J4 ›› 2009, Vol. 26 ›› Issue (4): 417-420.

• Laser Tech. and Devices • Previous Articles     Next Articles

Analysis of far-field characteristics of spatial coherent beam combining fiber lasers

GAO Kun1 , XU Li-Xin1 , WANG An-Ting1 , MING Hai1 , LIU Yang2 , WANG Xiao-Bing2 , CHENG Yong2    

  1. 1 Department of Physics, University of Science and Technology of China, Hefei 230026, China; 
    2 Institute of Optoelectronics, Wuhan Ordnance Non-Commissioned Officers Academy, Wuhan 430075, China
  • Received:2008-09-23 Revised:2008-11-12 Published:2009-07-28 Online:2009-06-29

Abstract:

We simulate numerically the far-field intensity distribution of 6 circular arranged coherent fiber lasers and estimate its power convergence based on Fraunhofer diffraction theory. The results show that the intensity distribution at far-field is equivalent to the product of a Gaussian envelop and the interference distribution of several planar waves. When the diameter of the arranging circle is less than 5 times of the radius of a unit laser, over 90% of the power will drop into the 86.5% power circle of the unit laser. The calculation leads to the conclusion that power convergence of the combined beam can be optimized by adjusting the arrangement, where the convergence can even exceed that of a single unit laser beam.

Key words: laser techniques, coherent beam combining, scalar diffraction theory, power convergence, beam quality

CLC Number: