| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Optimal Truncation of Element Beam in a Coherent Fiber Laser Array |
| ZHOU Pu, WANG Xiao-Lin, MA Yan-Xing, MA Hao-Tong, LIU Ze-Jin, XU Xiao-Jun |
| College of Optic-electric Science and Engineering, National University of Defense Technology, Changsha 410073 |
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| Cite this article: |
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ZHOU Pu, WANG Xiao-Lin, MA Yan-Xing et al 2009 Chin. Phys. Lett. 26 044206 |
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Abstract The beam quality of a coherent fiber laser array often suffers from the low fill factor of the Gaussian laser array. One simple and effective approach to improve the fill factor is to truncate the array element properly. An analytical expression for far-field intensity distribution of a truncated coherent fiber laser array is derived. Optimal truncation of the element beam in different coherent fiber laser arrays is obtained by using energy encircled in the far-field central-lobe as the beam quality criterion. By optimal truncation, energy encircled in the central-lobe can be 97% compared with the ideal case. The shift in optimal truncation parameter in the case of phase noise is also
analyzed.
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| Keywords:
42.60.Da
42.30.Kq
42.60.Jf
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Received: 14 October 2008
Published: 25 March 2009
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