A simple O-shaped cylinder fiber laser without inter-cladding-power-strippers

We proposed a simple O-shaped cylinder all-fiber-integrated laser without inter-cladding-power-strippers (CPS) based on a quasi-bidirectional pumping scheme. The fiber grooves were inscribed on the outside of an O-shaped aluminium cylinder with both straight and curved tracks. The curved track with a diameter of 10 cm could suppress the high order modes and keep a stable beam quality with the increases of output power, while the straight parts improve the robustness for fusion points and unpackaged optical components. The simplified configuration of no CPS between the oscillator and the amplifier could also improve the total efficiency. The output power, the optical-to-optical efficiency, the beam quality, and the Raman suppression are systematically investigated. It is verified that this design introduces a practical way to simultaneously improve the transverse mode instability (TMI) and SRS thresholds in a high-power fiber laser system with a simple configuration and high efficiency.

[1]  Pengfei Ma,et al.  2.43 kW narrow linewidth linearly polarized all-fiber amplifier based on mode instability suppression , 2017 .

[2]  Jian-jun Wang,et al.  SRS suppression in multi-kW fiber lasers with a multiplexed CTFBG. , 2021, Optics express.

[3]  Qihao Hu,et al.  Influence of Bragg reflection of chirped tilted fiber Bragg grating on Raman suppression in high-power tandem pumping fiber amplifiers. , 2020, Optics express.

[4]  Pu Zhou,et al.  Experimental Study of Output Characteristics of Bi-Directional Pumping High Power Fiber Amplifier in Different Pumping Schemes , 2017, IEEE Photonics Journal.

[5]  Arlee V Smith,et al.  Steady-periodic method for modeling mode instability in fiber amplifiers. , 2013, Optics express.

[6]  J. Nilsson,et al.  High power fiber lasers , 2010, CLEO/QELS: 2010 Laser Science to Photonic Applications.

[7]  M. Zervas,et al.  High Power Fiber Lasers: A Review , 2014, IEEE Journal of Selected Topics in Quantum Electronics.

[8]  Y. Wang,et al.  The influence of fusion splicing on the beam quality of a ytterbium-doped fiber laser , 2013 .

[9]  M. Morin,et al.  SRS modeling in high power CW fiber lasers for component optimization , 2017, LASE.

[10]  Arlee V. Smith,et al.  Influence of pump and seed modulation on the mode instability thresholds of fiber amplifiers. , 2012, Optics express.

[11]  Pengfei Ma,et al.  1.3 kW monolithic linearly polarized single-mode master oscillator power amplifier and strategies for mitigating mode instabilities , 2015 .

[12]  Jens Kobelke,et al.  Very large mode area ytterbium fiber amplifier with aluminum-doped pump cladding made by powder sinter technology , 2014 .

[13]  F. Jansen,et al.  Mitigation strategies for mode instabilities in high-power fiber-laser systems , 2013 .

[14]  Cesar Jauregui,et al.  Controlling mode instabilities by dynamic mode excitation with an acousto-optic deflector. , 2013, Optics express.

[15]  W. Clarkson.  High power fibre lasers , 2002 .

[16]  R. Zhu,et al.  Suppressing stimulated Raman scattering in kW-level continuous-wave MOPA fiber laser based on long-period fiber gratings. , 2020, Optics express.

[17]  Arlee V. Smith,et al.  Increasing mode instability thresholds of fiber amplifiers by gain saturation. , 2013, Optics express.

[18]  Pengfei Ma,et al.  Suppressing mode instabilities by optimizing the fiber coiling methods , 2017 .

[19]  L. Xu,et al.  3.7 kW monolithic narrow linewidth single mode fiber laser through simultaneously suppressing nonlinear effects and mode instability. , 2019, Optics express.