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Generation of a 481-W Single Frequency and Linearly Polarized Beam by Coherent Polarization Locking

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6 Author(s)
Pengfei Ma ; Coll. of Optoelectron. Sci. & Eng., Nat. Univ. of Defense Technol., Changsha, China ; Pu Zhou ; Hu Xiao ; Yanxing Ma
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We demonstrate active coherent polarization locking of two high power polarization-maintained fiber amplifiers using single frequency dithering technique. When the active phasing system is in the closed loop, a 481-W single frequency and polarization-maintained laser beam with near-diffraction-limited beam quality is generated in the circumstance of imbalanced power ratio of the two amplifiers. The beam quality ( M2 factor) of the coherently polarization locked beam is measured to be and the polarization extinction ratio of the phasing beam can be as high as 10 dB (91%).

Published in:

Photonics Technology Letters, IEEE  (Volume:25 ,  Issue: 19 )