SBS suppression in high brightness, all-fiberized and linearly polarized amplifiers by rectangular spectrum

Stimulated Brillouin scattering (SBS) suppression in high power, narrow linewidth and all polarization-maintained amplifiers with near diffraction limited (NDL) beam quality by rectangular optical spectrum is demonstrated. Rectangular spectrum is generated by using cascaded phase modulations. In the preliminary experiment, output power of 509 W with spectral linewidth of ~ 3 GHz is obtained. At maximal output power, the polarization extinction ratio (PER) is measured to be ~ 14 dB and the beam quality (M2 factor) is M2 ~1.2. The technique presented give useful reference to control the spectral linewidth in high brightness fiber amplifiers. By combining with other linewidth controlling techniques, several kilowatt-level output power with spectral linewidth of < 10 GHz could be expected.

[1]  Bing He,et al.  302 W triple-frequency, single-mode, linearly polarized Yb-doped all-fiber amplifier , 2017, High Power Laser Science and Engineering.

[2]  Johan Nilsson,et al.  Optimization of phase modulation with arbitrary waveform generators for optical spectral control and suppression of stimulated Brillouin scattering. , 2015, Optics express.

[3]  Pengfei Ma,et al.  High-power coherent beam polarization combination of fiber lasers: progress and prospect [Invited] , 2017 .

[4]  Zhongmin Yang,et al.  400 mW ultrashort cavity low-noise single-frequency Yb³⁺-doped phosphate fiber laser. , 2011, Optics letters.

[5]  Ryan Stafford,et al.  Low threshold, singly-resonant CW OPO pumped by an all-fiber pump source. , 2006, Optics express.

[6]  N. Naderi,et al.  Beam combinable, kilowatt, all-fiber amplifier based on phase-modulated laser gain competition. , 2016, Optics letters.

[7]  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.

[8]  David Jones,et al.  High power , 1994, Nature.

[9]  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.

[10]  Cesar Jauregui,et al.  Average power limit of fiber-laser systems with nearly diffraction-limited beam quality , 2016, LASE.

[11]  A. B. Ruffin,et al.  Brillouin gain analysis for fibers with different refractive indices. , 2005, Optics letters.

[12]  Iyad Dajani,et al.  Modal instability-suppressing, single-frequency photonic crystal fiber amplifier with 811 W output power. , 2014, Optics letters.

[13]  Pengfei Ma,et al.  414  W near-diffraction-limited all-fiberized single-frequency polarization-maintained fiber amplifier. , 2017, Optics letters.

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

[15]  T. Fan.  Laser beam combining for high-power, high-radiance sources , 2005, IEEE Journal of Selected Topics in Quantum Electronics.

[16]  Iyad Dajani,et al.  Pseudo-random binary sequence phase modulation for narrow linewidth, kilowatt, monolithic fiber amplifiers. , 2014, Optics express.

[17]  Iyad Dajani,et al.  High power, sub-GHz, monolithic fiber amplifier based on phase modulated laser gain competition , 2014, 2014 Conference on Lasers and Electro-Optics (CLEO) - Laser Science to Photonic Applications.

[18]  W. Marsden.  I and J , 2012 .

[19]  C Bogan,et al.  Stabilized high-power laser system for the gravitational wave detector advanced LIGO. , 2012, Optics express.

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

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