1.8-kW simultaneous spectral and coherent combining of three-tone nine-channel all-fiber amplifier array

We demonstrate simultaneous spectral and coherent combining of a three-tone nine-channel all-fiber amplifier array with a total output power of 1.8 kW in a master-oscillator power-amplifier (MOPA) configuration. Three single-frequency seed lasers are spectrally combined and employed as a master oscillator for an all-fiber power amplifier array, which provides robust performance on suppressing of the stimulated Brillouin scattering effect. Three-stage power amplifiers are employed to scale the power from tens of mW to more than 300 W. Active phase locking of the nine-channel spectrally combined amplifiers is implemented by using the stochastic parallel gradient descent algorithm. In the experiment, a nine-channel spectrally combined MOPA array is coherently combined with a total output power of 1.8 kW. The power in the main lobe in closed loop is 4.6 times the value in open loop, and an average visibility of more than 85 % of the interference pattern at the receiving plane is obtained. By only adding pump power in the main amplifiers, the total power of the array could scale up to more than 3 kW.

[1]  Thomas Kaiser,et al.  Complete modal decomposition for optical fibers using CGH-based correlation filters. , 2009, Optics express.

[2]  C Fallnich,et al.  Novel suppression scheme for Brillouin scattering. , 2004, Optics express.

[3]  J. Limpert,et al.  2 kW incoherent beam combining of four narrow-linewidth photonic crystal fiber amplifiers. , 2009, Optics express.

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

[5]  Pu Zhou,et al.  Coherent Beam Combining of Fiber Amplifiers Using Stochastic Parallel Gradient Descent Algorithm and Its Application , 2009, IEEE Journal of Selected Topics in Quantum Electronics.

[6]  A. B. Ruffin,et al.  502 Watt, single transverse mode, narrow linewidth, bidirectionally pumped Yb-doped fiber amplifier. , 2007, Optics express.

[7]  Michal Lipson,et al.  Ultrasmall mode volumes in dielectric optical microcavities. , 2005, Physical review letters.

[8]  Govind P. Agrawal,et al.  Nonlinear Fiber Optics , 1989 .

[9]  Wei Zhao,et al.  High-Power Coherent Beam Combining of Two Photonic Crystal Fiber Lasers , 2008, IEEE Photonics Technology Letters.

[10]  Y. Jaouen,et al.  Beam Shaping of Single-Mode and Multimode Fiber Amplifier Arrays for Propagation Through Atmospheric Turbulence , 2009, IEEE Journal of Selected Topics in Quantum Electronics.

[11]  Y. Lim,et al.  Coherent polarization locking with near-perfect combining efficiency. , 2006, Optics letters.

[12]  Clint Zeringue,et al.  Pump-limited, 203 W, single-frequency monolithic fiber amplifier based on laser gain competition. , 2011, Optics letters.

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

[14]  Anping Liu.  Suppressing stimulated Brillouin scattering in fiber amplifiers using nonuniform fiber and temperature gradient. , 2007, Optics express.

[15]  Zhifang Wu,et al.  A Novel Method for Heightening Sensitivity of Prism Coupler-Based SPR Sensor , 2011 .

[16]  Joshua E. Rothenberg,et al.  Active phase and polarization locking of a 1.4 kW fiber amplifier. , 2010, Optics letters.

[17]  Zejin Liu,et al.  Simultaneous spectrum and coherent combining by active phasing dual two-tone all-fiber MOPA chains. , 2011, Optics letters.

[18]  T. Weyrauch,et al.  Adaptive Array of Phase-Locked Fiber Collimators: Analysis and Experimental Demonstration , 2009, IEEE Journal of Selected Topics in Quantum Electronics.

[19]  C. Zeringue,et al.  Investigation of Nonlinear Effects in Multitone-Driven Narrow-Linewidth High-Power Amplifiers , 2009, IEEE Journal of Selected Topics in Quantum Electronics.

[20]  O. Shapira,et al.  Complete modal decomposition for optical waveguides , 2005, (CLEO). Conference on Lasers and Electro-Optics, 2005..

[21]  Cesar Jauregui,et al.  High-speed modal decomposition of mode instabilities in high-power fiber lasers. , 2011, Optics letters.

[22]  Christopher J. Corcoran,et al.  Experimental demonstration of a phase-locked laser array using a self-Fourier cavity , 2005 .