Abstract

A novel fiber laser called an oscillating–amplifying integrated fiber laser was studied experimentally, in which the oscillating section and amplifying section share the pump between them. Based on this configuration, a 5-kW fiber laser system with optical–optical efficiency of 80.9% and ${{ M}^2}$ factor of 1.5 was achieved. The startup and shutdown sequence of the laser was studied in detail. When pumps of the laser were deliberately turned on in an inverted order, such as switching on/off the amplifying section before/after the oscillating section, which is normally disastrous in a classic fiber amplifier, the laser system turned out to operate stably at full power level. Thus, it is verified that there is no priority between the amplifier and the seed in this laser system. It combines the advantages of conventional fiber oscillators and fiber amplifiers, including high efficiency, high reliability, good anti-backreflection, and simple control logic.

© 2021 Optica Publishing Group

5 kW monolithic fiber amplifier employing homemade spindle-shaped ytterbium-doped fiber

Lingfa Zeng, Zhiyong Pan, Xiaoming Xi, Huan Yang, Yun Ye, Liangjin Huang, Hanwei Zhang, Xiaolin Wang, Zefeng Wang, Pu Zhou, Xiaojun Xu, and Jinbao Chen
Opt. Lett. 46(6) 1393-1396 (2021)

4.6 kW linearly polarized and narrow-linewidth monolithic fiber amplifier based on a fiber oscillator laser seed

Shibiao Liao, Tao Luo, Runheng Xiao, Chang Shu, Junjie Cheng, Zhilun Zhang, Yingbin Xing, Haiqing Li, Nengli Dai, and Jinyan Li
Opt. Lett. 48(24) 6533-6536 (2023)

Demonstration of 3kW × 2 ports bidirectional output oscillating-amplifying integrated fiber laser employing chirped and tilted fiber Bragg gratings for co-SRS suppression

Jiaqi Liu, Lingfa Zeng, Peng Wang, Hanshuo Wu, Xiaoming Xi, Chen Shi, Hanwei Zhang, Xiaolin Wang, Yu Ning, and Fengjie Xi
Opt. Express 31(17) 28400-28412 (2023)

kW-level monolithic single-mode narrow-linewidth all-solid photonic bandgap fiber amplifier

Benjamin Pulford, Roger Holten, Turghun Matniyaz, Monica T. Kalichevsky-Dong, Thomas W. Hawkins, and Liang Dong
Opt. Lett. 46(18) 4458-4461 (2021)

Near-single-mode 3 kW monolithic fiber oscillator based on a longitudinally spindle-shaped Yb-doped fiber

Lingfa Zeng, Xiaoming Xi, Yun Ye, Hanwei Zhang, Xiaolin Wang, Zhiyong Pan, Zefeng Wang, and Xiaojun Xu
Opt. Lett. 45(20) 5792-5795 (2020)