Coherent Polarization Beam Combining of Four High-Power Fiber Amplifiers Using Single-Frequency Dithering Technique

We demonstrate a coherent polarization beam combining (CPBC) of four all polarization-maintained high-power fiber amplifiers with a total output power of 60 W, using the single-frequency dithering technique. When the control system is in the closed loop, the intensity profile is steady and the phase noise can be suppressed effectively. The experimental results show that the combining efficiency of the whole system is as high as 90% in the circumstance of imbalance power ratios of the four beams. The technique used in this letter can be straightforwardly scaled to CPBC of a large array of high-power fiber amplifiers.

[1]  Chunte A. Lu,et al.  First experimental demonstration of self-synchronous phase locking of an optical array. , 2006, Optics express.

[2]  Pu Zhou,et al.  Coherent beam combination of 1.08 kW fiber amplifier array using single frequency dithering technique. , 2011, Optics letters.

[3]  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.

[4]  C. X. Yu,et al.  Beam control of a 2D polarization maintaining fiber optic phased array with high-fiber count , 2006, SPIE Optics + Photonics.

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

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

[8]  Andrew Bratcher,et al.  Power scaling of a fiber master oscillator power amplifier system using a coherent polarization beam combination. , 2010, Applied optics.

[9]  Eric Mies,et al.  All-fiber 50 W coherently combined passive laser array. , 2009, Optics letters.

[10]  Andrew Bratcher,et al.  Coherent Polarization Beam Combination , 2010, IEEE Journal of Quantum Electronics.

[11]  Tso Yee Fan,et al.  Beam combining of ytterbium fiber amplifiers (Invited) , 2007 .

[12]  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.

[13]  Mikhail A Vorontsov,et al.  Laser beam projection with adaptive array of fiber collimators. I. Basic considerations for analysis. , 2008, Journal of the Optical Society of America. A, Optics, image science, and vision.

[14]  A M Scott,et al.  Phase stabilization of a large-mode-area ytterbium-doped fiber amplifier. , 2007, Optics letters.

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

[16]  R. Simpson,et al.  Brightness-Scaling Potential of Actively Phase-Locked Solid-State Laser Arrays , 2007, IEEE Journal of Selected Topics in Quantum Electronics.

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

[18]  Joshua E. Rothenberg,et al.  Perturbative analysis of coherent combining efficiency with mismatched lasers. , 2010, Optics express.