/12.2503536
Event: International Symposium on Optoelectronic Technology and Application 2018, 2018, Beijing, China

Abstract

1018nm Short wavelength Yb3+-doped fiber laser can be widely used for tandem-pumped fiber laser system in 1 μm regime because of its high brightness, high beam quality and low quantum defect (QD). In order to achieve 1018nm short wavelength Yb3+-doped fiber laser or amplifier with high output power and high beam quality, a steady-state rate equations model considering the mode competition, bend loss has been established. We theoretically analyzed the mode competition in 1018nm short wavelength Yb3+-doped fiber laser and amplifier and the simulation results show that the when the bend radius is 5cm, the LP01 mode output power is higher than the other mode power in the fiber laser and amplifier. When the bend radius is larger than 5cm, the beam quality will decrease in fiber laser and amplifier especially for fiber laser, besides we calculated the mode power in the fiber amplifier at different power of seed laser, when the LP01 mode power is higher than the other, the beam quality will increase. At last we analyzed the evolution of transverse gain of every mode along the radial coordinate in fiber laser and amplifier. Our results can provide instructive suggestions when designing bend radius and the power of seed laser based fiber laser and amplifiers and can help to enhance the beam quality.

Citation Download Citation

Zhaoxin Xie, Wei Shi, Shijie Fu, and Jianquan Yao "Theoretical investigation of mode competition in high-power fiber lasers and amplifiers at 1018nm", Proc. SPIE 10844, Advanced Laser Technology and Applications, 1084406 (12 December 2018); https://doi.org/10.1117/12.2503536

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