Analysis of beam quality for the laser beams after spectral beam combining |
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| Authors: | Yan Zhang Bin Zhang |
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| Institution: | a School of Optoelectronic Information, University of Electronic Science Technology of China, ChengDu 610054, China
b College of Electronics Information, Sichuan University, ChengDu 610064, China |
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| Abstract: | The beam quality of the laser beams after spectral beam combining (SBC) has been analyzed in this paper. Based on the propagation model of the spectral beam combining system, the expression for the output field of an individual beam passing through the spectral beam combining system with lens aberration has been given and the intensity distribution of the combined beam has been studied by the principle of incoherent superposition. Consequently, according to the intensity second-order moments method, the M2-factor of the combined beam has been calculated and the effect of lens aberration on the characteristics of the combined beam has been analyzed quantitatively. It can be shown that the SBC system can improve the beam quality of laser array significantly, and the M2-factor of the combined beam passing through the ideal spectral beam combining system is almost the same as that of an individual beam. For the spectral beam combining system with lens aberration, the spherical aberration has greater effect on the off-axis beam than on the on-axis beam, and the beam quality of combined beam degrades with increase in lens aberration. |
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| Keywords: | Spectral beam combining (SBC) Beam quality Laser array Aberration Diffraction integral |
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