>1  kW all-fiberized narrow-linewidth polarization-maintained fiber amplifiers with wavelength spanning from 1065 to 1090  nm.

We demonstrate all-fiberized, kilowatt-level, narrow-linewidth, Yb-doped and polarization-maintained (PM) amplifiers with a central wavelength spanning from 1065 to 1090 nm. The laser system consists of a tunable single-frequency laser seed and multistage PM fiber amplifiers in the master oscillator power amplifier configuration. The stimulated Brillouin scattering effect is suppressed by phase modulation based on a white noise source. The linewidth (Δλ∼0.12  nm at 1 kW), polarization extinction ratio (PER>13  dB) and beam quality (M2∼1.2) are well maintained during the power scaling process, and the slope efficiency of this system is 70.8%.

[1]  N. A. Brilliant,et al.  Thermal effects in a dual-clad ytterbium fiber laser. , 2001, Optics letters.

[2]  Sergey A Babin,et al.  Tunable CW all-fiber optical parametric oscillator operating below 1 μm. , 2013, Optics express.

[3]  Pan Fu,et al.  An Efficient Single-Frequency Yb-Doped All-Fiber MOPA Laser at 1064.3 nm* , 2016 .

[4]  Eric Honea,et al.  Threshold power and fiber degradation induced modal instabilities in high-power fiber amplifiers based on large mode area fibers , 2014, Photonics West - Lasers and Applications in Science and Engineering.

[5]  Kazuhide Nakajima,et al.  Evaluation methods and requirements for the stimulated Brillouin scattering threshold in a single-mode fiber , 2008 .

[6]  D. Kracht,et al.  All-Fiber Counter-Propagation Pumped Single Frequency Amplifier Stage With 300-W Output Power , 2012, IEEE Photonics Technology Letters.

[7]  D. Hanna,et al.  Ytterbium-doped fiber amplifiers , 1997 .

[8]  I. Kelson,et al.  Strongly pumped fiber lasers , 1998 .

[9]  Iyad Dajani,et al.  Experimental study of SBS suppression via white noise phase modulation , 2014, Photonics West - Lasers and Applications in Science and Engineering.

[10]  Pengfei Ma,et al.  293 W, GHz narrow-linewidth, polarization maintaining nanosecond fiber amplifier with SBS suppression employing simultaneous phase and intensity modulation. , 2015, Optics express.

[11]  Wei Shi,et al.  2 kW narrow spectral width monolithic continuous wave in a near-diffraction-limited fiber laser. , 2015, Applied optics.

[12]  Pengfei Ma,et al.  1.89 kW all-fiberized and polarization-maintained amplifiers with narrow linewidth and near-diffraction-limited beam quality. , 2016, Optics express.

[13]  Bing He,et al.  10.8 kW spectral beam combination of eight all-fiber superfluorescent sources and their dispersion compensation. , 2016, Optics express.

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

[15]  A. B. Ruffin,et al.  Design concept for optical fibers with enhanced SBS threshold. , 2005, Optics express.

[16]  Iyad Dajani,et al.  Multi-kilowatt power scaling and coherent beam combining of narrow-linewidth fiber lasers , 2016, LASE.

[17]  Nikolai Platonov,et al.  >1.5kW narrow linewidth CW diffraction-limited fiber amplifier with 40nm bandwidth , 2016, LASE.

[18]  Ritwick Das,et al.  Yb-fiber laser pumped high-power, broadly tunable, single-frequency red source based on a singly resonant optical parametric oscillator. , 2016, Optics letters.

[19]  Can Li,et al.  A Broad Continuous Temperature Tunable DBR Single-Frequency Fiber Laser at 1064 nm , 2016, IEEE Photonics Journal.

[20]  D. V. Murphy,et al.  Coherent combining of a 4 kW, eight-element fiber amplifier array. , 2011, Optics letters.

[21]  Victor Khitrov,et al.  kW level narrow linewidth Yb fiber amplifiers for beam combining , 2010, Defense + Commercial Sensing.

[22]  Oleg Shatrovoy,et al.  Diode-pumped narrow linewidth multi-kilowatt metalized Yb fiber amplifier. , 2016, Optics letters.

[23]  Cesar Jauregui,et al.  High-power fibre lasers , 2013 .

[24]  Pankaj Kadwani,et al.  High average power quasi-CW single-mode green and UV fiber lasers , 2015, Photonics West - Lasers and Applications in Science and Engineering.

[25]  Y. Jeong,et al.  Power Scaling of Single-Frequency Ytterbium-Doped Fiber Master-Oscillator Power-Amplifier Sources up to 500 W , 2007, IEEE Journal of Selected Topics in Quantum Electronics.

[26]  Jens Limpert,et al.  High average power spectral beam combining of four fiber amplifiers to 8.2 kW. , 2011, Optics letters.

[27]  S.A. Babin,et al.  All-fiber widely tunable Raman fiber laser with controlled output spectrum , 2007, 2007 European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference.

[28]  A Silva,et al.  Wavelength-swept Yb-fiber master-oscillator-power-amplifier with 70 nm rapid tuning range. , 2011, Optics express.

[29]  R. Beach,et al.  Analysis of the scalability of diffraction-limited fiber lasers and amplifiers to high average power. , 2008, Optics express.

[30]  A. Hardy,et al.  Optimization of strongly pumped fiber lasers , 1999 .